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Showing 1 - 200 of 3175 Journals sorted alphabetically
A Practical Logic of Cognitive Systems     Full-text available via subscription   (Followers: 9)
AASRI Procedia     Open Access   (Followers: 14)
Academic Pediatrics     Hybrid Journal   (Followers: 30, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 22, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 87, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 25, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 35, SJR: 2.515, h-index: 90)
Achievements in the Life Sciences     Open Access   (Followers: 5)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 6, SJR: 0.338, h-index: 19)
Acta Astronautica     Hybrid Journal   (Followers: 387, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Biomaterialia     Hybrid Journal   (Followers: 27, SJR: 2.02, h-index: 104)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription   (Followers: 2)
Acta de Investigación Psicológica     Open Access   (Followers: 3)
Acta Ecologica Sinica     Open Access   (Followers: 8, SJR: 0.172, h-index: 29)
Acta Haematologica Polonica     Free   (Followers: 1, SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 242, SJR: 3.683, h-index: 202)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.615, h-index: 21)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.442, h-index: 21)
Acta Oecologica     Hybrid Journal   (Followers: 10, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription  
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 2, SJR: 0.311, h-index: 16)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 1)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 25, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 3)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 2)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 3, SJR: 0.383, h-index: 19)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 1)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 6, SJR: 0.141, h-index: 3)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 3, SJR: 0.112, h-index: 2)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 6)
Acute Pain     Full-text available via subscription   (Followers: 14)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.967, h-index: 57)
Addictive Behaviors     Hybrid Journal   (Followers: 15, SJR: 1.514, h-index: 92)
Addictive Behaviors Reports     Open Access   (Followers: 7)
Additive Manufacturing     Hybrid Journal   (Followers: 9, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 22)
Advanced Cement Based Materials     Full-text available via subscription   (Followers: 3)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 136, SJR: 5.2, h-index: 222)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.265, h-index: 53)
Advanced Powder Technology     Hybrid Journal   (Followers: 16, SJR: 0.739, h-index: 33)
Advances in Accounting     Hybrid Journal   (Followers: 8, SJR: 0.299, h-index: 15)
Advances in Agronomy     Full-text available via subscription   (Followers: 12, SJR: 2.071, h-index: 82)
Advances in Anesthesia     Full-text available via subscription   (Followers: 27, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 2)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 10, SJR: 1.054, h-index: 35)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 10, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 22, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 14, SJR: 3.31, h-index: 42)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.277, h-index: 43)
Advances in Botanical Research     Full-text available via subscription   (Followers: 2, SJR: 0.619, h-index: 48)
Advances in Cancer Research     Full-text available via subscription   (Followers: 29, SJR: 2.215, h-index: 78)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 7, SJR: 0.9, h-index: 30)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 2.139, h-index: 42)
Advances in Cell Aging and Gerontology     Full-text available via subscription   (Followers: 3)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 27, SJR: 0.183, h-index: 23)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.665, h-index: 29)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 10, SJR: 1.268, h-index: 45)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 28, SJR: 0.938, h-index: 33)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19, SJR: 2.314, h-index: 130)
Advances in Computers     Full-text available via subscription   (Followers: 14, SJR: 0.223, h-index: 22)
Advances in Dermatology     Full-text available via subscription   (Followers: 15)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 8)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 21)
Advances in Ecological Research     Full-text available via subscription   (Followers: 42, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 27, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 43, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 1)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 53, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Genetics     Full-text available via subscription   (Followers: 15, SJR: 2.558, h-index: 54)
Advances in Genome Biology     Full-text available via subscription   (Followers: 8)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 2.325, h-index: 20)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 0.497, h-index: 31)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.396, h-index: 27)
Advances in Immunology     Full-text available via subscription   (Followers: 36, SJR: 4.152, h-index: 85)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 1.132, h-index: 42)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 2, SJR: 1.274, h-index: 27)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 6)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 3)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 1)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Marine Biology     Full-text available via subscription   (Followers: 15, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 11, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 6, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 21)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 8)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.324, h-index: 8)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 3)
Advances in Oncobiology     Full-text available via subscription   (Followers: 1)
Advances in Organ Biology     Full-text available via subscription   (Followers: 1)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15, SJR: 2.885, h-index: 45)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 6, SJR: 0.148, h-index: 11)
Advances in Parasitology     Full-text available via subscription   (Followers: 5, SJR: 2.37, h-index: 73)
Advances in Pediatrics     Full-text available via subscription   (Followers: 24, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 10)
Advances in Pharmacology     Full-text available via subscription   (Followers: 15, SJR: 1.718, h-index: 58)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 7)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 59)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 3, SJR: 0.1, h-index: 2)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 5)
Advances in Space Research     Full-text available via subscription   (Followers: 385, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 5)
Advances in Surgery     Full-text available via subscription   (Followers: 9, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 29, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 17)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 46, SJR: 2.408, h-index: 94)
Aeolian Research     Hybrid Journal   (Followers: 6, SJR: 0.973, h-index: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 336, SJR: 0.816, h-index: 49)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.318, h-index: 36)
African J. of Emergency Medicine     Open Access   (Followers: 6, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 10, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 438, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 31, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 43, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access   (Followers: 1)
Agriculture and Natural Resources     Open Access   (Followers: 2)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 56, SJR: 1.879, h-index: 120)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.434, h-index: 14)
Air Medical J.     Hybrid Journal   (Followers: 6, SJR: 0.234, h-index: 18)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.285, h-index: 3)
Alcohol     Hybrid Journal   (Followers: 11, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 9)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.436, h-index: 12)
Alexandria J. of Medicine     Open Access   (Followers: 1)
Algal Research     Partially Free   (Followers: 9, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.46, h-index: 29)
Allergology Intl.     Open Access   (Followers: 5, SJR: 0.776, h-index: 35)
Alpha Omegan     Full-text available via subscription   (SJR: 0.121, h-index: 9)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 9, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 48, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 4)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 4)
Ambulatory Pediatrics     Hybrid Journal   (Followers: 6)
American Heart J.     Hybrid Journal   (Followers: 50, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 51, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 44, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 10, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 14, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 31, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 26, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 34, SJR: 2.313, h-index: 172)
American J. of Medicine     Hybrid Journal   (Followers: 42, SJR: 2.023, h-index: 189)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 197, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 62, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 6)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 25, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 27, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 27, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 37, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.653, h-index: 70)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 6)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 62, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 14)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 3, SJR: 0.209, h-index: 27)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription   (SJR: 0.104, h-index: 3)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 4, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 39, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 171, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 10, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 11)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 1)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 22, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access   (Followers: 1)

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Journal Cover Limnologica - Ecology and Management of Inland Waters
  [SJR: 0.668]   [H-I: 32]   [4 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0075-9511
   Published by Elsevier Homepage  [3175 journals]
  • Comparison of two water sampling approaches for eDNA-based crayfish plague
    • Authors: Claudia Wittwer; Carsten Nowak; David Allan Strand; Trude Vrålstad; Marco Thines; Stefan Stoll
      Pages: 1 - 9
      Abstract: Publication date: May 2018
      Source:Limnologica, Volume 70
      Author(s): Claudia Wittwer, Carsten Nowak, David Allan Strand, Trude Vrålstad, Marco Thines, Stefan Stoll
      The crayfish plague agent Aphanomyces astaci causes high fatality rates among European crayfish species and is transmitted by semi-immune North American crayfish species via zoospores. Recently environmental DNA (eDNA) techniques have been developed to detect the pathogen directly in water samples. To identify the optimal technique for concentrating spores out of water samples we tested two water filtration methods, namely depth filtration (DF) and dead-end ultrafiltration (DEUF), with subsequent qPCR-based detection of A. astaci spores from the water column in three river systems in Germany. Both eDNA methods were successful in recovering and detecting A. astaci spores from all three lotic water systems and the detection patterns were generally consistent across watercourse and season. Water turbidity negatively affected the A. astaci spore detection with both eDNA methods, with increasing pellet weights for the DEUF method and decreasing water volumes for the DF samples. Although filtering high-volume water samples with the DEUF method led to slightly higher detection rates of A. astaci and seemed to be more sensitive in A. astaci detection, its application is highly laborious and more costly. We therefore propose to use the DF method for large-scale screenings of A. astaci in running waters due to its fast, cost-effective and easy-to-apply sample processing and the very robust quantification results. We are confident that this method might be favored as well for eDNA studies of other organisms.

      PubDate: 2018-04-15T08:06:20Z
      DOI: 10.1016/j.limno.2018.03.001
      Issue No: Vol. 70 (2018)
  • Contrasting patterns of macroinvertebrates inshore vs. offshore in a
           plateau eutrophic lake: Implications for lake management
    • Authors: Shuran Cindy Wang; Xueqin Liu; Yong Liu; Hongzhu Wang
      Pages: 10 - 19
      Abstract: Publication date: May 2018
      Source:Limnologica, Volume 70
      Author(s): Shuran Cindy Wang, Xueqin Liu, Yong Liu, Hongzhu Wang
      Worldwide there has been deterioration of lakeshore habitat and increasing eutrophication. These stresses have impacted littoral macroinvertebrate communities. However, bioassessment and rehabilitation have been largely carried out offshore, and the inshore macroinvertebrates have received less attention especially in shallow plateau lakes. In this study, we compared inshore and offshore macroinvertebrate communities in a shallow plateau lake, Lake Dianchi, China. The environmental parameters determining the distribution of macroinvertebrates were analyzed with partial redundancy analysis. Our results showed that macroinvertebrate communities differed significantly between inshore and offshore. Taxonomic richness was much higher inshore than offshore, due to higher habitat heterogeneity. By contrast, both density and biomass inshore were significantly lower than those of offshore. Generally, vegetation and substrate type were the key environmental parameters shaping macroinvertebrate communities. Eutrophication exerted great effect on offshore communities, while its impacts on inshore communities varied spatially. Shoreline degradation and seasonal eutrophication effects resulted in the limited density and biomass of inshore communities. Our results emphasized the significance of inshore habitats for macroinvertebrates in Lake Dianchi, and provided important implications for bioassessment and ecological rehabilitation in shallow lakes.

      PubDate: 2018-04-15T08:06:20Z
      DOI: 10.1016/j.limno.2018.03.002
      Issue No: Vol. 70 (2018)
  • Diatom diversity at multiple scales in urban reservoirs in Southern Brazil
           reveals the likely role of trophic state
    • Authors: Raquel C. Marra; Vanessa M. Algarte; Thelma A.V. Ludwig; André A. Padial
      Pages: 49 - 57
      Abstract: Publication date: Available online 12 April 2018
      Author(s): Raquel C. Marra, Vanessa M. Algarte, Thelma A.V. Ludwig, André A. Padial
      Diatoms grow under very specific physical and chemical conditions, and eutrophication may cause community variation. We aimed to describe spatial and temporal variation in diatom community diversity in two urban reservoirs of different throphic status at different spatial scales. We collected samples of epiphytic diatoms from aquatic macrophytes from six sites in each reservoir in the metropolitan region of Curitiba, Southern Brazil, in fall and in spring. We assessed the variation in cell density and taxa richness (considering the lower taxonomic level possible) between the reservoirs and periods using t tests, and the differences in community composition using PERMANOVA. Principal coordinates analysis (PCoA) was used to observe the change in floras between reservoirs and periods. We also partitioned gamma diversity into alpha and beta diversities using Additive Partitioning. In this case, variation components at different spatial scales were generated for each period. Beta diversities at different scales were also divided into turnover and nestedness components. We identified 132 infrageneric taxa in each reservoir. Spatial and temporal variation in species diversity and composition occurred in both reservoirs at different scales. Even so variation between reservoirs is a component that cannot be expected by a null model, indicating a possible role of eutrophication in community variation. Community variation at different scales was higher in the more eutrophic reservoir, in line with the positive relationship between beta diversity and productivity. Turnover was always the main component of beta diversity considering all spatial and temporal community variation. Nestedness occurred particularly in community variation among time periods at a same location, in line with studies suggesting community stability in urban reservoirs. Taken together, our results highlight the key role of nutrient availability in determining species composition, community variation within reservoirs, and community variation over time.

      PubDate: 2018-04-15T08:06:20Z
      DOI: 10.1016/j.limno.2018.04.001
      Issue No: Vol. 70 (2018)
  • Effects of nutrients and organic matter inputs in the gases CO2 and O2: A
           mesocosm study in a tropical lake
    • Authors: Denise Tonetta; Peter Anton Staehr; Biel Obrador; Luciana Pena Mello Brandão; Ludmila Silva Brighenti; Mauricio Mello Petrucio; Francisco Antônio Rodrigues Barbosa; José Fernandes Bezerra-Neto
      Pages: 1 - 9
      Abstract: Publication date: March 2018
      Source:Limnologica, Volume 69
      Author(s): Denise Tonetta, Peter Anton Staehr, Biel Obrador, Luciana Pena Mello Brandão, Ludmila Silva Brighenti, Mauricio Mello Petrucio, Francisco Antônio Rodrigues Barbosa, José Fernandes Bezerra-Neto
      Lakes are important components in the carbon cycling and threatened by direct and indirect human activities, which ultimately affect metabolic processes. We analyzed the daily dynamics of the air-water CO2 and O2 fluxes over nine days in a mesocosm experiment to determine how the inputs of inorganic nutrients (+NUTRI) and allochthonous organic matter (+OM) affected the metabolic processes. The control, representing the original state of the lake, showed low coefficient of variability among the days sampled and a predominant FCO2 to the atmosphere, but with mean values close to zero (0.2 ± 0.3 mmol m−2 d−1). In +NUTRI and +NUTRI+OM treatments mesocosms, the FCO2 and FO2 showed similar response, where the FCO2 was negative during all days (mean −1.8 ± 1.1 and −1.9 ± 1.2 mmol m−2 d−1, respectively) and FO2 was initially negative, becoming positive after day 4, and decreasing again after day 6. The +OM treatment intensified the FCO2 to the atmosphere (mean 0.4 ± 0.9 mmol m−2 d−1) with highest values at day 7. The ecosystem in +NUTRI and +NUTRI+OM treatments showed a similar recovery (8 days), while +OM treatment mesocosm was similar to the control conditions. The models showed that nutrients promoted larger overall changes and higher daily variability in both FCO2 and FO2, leading to a CO2 influx, followed by organic matter addition. In conclusion, this mesocosm experiment showed the fast response of the lakes to even small disturbances (e.g organic matter addition), which can intensify the sink or the source of carbon to the atmosphere and change the role of the lakes in the global carbon cycling.

      PubDate: 2018-04-15T08:06:20Z
      DOI: 10.1016/j.limno.2018.02.001
      Issue No: Vol. 69 (2018)
  • Aquatic interfaces and linkages: An emerging topic of interdisciplinary
    • Authors: Michael Hupfer; Peter Engesgaard; Henning Jensen; Stefan Krause; Gunnar Nützmann
      Pages: 1 - 4
      Abstract: Publication date: January 2018
      Source:Limnologica, Volume 68
      Author(s): Michael Hupfer, Peter Engesgaard, Henning Jensen, Stefan Krause, Gunnar Nützmann

      PubDate: 2018-02-26T20:21:38Z
      DOI: 10.1016/j.limno.2017.12.002
      Issue No: Vol. 68 (2018)
  • Hydrological connectivity drives dissolved organic matter processing in an
           intermittent stream
    • Authors: Astrid Harjung; Francesc Sabater; Andrea Butturini
      Pages: 71 - 81
      Abstract: Publication date: January 2018
      Source:Limnologica, Volume 68
      Author(s): Astrid Harjung, Francesc Sabater, Andrea Butturini
      Hydrological conditions are key drivers of dissolved organic matter (DOM) processing in intermittent streams. However, there still exist major gaps in knowledge regarding the temporal dynamics of DOM processing during drought periods, as well as the role of the hyporheic zone (HZ). We conducted weekly sampling of surface water and hyporheic pore water during a drying/rewetting cycle and characterized DOM by fluorescence and absorbance properties. Overall, the contribution of allochthonous and humic-like DOM increased during base flow in early summer (pre-drought) and continued increasing throughout the drought period, which covered three phases: contraction, fragmentation and dry. The contribution of autochthonous DOM during this period was restricted to very specific points in time (the transition from contraction to fragmentation phase) and space (the HZ). Hydrological connectivity between the HZ and the surface water was a driver of DOM composition by supplying terrestrial, aromatic DOM to the HZ. The disconnection of the stream from the riparian groundwater enabled us to quantify the DOM retention/release in the HZ. DOM mass balance at the stream-hyporheic interface revealed the occurrence of two time periods with disproportionately high rates for DOM processing (hot moments) during the study period: (1) a short pulse of protein-like, autochthonous DOM net release at the beginning of the disconnection; and (2) a longer time period of increasing net dissolved organic carbon (DOC) retention up to 30% along 25m of HZ length during fragmentation and dry phase. Remarkably, the net carbon retention was coupled to a decrease of aromatic and high molecular weight compounds, while protein-like, autochthonous DOM was released. This result evidenced that under drought conditions, the HZ becomes a sink for DOM compounds previously assumed to be recalcitrant in aquatic ecosystems and therefore highlights the importance of hydrological drivers on DOM processing.
      Graphical abstract image Highlights

      PubDate: 2018-02-26T20:21:38Z
      DOI: 10.1016/j.limno.2017.02.007
      Issue No: Vol. 68 (2018)
  • Gradients of organic matter quality, mineralization and sequestration in
           Cook’s Bay of Lake Simcoe, Canada
    • Authors: Christian Blodau; Svenja Agethen; Tanja Broder; Klaus-Holger Knorr
      Pages: 92 - 104
      Abstract: Publication date: January 2018
      Source:Limnologica, Volume 68
      Author(s): Christian Blodau, Svenja Agethen, Tanja Broder, Klaus-Holger Knorr
      Carbon sequestration in lakes represents a globally relevant carbon sink. Important controls thereof are functions of lake morphometry and productivity, organic matter origin and quality, and organic and inorganic matter burial in sediments. To understand the relative importance of these controls, we investigated organic and inorganic carbon sequestration and burial efficiency by means of 210Pb dating of sediments and determination of in situ carbon sedimentation in elongated Cook’s Bay of Lake Simcoe, a large Canadian hard water lake. Spectroscopic and elemental analysis of dissolved and particulate organic matter suggest that along the studied transect the influence of the major tributary on the quality of settling organic particles and dissolved organic matter was significant only at the shallow inlet of the bay, which had generally autochthonous character. Also sediment incubations confirmed similar organic matter decomposability throughout the bay. Thus, organic matter quality played a minor role for organic carbon sequestration, which ranged from 2.5 to 46.7gm−2 yr−1 and was lower than organic carbon sedimentation of 34–96gm−2 yr−1. The organic carbon burial efficiency of 7.3-89% did not follow a progressing spatial pattern but was lower both at the shallow and deep end of the bay and significantly related to non-carbonate, inorganic sedimentation (R2 =0.97). The study suggests that in this lake system the influence of organic matter quality on C sequestration is limited, as well as temperature. However, sedimentation rate controls the duration of exposure to terminal electron acceptors and hence, C sequestration and organic carbon burial efficiency.

      PubDate: 2018-02-26T20:21:38Z
      DOI: 10.1016/j.limno.2017.04.005
      Issue No: Vol. 68 (2018)
  • Ecological effects from groundwater contaminated by volatile organic
           compounds on an urban stream’s benthic ecosystem
    • Authors: J.W. Roy; L. Grapentine; G. Bickerton
      Pages: 115 - 129
      Abstract: Publication date: January 2018
      Source:Limnologica, Volume 68
      Author(s): J.W. Roy, L. Grapentine, G. Bickerton
      While the discharge of groundwater contaminated with volatile organic compounds to surface waters is widely reported, assessments of its ecological threat are rare in the scientific literature, largely being restricted to comparisons of riparian groundwater concentrations to water quality guidelines for protecting aquatic life. Here we investigated potential negative impacts on the benthic community from overlapping petroleum hydrocarbon – chlorinated solvent plumes discharging to an urban stream using in-field ecological assessment methods (targeting both meio- and macrobenthos) over multiple scales. Several lines of evidence were suggestive of detrimental impacts from the plumes, including reduced total abundance and richness of benthic taxa, reduced or enhanced abundances of individual benthic taxa, and an altered benthic community structure. However, the findings were not conclusive, as the evaluation was complicated by substantial small-scale (<20m) spatial variation in concentrations of many other groundwater contaminants, making it difficult to determine reference areas (i.e., those with similar substrate and chemistry, but lacking exposure to plume compounds) and isolate impacts from a single factor. Furthermore, detections of the wastewater indicator acesulfame also demonstrated the issue of uncertain influences from unmeasured contaminants (e.g., pharmaceuticals). Some of the assessment methods showed greater promise than others (e.g., sampling along a gradient rather than having separate impacted and reference sites), which may provide guidance on future field applications. Overall, the study findings suggest a need for further inquiry into the most appropriate application of ecological and ecotoxicological assessment methods to groundwater-based contamination hazards.

      PubDate: 2018-02-26T20:21:38Z
      DOI: 10.1016/j.limno.2017.01.004
      Issue No: Vol. 68 (2018)
  • Relations between vegetation and water level in groundwater dependent
           terrestrial ecosystems (GWDTEs)
    • Authors: Ole Munch Johansen; Dagmar Kappel Andersen; Rasmus Ejrnæs; Morten Lauge Pedersen
      Pages: 130 - 141
      Abstract: Publication date: January 2018
      Source:Limnologica, Volume 68
      Author(s): Ole Munch Johansen, Dagmar Kappel Andersen, Rasmus Ejrnæs, Morten Lauge Pedersen
      Alkaline wetlands and fens are groundwater dependent, terrestrial ecosystems (GWDTEs) existing throughout the temperate zone. They contain a large number of protected and endangered plant species and their ecological status is threatened by insufficient groundwater quality and quantity. However, management and conservation of fens are constrained by limited knowledge on the relations between vegetation and measurable hydrological conditions. This study investigates the relations between vegetation and water level dynamics in groundwater dependent wetlands in Denmark. A total of 35 wetland sites across Denmark were included in the study. The sites represent a continuum of wetlands with respect to vegetation and hydrological conditions. Water level was measured continuously using pressure transducers at each site. Metrics expressing different hydrological characteristics, such as mean water level and low and high water level periods, were calculated based on the water level time series. A complete plant species list was recorded in plots covering 78.5m2 at each site. Community metrics such as total number of species and the number of bryophytes were generated from the species lists and Ellenberg Indicator scores of moisture, pH and nutrients were calculated for each site. The water level correlates with the number of typical fen species of vascular plants, whereas bryophytes are closer connected to the stable water level conditions provided by groundwater seepage. The water level variability is proved to be a significant limiting factor for species diversity in wetlands, which should be considered along with the fertility in order to access the habitat quality. The study provides new insight in the water level preferences for GWDTEs which is highly needed in the management and assessment of anthropogenic damage to these ecosystems.

      PubDate: 2018-02-26T20:21:38Z
      DOI: 10.1016/j.limno.2017.01.010
      Issue No: Vol. 68 (2018)
  • Shallow bedrock limits groundwater seepage-based headwater climate refugia
    • Authors: Martin A. Briggs; John W. Lane; Craig D. Snyder; Eric A. White; Zachary C. Johnson; David L. Nelms; Nathaniel P. Hitt
      Pages: 142 - 156
      Abstract: Publication date: January 2018
      Source:Limnologica, Volume 68
      Author(s): Martin A. Briggs, John W. Lane, Craig D. Snyder, Eric A. White, Zachary C. Johnson, David L. Nelms, Nathaniel P. Hitt
      Groundwater/surface-water exchanges in streams are inexorably linked to adjacent aquifer dynamics. As surface-water temperatures continue to increase with climate warming, refugia created by groundwater connectivity is expected to enable cold water fish species to survive. The shallow alluvial aquifers that source groundwater seepage to headwater streams, however, may also be sensitive to seasonal and long-term air temperature dynamics. Depth to bedrock can directly influence shallow aquifer flow and thermal sensitivity, but is typically ill-defined along the stream corridor in steep mountain catchments. We employ rapid, cost-effective passive seismic measurements to evaluate the variable thickness of the shallow colluvial and alluvial aquifer sediments along a headwater stream supporting cold water-dependent brook trout (Salvelinus fontinalis) in Shenandoah National Park, VA, USA. Using a mean depth to bedrock of 2.6m, numerical models predicted strong sensitivity of shallow aquifer temperature to the downward propagation of surface heat. The annual temperature dynamics (annual signal amplitude attenuation and phase shift) of potential seepage sourced from the shallow modeled aquifer were compared to several years of paired observed stream and air temperature records. Annual stream water temperature patterns were found to lag local air temperature by ∼8–19 d along the stream corridor, indicating that thermal exchange between the stream and shallow groundwater is spatially variable. Locations with greater annual signal phase lag were also associated with locally increased amplitude attenuation, further suggestion of year-round buffering of channel water temperature by groundwater seepage. Numerical models of shallow groundwater temperature that incorporate regional expected climate warming trends indicate that the summer cooling capacity of this groundwater seepage will be reduced over time, and lower-elevation stream sections may no longer serve as larger-scale climate refugia for cold water fish species, even with strong groundwater discharge.

      PubDate: 2018-02-26T20:21:38Z
      DOI: 10.1016/j.limno.2017.02.005
      Issue No: Vol. 68 (2018)
  • Changes in submerged macrophyte colonization in shallow areas of an
           oligo-mesotrophic lake and the potential role of groundwater
    • Authors: Cécile Périllon; Klaus van de Weyer; Jens Päzolt; Peter Kasprzak; Sabine Hilt
      Pages: 168 - 176
      Abstract: Publication date: January 2018
      Source:Limnologica, Volume 68
      Author(s): Cécile Périllon, Klaus van de Weyer, Jens Päzolt, Peter Kasprzak, Sabine Hilt
      Groundwater influx can significantly contribute to nutrient budgets of lakes and its influence is strongest in shallow littoral areas. In oligo- or mesotrophic systems, additional nutrient supply by groundwater influx may affect benthic primary producers and their interactions. Potential changes can be expected in community composition, biomass, stoichiometry and interactions between submerged macrophytes and epiphyton. This study aimed at investigating whether enhanced epiphyton growth at sites with groundwater discharge may have contributed to a significant change in shallow littoral macrophyte abundance reported from oligo-mesotrophic Lake Stechlin during the last 50 years. In the 1960s, shallow littoral areas were dominated by small charophyte species such as Chara aspera, C. filiformis and C. rudis. Recent mappings indicated a strong decline of this shallow water charophyte community from 42ha to 3ha and a shift to the occurrence of macrophyte species typical of eutrophic lakes such as Potamogeton perfoliatus, P. pectinatus and Myriophyllum spicatum. We analyzed the nutrient content of macrophytes, and measured epiphyton growth at sites with different groundwater influence. Water column nutrient enrichment may have increased the abundance of eutrophic species, but this did not explain the decrease of charophytes. Our data suggest that enhanced epiphyton growth in shallow littoral areas with groundwater influx could impair the development of small charophytes by shading, increasing drag forces and the charophytes’ sensitivity to herbivory.

      PubDate: 2018-02-26T20:21:38Z
      DOI: 10.1016/j.limno.2017.03.002
      Issue No: Vol. 68 (2018)
  • Factors influencing phosphorus regeneration by lake zooplankton—An
           experimental approach
    • Authors: Jolanta Ejsmont-Karabin; Irina Feniova; Iwona Kostrzewska-Szlakowska; Marek Rzepecki; Varos G. Petrosyan; Andrew R. Dzialowski
      Abstract: Publication date: Available online 14 February 2018
      Author(s): Jolanta Ejsmont-Karabin, Irina Feniova, Iwona Kostrzewska-Szlakowska, Marek Rzepecki, Varos G. Petrosyan, Andrew R. Dzialowski
      Phosphorus and nitrogen concentrations in the trophogenic zone in lakes are main factors determining the trophic state of lakes. The goal of this work was to assess the impacts of enrichment of lake water with nutrients, as well as the presence of large crustaceans, Dreissena polymorpha and fish on the process of phosphorus regeneration by zooplankton (rotifers and crustaceans) in experimental mesocosms. The experiment was carried out for 32 days and consisted of 12 treatments, each replicated in triplicate. The mesocosms were filled with 270 L of natural pelagic water from the eutrophic Lake Mikołajskie and kept on the shore of the lake. Fish did not to have any impact on phosphorus regeneration rates in any of the treatments, whereas the presence of bivalves increased phosphorus regeneration rates. Phosphorus regeneration rates did not affect phosphorus sedimentation in any of the treatments, but the loss of total phosphorus and its increased regeneration rates resulted in markedly decreasing turnover times of phosphorus in all treatments of the experiment. Nutrient enrichment mainly affected phosphorus regeneration by phytophagous and predatory crustaceans and had no impact on phosphorus regeneration by rotifers when large Cladocera were absent. Processes of phosphorus regeneration and uptake included in internal phosphorus cycling were under strong influence of biological factors, which acted quickly, through the changing trophic structure of zooplankton communities, which in turn changed the flow of phosphorus in trophic chains.

      PubDate: 2018-02-26T20:21:38Z
      DOI: 10.1016/j.limno.2018.01.003
  • Genetic diversity of the invasive crayfish Procambarus clarkii in France
    • Authors: Mauricio Pereira Almerão; Carine Delaunay; Aurore Coignet; Douglas Fernando Peiró; François Pinet; Catherine Souty-Grosset
      Abstract: Publication date: Available online 31 January 2018
      Author(s): Mauricio Pereira Almerão, Carine Delaunay, Aurore Coignet, Douglas Fernando Peiró, François Pinet, Catherine Souty-Grosset
      Procambarus clarkii is a widespread invasive species and its biological traits have often been used to explain its successful colonization of new areas. However, studies on the genetic features of invasive populations are still scarce, and the use of molecular markers could bring new insights about biological invasions. After being introduced in Spain in 1973, P. clarkii was introduced in France (≈1976) and nowadays is widespread in its territory (61 departments) in wetlands which provide good conditions for a successful colonization. Here we ask whether the genetic diversity of invasive populations could help to understand the evolutionary history of its invasion. To investigate this issue, 227 individuals of P. clarkii from 27 French populations and 10 departments were collected, and a 553 bp COI fragment was amplified and sequenced using universal primers. For the analysis of genetic parameters, nucleotide diversity (π), and haplotype diversity (Hd), the populations were organized into four major groups. The nucleotide diversities (π) were 0.000154, 0.00119, 0.00118, and 0.00123 for group 1, 2, 3, and 4, respectively. The genetic diversity of French populations (Hd = 0.350; π = 0.00123) was lower than the native populations (Hd = 0.982; π = 0.00736). Nine haplotypes were found (H1–H9) in 230 sequences. Haplotype diversity (Hd) was 0.444, 0.239, 0.330, and 0.350 for groups 1, 2, 3, and 4, respectively. The haplotype network showed very similar haplotypes, differing by few mutational steps and showing some complex relationships. Three haplotypes related to the species’ native region were found (H1, H2, and H3). Each of these haplotypes was also related to biogeographical regions. The most frequent haplotype (H2) was widespread throughout 10 departments. The other six haplotypes (H4, H5, H6, H7, H8, and H9) were not found in the native region but, in some cases, shared some French populations. Translocation by humans is the most plausible explanation of the observed haplotype relationships. We suggest that genetic information should play a larger role in the development of policies to manage invasive species.

      PubDate: 2018-02-04T19:15:43Z
      DOI: 10.1016/j.limno.2018.01.002
  • The structuring role of submerged macrophytes in a large subtropical
           shallow lake: Clear effects on water chemistry and phytoplankton structure
           community along a vegetated-pelagic gradient
    • Authors: Tiago Finkler Ferreira; Luciane O. Crossetti; David M.L. Motta Marques; Luciana Cardoso; Carlos Ruberto Fragoso; Egbert H. van Nes
      Abstract: Publication date: Available online 31 January 2018
      Author(s): Tiago Finkler Ferreira, Luciane O. Crossetti, David M.L. Motta Marques, Luciana Cardoso, Carlos Ruberto Fragoso, Egbert H. van Nes
      It is well known that submerged macrophytes exert positive feedback effects that enhance the water transparency, stabilizing the clear-water state in shallow temperate lakes. However, the structuring effect of macrophytes on the food web of subtropical and tropical ecosystems is still poorly understood. In this study we investigated the influence of dense submerged vegetation beds on the water chemistry and phytoplankton structure along a littoral-pelagic gradient of large subtropical shallow lake in southern Brazil. Seasonal monitoring was carried throughout one year following along a submerged vegetated-pelagic transect in order to analyze the effects of macrophyte’s coverage (percentage of volume infested- PVI) on the water chemistry and phytoplankton community structure. Clear variations on nutrient concentration and phytoplankton biomass/composition could be observed permanently along the transect. Nutrients as orto-phosphate (PO4 −) and bicarbonate increased linearly towards the pelagic zone, whereas dissolved organic carbon and humic substances decreased linearly as PVI decreased. Concomitantly, a significant increase in the phytoplankton biomass was observed outwards from the submerged vegetation bed. In the vegetated area, small species (C-R strategists), unicellular flagellates were selected; whereas in the pelagic zone, larger (K-selected) species of cyanobacteria occurred, especially representatives of the functional groups M, LO , SN, S1 and K. Such results indicate that the macrophytes and inherent metabolism, such as potential excretion of dissolved organic compounds with allelochemicals and nutrient uptake from water column influence the structure of the phytoplankton community reducing also significantly the biomass of cyanobacteria within the dense submerged vegetated zone. Because of the continuous growth of macrophytes over the year in low latitude systems, their feed-back effect pattern tends to also dictate a different role in ecosystem dynamics and structure of the food web. These findings contribute to the management and conservation of subtropical and tropical lakes.

      PubDate: 2018-02-04T19:15:43Z
      DOI: 10.1016/j.limno.2017.12.003
  • Factors shaping leech (Clitellata, Hirudinida) assemblages on artificial
           and natural substrata in urban water bodies
    • Authors: Żaneta Adamiak-Brud; Izabela Jabłońska-Barna; Aleksander Bielecki; Jarosław Kobak
      Abstract: Publication date: Available online 10 January 2018
      Author(s): Żaneta Adamiak-Brud, Izabela Jabłońska-Barna, Aleksander Bielecki, Jarosław Kobak
      Leech assemblages on the bottom substrata and artificial plates deployed in various types of waterbodies located in an urbanized area (Olsztyn, Northeastern Poland) were examined to identify environmental factors responsible for their distribution. The leech assemblages were not affected by physicochemical parameters of water. Important factors shaping the taxonomic composition of leech assemblages were the type of a waterbody (lakes, rivers, ponds) and human impact (including the land use, substratum quality and shoreline type). Waterbody type and human impact affected species richness, with lower values observed in small ponds and under stronger anthropogenic impact. The comparison of assemblages sampled manually from the bottom and from artificial plates deployed in the environment revealed that the artificial plates were a good alternative for traditional methods of leech sampling, particularly at strongly anthropogenically modified locations. Furthermore, several rare species: Alboglossiphonia striata, A. hyalina, Glossiphonia nebulosa, Hirudo medicinalis and Dina sp. were found in the urbanised areas under study, pointing out to their potential role in the conservation of these taxa.

      PubDate: 2018-02-04T19:15:43Z
      DOI: 10.1016/j.limno.2018.01.001
  • Limnology of the neotropical high elevation shallow lake Yahuarcocha
           (Ecuador) and challenges for managing eutrophication using biomanipulation
    • Authors: Willem Van Colen; Karen Portilla; Tania Oña; Guido Wyseure; Peter Goethals; Elizabeth Velarde; Koenraad Muylaert
      Pages: 37 - 44
      Abstract: Publication date: November 2017
      Source:Limnologica - Ecology and Management of Inland Waters, Volume 67
      Author(s): Willem Van Colen, Karen Portilla, Tania Oña, Guido Wyseure, Peter Goethals, Elizabeth Velarde, Koenraad Muylaert
      Temperate and tropical shallow lakes differ in several fundamental aspects with respect to management of eutrophication. High altitude tropical shallow lakes are a special case, showing similarities with temperate and tropical lakes. We studied the ecology of the eutrophic high-altitude tropical lake Yahuarcocha in the Ecuadorian Andes and evaluated the potential of biomanipulation to control eutrophication. With a toxin-producing Cylindrospermopsis bloom, low Secchi depth and low submerged macrophyte cover, Yahuarcocha is clearly in a turbid ecosystem state. Relatively low nutrient concentrations should theoretically allow for a shift to a clear water state through biomanipulation. Top-down control of phytoplankton by zooplankton, however, is complicated by the (1) absence of predatory fish, (2) fish community dominated by small poecelid species, (3) lack of a refuge for zooplankton from fish predation within the macrophytes, and (4) persistent, grazing resistant bloom of the cyanobacterium Cylindrospermopsis. In these aspects, lake Yahuarcocha is more similar to tropical shallow lakes, probably because water temperature is high relative to the mean air temperature and because of the absence of a cold season. The fish and macrophyte communities consisted almost entirely of exotic species. The exotic fish species probably stabilized the turbid state in the lake.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.07.008
      Issue No: Vol. 67 (2017)
  • Comparison of DNA-fingerprinting (T-RFLP) and high-throughput sequencing
           (HTS) to assess the diversity and composition of microbial communities in
           groundwater ecosystems
    • Authors: Karsten Karczewski; H. Wolfgang Riss; Elisabeth I. Meyer
      Pages: 45 - 53
      Abstract: Publication date: November 2017
      Source:Limnologica - Ecology and Management of Inland Waters, Volume 67
      Author(s): Karsten Karczewski, H. Wolfgang Riss, Elisabeth I. Meyer
      The majority of usable freshwater is stored as groundwater in the subsurface. Pristine groundwater ecosystems are characterised as oligotrophic environments which facilitate low energy yield, activity, growth, and reproduction for numerous and highly adapted organisms living in these environments. Degradation of groundwater quality and quantity are hence reflected in the structural changes of groundwater species communities. Despite an increasing awareness of this problem, current assessment methods for groundwater ecosystems are solely based on the analysis of abiotic parameters. However, this approach is insufficient to detect changes in microbial communities and their related metabolic functions. In recent years, the development of culture-independent molecular techniques to analyse microbes has vastly improved our knowledge concerning the diversity and composition of microbial communities in various environments. High-throughput sequencing (HTS) techniques enable the detection of single bacterial species in a sample and thus provide a high resolution of the composition and diversity of microbial communities in various environments. Furthermore, the taxonomic information obtained allows for the inference of metabolic functions of a given community. However, since the method is labour intensive and costly it is not necessarily the method of choice for analysing numerous samples. By comparison, DNA-fingerprinting is a less elaborate and inexpensive method that is able to detect changes in microbial communities, although identification of species present in a community is not possible, and therefore represents a valuable supplement to HTS. The present paper intends to render information about the applicability of this method as a monitoring tool against this background, by directly comparing results of DNA-fingerprinting with the results of HTS. Despite the fact that the analysis of bacterial communities using HTS captured significantly higher diversity estimates in our study, results of both methods were positively associated. And even though HTS produced more accurate and detailed results regarding composition and diversity of bacterial communities, patterns of community composition captured by DNA-fingerprinting were similar in comparison to HTS. We thus can suggest DNA-fingerprinting as a cost efficient alternative for community assessment and diversity estimation, specifically as a promising methodological approach in environmental assays.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.10.001
      Issue No: Vol. 67 (2017)
  • How does the groundwater influence the water balance of a lowland
           lake' A field study from Lake Stechlin, north-eastern Germany
    • Authors: Franziska Pöschke; Gunnar Nützmann; Peter Engesgaard; Jörg Lewandowski
      Abstract: Publication date: Available online 6 December 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Franziska Pöschke, Gunnar Nützmann, Peter Engesgaard, Jörg Lewandowski
      The subsurface catchment of Lake Stechlin is quite complex. Water level measurements in groundwater wells with different screen depths show that groundwater in the lake’s catchment may partly discharge to the lake and partly leak to deeper aquifers. Simple steady-state 2D vertical modelling of eight different scenarios (different leakage areas, different hydraulic conductivities) was conducted in order to explore the local and regional groundwater flow system around Lake Stechlin and the origin and possible magnitude of lacustrine groundwater discharge. A comparison of the different scenarios with in situ measurements of lacustrine groundwater discharge by temperature sticks and seepage meters revealed that only a part of the groundwater recharge in the catchment discharges to the lake while the rest leaks into deeper aquifers. This implies a differentiation of the subsurface catchment into a local and a regional flow system and impacts on travel times and chemical reaction time scales.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.11.005
  • Stable isotopes reveal food web reliance on different carbon sources in a
           subtropical watershed in South China
    • Authors: Yanyi Zeng; Zini Lai; Wanling Yang; Haiyan Li
      Abstract: Publication date: Available online 6 December 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Yanyi Zeng, Zini Lai, Wanling Yang, Haiyan Li
      Fish species in the Pearl River Watershed (PRW), the largest subtropical watershed in southern China, have declined dramatically in recent decades. To protect river habitats and maintain the integrity of river ecosystems, we need to know how different carbon sources contribute to aquatic food webs. We used information about stable carbon and nitrogen isotopes and IsoSource software to investigate the relative contributions of different carbon sources to the food web of the PRW. We found that the stable signatures of C3 plants (C3P), particulate organic matter (POM), submersed water grasses (SWG), and C4 plants (C4P) were significantly different and fell into four distinct groups. Of these, C3P was a high and stable source of carbon to certain consumers, while C4P was a low but stable carbon source. In comparison, the contributions from the POM and SWG groups were unstable and varied widely, between the 1st and 99th confidence intervals. The results suggest that the C3P, POM, and SWG groups might be important carbon sources for the PRW food web. Analysis of the 99th confidence interval contribution of each group that provided more than 50% showed that consumers in the PRW food web might be divided into those that mainly relied on C3P, those that mainly relied on SWG, those that potentially relied on C3P-SWG, and those that potentially relied on POM-SWG. This study provides basic information that will help support the protection and management of the PRW ecosystem, and will be especially useful to help restore submersed macrophyte beds and riparian buffer strips in this watershed.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.11.003
  • Zooplankton abundance: A neglected key element in the evaluation of
           reservoir water quality
    • Authors: Jara García-Chicote; Xavier Armengol; Carmen Rojo
      Abstract: Publication date: Available online 6 December 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Jara García-Chicote, Xavier Armengol, Carmen Rojo
      Based on our results, we propose the use of zooplankton abundance (density or biomass) as an indicator to complement the information currently being used concerning the quality of water in reservoirs. Until now, the Water Framework Directive (EU) for lakes and reservoirs has not included zooplankton because the classification of the water trophic state is based on a bottom-up model: an increase in nutrients implies an increase in primary producers and, therefore, poorer water quality. The use of zooplankton has recently been claimed due to their sensitivity to environmental changes and their control over primary producers. From our work, carried out from 2006 to 2009 (summer and winter seasons) in 20 reservoirs found in various Mediterranean river basins, we prove the relationship of the abundance of zooplankton with the trophic state. Zooplankton abundance, with or without interaction with other agents, explained much of the distribution of total phosphorus in the reservoirs, thus relating the trophic status with the aquatic food chain. In addition, we have found, illustrated by the zooplankton: phytoplankton ratio, how the top-down control masked high production situations in the system. Zooplankton's ability to cover up these cases of poor water quality highlight that the indicators presently being used are frequently insufficient.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.11.004
  • DNA barcoding reveals invasion of two cryptic Sinanodonta mussel species
           (Bivalvia: Unionidae) into the largest Siberian river
    • Authors: Yulia V. Bespalaya; Ivan N. Bolotov; Olga V. Aksenova; Mikhail Yu. Gofarov; Alexander V. Kondakov; Ilya V. Vikhrev; Maxim V. Vinarski
      Abstract: Publication date: Available online 6 December 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Yulia V. Bespalaya, Ivan N. Bolotov, Olga V. Aksenova, Mikhail Yu. Gofarov, Alexander V. Kondakov, Ilya V. Vikhrev, Maxim V. Vinarski
      This study provides the first record of the two distinct mitochondrial lineages of Sinanodonta mussels in the Yenisei River that forms the largest Siberian river basin. It is the first discovery of alien populations of these mussels in Russia. The two mussel lineages are living in sympatry in a river site heated by warm water discharge of the Krasnoyarsk thermal power plant. These lineages represent two cryptic species: Sinanodonta aff. woodiana lineage E and S. ovata Bogatov and Starobogatov, 1996. The population of the first species from the Yenisei shares the invasive haplotype that is widely spread across Europe. The molecular evidence suggests that this lineage originated from the Yangtze River, China. The native distribution of the second species ranges across South Korea, Japan and small basins in the south of Primorsky Krai, Russian Far East. The possible vector of this invasion is the introduction of fish hosts or adult mussels by aquarists. Our results highlight that the populations of Sinanodonta species outside their native ranges may represent an overlooked but important threat for freshwater ecosystems in Russia that should be considered an unexpected nation-level ecological problem. Additionally, our discovery reveals the possibility of a successful joint invasion of different Sinanodonta species into a single river that may increase negative impacts of invaders on indigenous communities. Some implications of our findings for systematics of the unionid mussels are also discussed.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.11.009
  • Can age-0 Silver Carp cross laboratory waterfalls by leaping'
    • Authors: Xiaotao Shi; Zhijun Jin; Yan Liu; Xiao Hu; Junjun Tan; Qiuwen Chen; Yingping Huang; Defu Liu; Yu Wang; Xiaolian Gu
      Abstract: Publication date: Available online 6 December 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Xiaotao Shi, Zhijun Jin, Yan Liu, Xiao Hu, Junjun Tan, Qiuwen Chen, Yingping Huang, Defu Liu, Yu Wang, Xiaolian Gu
      It is not known how high age-0 Silver Carp (Hypophthalmichthys molitrix) can jump and whether they can jump voluntarily to cross waterfalls, a question that is potentially related to fishway design or prohibitions on distribution. Age-0 Silver Carp were observed to jump to a height (mean±SD) of 20.53±5.26cm (1.90±0.48 times of total length) when startled by a jet of water, exhibiting a jumping speed of 23.88±4.42cm/s. The number of leaps, entry rate, and success rate were significantly affected by waterfall height (5, 10, or 15cm) but not by discharge rate (0.002, 0.004, or 0.006m3/s). The success rate (fish crossing the waterfall) was low for all waterfalls, with the median success rate being the highest (10%) for the 5-cm drop. When overcoming the 5-cm drop, fish used standing, swim-in, and leaping behaviors, whereas only leaping behavior was used for higher drops. These results suggest that age-0 Silver Carp are capable of leaping, but they have a poor ability to voluntarily cross waterfalls and appear to avoid the downstream turbulence produced by waterfall conditions.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.11.006
  • Water mites (Acari: Parasitengona: Hydrachnidia) as inhabitants of
           groundwater-influenced habitats–considerations following an update of
           Limnofauna Europaea
    • Authors: Reinhard Gerecke; Peter Martin; Terence Gledhill
      Abstract: Publication date: Available online 6 December 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Reinhard Gerecke, Peter Martin, Terence Gledhill
      Following an update of the survey of the European water mite fauna (Acari: Hydrachnidia) last published by K. Viets (1978), we confirmed the occurrence of 970 species. Based on the evaluation of these data, new bibliography and our own unpublished data, the main habitat preference is determined for each species. The resulting ecological data are analysed with a main focus on species inhabiting groundwater-influenced habitats. No other invertebrate group includes a similarly high share of species with a particular relationship to spring habitats: about one fifth of the European Hydrachnidia has a preference for spring habitats, a total number of 137 (14%) is crenobiontic (living exclusively in springs). The following topics are addressed: (1) the significance of spring habitats for the diversity of water mites − percentage of crenobionts/crenophiles at different geographical latitudes; (2) regional stenotopy − intraspecific differences in habitat preference between populations at different latitudes; (3) communities colonizing springs vs. hyporheic − similarities and differences; (4) evolution of crenobiosis in water mites − potential governing factors; (5) endangered species − direct and indirect anthropogenic threats to the natural diversity of water mites.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.11.008
  • Effect of Riparian Management on Stream Morphometry and Water Quality in
           Oil Palm Plantations in Borneo
    • Authors: Darshanaa Chellaiah; Catherine M. Yule
      Abstract: Publication date: Available online 6 December 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Darshanaa Chellaiah, Catherine M. Yule
      Large-scale conversion of tropical forests into agricultural plantations, particularly oil palm (OP) across South East Asia exerts enormous pressure on freshwater systems. To mitigate impacts on aquatic ecosystems, the retention of riparian buffer zones along stream banks are often advocated for freshwater management. However, there is a severe lack in ecological information available on tropical stream systems advising on the efficacy of different riparian buffer types (with varying quality) to mitigate stream physico-chemical properties after conversion for agricultural use. To test the hypothesis that greater riparian disturbance will have negative effects on stream geomorphology and water quality, we assessed the impacts of riparian vegetation structure and density on stream chemical and physical properties in different riparian buffer types commonly used in OP plantations subjected to a gradient of disturbance: (i) Native forest (NF); (ii) OP − forested buffer (OPF); (iii) OP − untreated palms buffer (no fertilizer and pesticide application) (OPOP); and (iv) OP − treated palms (OPNB). Across the disturbance gradient, riparian species diversity and density decreased with taller trees and high foliage cover. Foliage cover heavily influenced the amount of light received at the stream, bank and buffer zone that concur with stream water temperatures. In-stream litter substrate decreased with increased riparian disturbance. OP streams had higher phosphorus and potassium concentrations that can be attributed to the use of fertilizers while sodium concentrations were higher in NF streams. Generally, OPF was most similar to NF sites whereas OPOP and OPNB sites had similar characteristics showing that riparian vegetation type influences the physical and chemical characteristics of streams. Thus, the use of high quality riparian buffers with forested riparian vegetation in OP plantations to reduce the impacts of land conversion on streams is supported.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.11.007
  • A pigment composition analysis reveals community changes in
           pre-established stream periphyton under low-level artificial light at
    • Authors: Maja Grubisic; Gabriel Singer Cristina Bruno Roy H.A. van Grunsven
      Abstract: Publication date: Available online 5 December 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Maja Grubisic, Gabriel Singer, M. Cristina Bruno, Roy H.A. van Grunsven, Alessandro Manfrin, Michael T. Monaghan, Franz Hölker
      Freshwaters are increasingly exposed to artificial light at night (ALAN), yet the consequences for aquatic primary producers remain largely unknown. We used stream-side flumes to expose three-week-old periphyton to LED light. Pigment composition was used to infer community changes in LED-lit and control periphyton before and after three weeks of treatment. The proportion of diatoms/chrysophytes decreased (14%) and cyanobacteria increased (17%) in lit periphyton in spring. This may reduce periphyton nutritional quality in artificially-lit waters.

      PubDate: 2017-12-12T04:24:24Z
  • Integrating genetics and morphometrics in species conservation—A case
           study on the stone crayfish, Austropotamobius torrentium
    • Authors: Christian Berger; Anamaria Štambuk; Ivana Maguire; Steven Weiss; Leopold Füreder
      Abstract: Publication date: Available online 28 November 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Christian Berger, Anamaria Štambuk, Ivana Maguire, Steven Weiss, Leopold Füreder
      The stone crayfish, Austropotamobius torrentium, is a freshwater crayfish species native to Central and Southeast Europe. Due to various, mostly anthropogenic factors the species is facing a dramatic decline in many European countries. In order to plan and implement protection measures, it is essential to collect extensive data on the species, including biological aspects and the major threats. Therefore, in the frame of a species conservation program in western Austria, we assessed the genetic relationship of the local endangered stone crayfish populations to populations in eastern Switzerland and southern Germany as well as their genetic diversity using mitochondrial and nuclear DNA markers. Population differentiation was measured applying both genetic and morphometric tools in order to estimate the suitability of potential donor populations for future restocking and reintroduction measures. The results showed a high degree of genetic homogeneity at the lineage level in the alpine stretch of the Rhine valley. Despite a rather low genetic diversity, nuclear markers provided signs of genetic divergence among populations even at a local scale. Due to the inconsistencies found between genetic and morphometric differentiation patterns, we highlight the importance of integrating both tools for the identification of suitable crayfish stocking material.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.11.002
  • Habitat preferences in freshwater benthic macroinvertebrates: Algae as
           substratum and food resource in high mountain rivers from Mexico
    • Authors: Angela Caro-Borrero; Javier Carmona-Jiménez
      Abstract: Publication date: Available online 22 November 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Angela Caro-Borrero, Javier Carmona-Jiménez
      The diversity of benthic macroinvertebrates in lotic systems is closely related to the availability and heterogeneity of habitats. These habitats may be of inorganic origin, such as the rocky substratum associated with the river bed, or organic such as macroscopic algae. The objective of this study was to determinate the importance of five species of algae that differ in their morphological type as a substratum and food resource regarding the associated establishment of macroinvertebrate assemblages taking account the climatic seasonality (warm dry, cool dry and rainy). We then evaluate the differences in macroinvertebrates assemblages with respect to the inorganic substratum by sampling high mountain rivers in central Mexico. The mucilaginous colonies of Nostoc parmelioides and Placoma regulare, the pseudoparenchymatous bambusiform thallus of Paralemanea mexicana and the laminate thallus of Prasiola mexicana had the highest densities of macroinvertebrates, represented by the genera Cricotopus, Paramerina, Simulium and Tanytarsini tribe. The relationship between algal morphological type and the richness and diversity of macroinvertebrates was positively related to specific conductivity, total dissolved solids and discharge variables. The dominant taxa associated with the inorganic substratum belonged mainly to the Trichoptera, Diptera and Ephemeroptera orders. Water temperature, discharge and concentration of orthophosphates were the main environmental variables able to explain the diversity of macroinvertebrates on this substratum. The dominance of detritivorous macroinvertebrates in these mountain rivers suggests the contribution of allochthonous organic matter possibly of anthropogenic origin. The assemblages of macroinvertebrates on inorganic substratum did not significantly differ among sites or climatic seasons.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.10.002
  • How to facilitate freshwater macroinvertebrate reintroduction'
    • Authors: Arlena C. Dumeier; Armin W. Lorenz; Ellen Kiel
      Abstract: Publication date: Available online 15 November 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Arlena C. Dumeier, Armin W. Lorenz, Ellen Kiel
      Reintroduction is a common conservation strategy although rarely conducted in freshwater ecosystems. We present a reintroduction approach for freshwater invertebrates. Different natural substrates and exposure times were tested for presence and abundance of stream type specific macroinvertebrates. Wood leaf mixture demonstrated statistically significant highest mean abundances compared to other substrates. Moreover, they displayed comparatively high mean numbers when exposed for six weeks. We thus propose a natural substrate exposure method for reintroduction of aquatic insects.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.11.001
  • Sources of organic matter in the surface sediments from Lake Sihailongwan
           Maar and Lake Zhanjiang Maar (Lake Huguangyan Maar) in China
    • Authors: Jidun Fang; Fengchang Wu; Yongqiang Xiong; Fasheng Li; Hongjun Yang; Shuping Wang; Yan Xie
      Abstract: Publication date: Available online 14 November 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Jidun Fang, Fengchang Wu, Yongqiang Xiong, Fasheng Li, Hongjun Yang, Shuping Wang, Yan Xie
      Maar lakes are closed lakes that have a well-documented history of changes in organic matter (OM) production. The surface sediments from 2 typical maar lakes in China were analyzed for total organic carbon (TOC), total nitrogen (TN), δ13Corg, δ15Ntotal, aliphatic hydrocarbons (AHs), fatty acids (FAs) and alkanols. The FAs and alkanols were fractionated into two sub-fractions (free and bound) to investigate their sources. A higher TOC content was observed in the surface sediment from Lake Sihailongwan Maar than that from Lake Zhanjiang Maar. The molecular compositions of the n-alkanes, n-alkanols and FAs extracted from the surface sediments reveal different responses to environmental changes. The fatty acid distributions are dominated by short-chain components from algal and bacterial origins. However, the n-alkane and free n-alkanol distributions in the surface sediment from Lake Sihailongwan Maar are dominated by long-chain terrestrial source inputs, indicating that the secondary components of the post-depositional microbial activity are important for the FAs in the sediment from Lake Sihailongwan Maar. The aquatic FAs derived from algae and anaerobic bacteria are major components of sedimentary OM in all of the studied samples.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.08.004
  • Assessing net-uptake of nitrate and natural dissolved organic matter
           fractions in a revitalized lowland stream reach
    • Authors: Daniel Graeber; Stefan Lorenz; Jane Rosenstand Poulsen; Marlen Heinz; Daniel von Schiller; Björn Gücker; Jörg Gelbrecht; Brian Kronvang
      Abstract: Publication date: Available online 14 November 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Daniel Graeber, Stefan Lorenz, Jane Rosenstand Poulsen, Marlen Heinz, Daniel von Schiller, Björn Gücker, Jörg Gelbrecht, Brian Kronvang
      Lowland streams are often revitalized by hydrologically reconnecting their surrounding terrestrial environment, which likely alters central ecosystem functions such as autotrophic and heterotrophic carbon and nutrient metabolism. However, such central ecosystem functions of stream reaches following revitalization have rarely been investigated. Here, we measured net-uptake of nitrate and of various dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) fractions (using size-exclusion chromatography, SEC), as well as fluorescence components (established by parallel factor analysis, PARAFAC) repeatedly along a revitalized 1.4km reach of a Danish lowland stream during base flow conditions. Samples were taken at six stations every three hours for one day. We measured discharge at five of the six stations to calculate whole-stream net-uptake. Moreover, we continuously measured oxygen at the start and at the end of the reach to assess stream metabolism, and took piezometer samples from ten shallow groundwater sites to assess potential determinants of organic matter and nitrate metabolism. We found high metabolic activity within the stream reach with a gross-primary production of 4.8 and 3.6g O2 m−2 day−1 and a production to respiration ratio of 0.8 and 0.9 at the start and end of the reach, respectively. Nitrate exhibited relatively constant high net-uptake rates of 0.41–0.52gNm−2 d−1, which varied little and were not related to the time of the day. Therefore, autotrophic nitrate uptake for was likely of minor importance, despite the apparently high primary production. In contrast, SEC DON and DOC fractions, as well as PARAFAC components did not suggest net-uptake or release. Instead, DOC and DON concentration were highly variable among the six stations and sampling times, a pattern that was not explainable by measurement errors but was likely related to the high variability of DOC and DON concentrations in the hyporheic zone and adjacent groundwater bodies. This pointed to a potentially high interaction with the hyporheic and riparian zone, underlining the strong linkage of DOM-related processes across the terrestrial-aquatic boundary. The high nitrate uptake points to the high retention potential of revitalized stream reaches, which, however, would need to be corroborated by further studies with reference reaches.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.10.003
  • Inside Front Cover - Editorial Board Page/Cover image legend if applicable
    • Abstract: Publication date: November 2017
      Source:Limnologica - Ecology and Management of Inland Waters, Volume 67

      PubDate: 2017-12-12T04:24:24Z
  • Synthesizing redox biogeochemistry at aquatic interfaces
    • Authors: Maximilian Peter Lau; Robert Niederdorfer; Armando Sepulveda-Jauregui; Michael Hupfer
      Abstract: Publication date: Available online 27 October 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Maximilian Peter Lau, Robert Niederdorfer, Armando Sepulveda-Jauregui, Michael Hupfer
      The exchange of matter and energy between confined components of aquatic ecosystems requires the passage through their interfaces. This passage is characterized by rapid changes in physical, chemical and biological conditions and often triggers chemical transformations that involve the exchange of electrons: redox reactions. Over the last decades, research in aquatic biogeochemistry has resulted in many new but conceptually isolated findings that, together, frame an emergent view on the overarching principles of aquatic redox processes. A thermodynamic assessment may reveal the maximum available energy from such redox reactions. However, this energy can rarely be released due to various morphological, ecological and kinetic constrains on the turnover reactions. As these constrains set the boundary conditions for aquatic ecosystem functioning, they deserve particular attention in freshwater research. Here, we illustrate how physical and structural traits shape a complex redox environment and how this environment ultimately exercises control on the inhabiting microbial community and its metabolism. This aquatic microbiome is the key entity of material turnover. At the same time, the biome possesses the capability to feed back on its environment by shaping the local redox conditions and sustain niche existences. We discuss current and emerging ideas of how microorganisms engineer their environment, affecting aquatic redox reactions. In total, we examine this feed-back cycling between the physical environment and its colonizing biome to encourage the reader to take on the redox perspective when analyzing processes at aquatic interfaces. Understanding electron fluxes on both temporal and spatial scales is essential for the overall comprehension of matter and energy fluxes through freshwater environments. We pinpoint the methodological frontiers that will need to be challenged in future studies of aquatic redox processes. An improved mechanistic understanding will be instrumental in estimating sink and source properties of aquatic ecosystems.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.08.001
  • Low flow controls on stream thermal dynamics
    • Authors: Silvia Folegot; David M. Hannah; Stephen J. Dugdale; Marie J. Kurz; Jennifer D. Drummond; Megan J. Klaar; Joseph Lee-Cullin; Toralf Keller; Eugènia Martí; Jay P. Zarnetske; Adam S. Ward; Stefan Krause
      Abstract: Publication date: Available online 16 October 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Silvia Folegot, David M. Hannah, Stephen J. Dugdale, Marie J. Kurz, Jennifer D. Drummond, Megan J. Klaar, Joseph Lee-Cullin, Toralf Keller, Eugènia Martí, Jay P. Zarnetske, Adam S. Ward, Stefan Krause
      Water level fluctuations in surface water bodies, and in particular low flow drought conditions, are expected to become more frequent and more severe in the future due to the impacts of global environmental change. Variations in water level, and therefore in-channel water volume, not only have the potential to directly impact stream temperature, but also aquatic vegetation coverage which, in turn, may affect stream temperature patterns and dynamics. Manipulation experiments provide a systematic approach to investigate the multiple environmental controls on stream temperature patterns. This study aims to use temperature data loggers and fibre optic distributed temperature sensing (FO-DTS) to investigate potential drought impacts on patterns in surface water and streambed temperature as a function of change in water column depth. To quantify the joint impacts of water level and associated vegetation coverage on stream temperatures, investigations were conducted in outdoor flumes using identical pool-riffle-pool features, but with spatially variable water levels representative of different drought severity conditions. Naturally evolved vegetation growth in the flumes ranged from sparse vegetation coverage in the shallow flumes to dense colonization in the deepest. Observed surface water and streambed temperature patterns differed significantly within the range of water levels and degrees of vegetation coverage studied. Streambed temperature patterns were more pronounced in the shallowest flume, with minimum and maximum temperature values and diurnal temperature variation being more intensively affected by variation in meteorological conditions than daily average temperatures. Spatial patterns in streambed temperature correlated strongly with morphologic features in all flumes, with riffles coinciding with the highest temperatures, and pools representing areas with the lowest temperatures. In particular, the shallowest flume (comprising multiple exposed features) exhibited a maximum upstream-downstream temperature warming of 3.3°C (T in=10.3°C, T out=13.5°C), exceeding the warming observed in the deeper flumes by ∼2°C. Our study reveals significant streambed and water temperature variation caused by the combined impacts of water level and related vegetation coverage. These results highlight the importance of maintaining minimum water levels in lowland rivers during droughts for buffering the impacts of atmospheric forcing on both river and streambed water temperatures.

      PubDate: 2017-12-12T04:24:24Z
      DOI: 10.1016/j.limno.2017.08.003
  • Ecotoxicity of Musa paradisiaca leaf extract-coated ZnO nanoparticles to
           the freshwater microcrustacean Ceriodaphnia cornuta
    • Authors: Sekar Vijayakumar; Baskaralingam Vaseeharan; Balasubramanian Malaikozhundan; Mani Divya; Muthukumar Abhinaya; Narayanan Gobi; Attanu Bhattacharyya; Nachimuthu Balashanmugam; Dhan Surmistha; Kadarkarai Murugan; Giovanni Benelli
      Abstract: Publication date: Available online 12 October 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Sekar Vijayakumar, Baskaralingam Vaseeharan, Balasubramanian Malaikozhundan, Mani Divya, Muthukumar Abhinaya, Narayanan Gobi, Attanu Bhattacharyya, Nachimuthu Balashanmugam, Dhan Surmistha, Kadarkarai Murugan, Giovanni Benelli
      Nanotechnology has gained much interest due to their unique properties in science and technology. Different types of metallic nanoparticles are routinely synthesized but their release into the aquatic environments is a major concern of ecotoxicity. In this scenario, it is important to study the potential impact of engineered nanoparticle in aquatic organism’s especially freshwater microcrustacean, Ceriodaphnia cornuta. In this study, ZnO NPs were synthesized using the aqueous leaf extracts of Musa paradisiaca and physico-chemically characterized by UV-Visible spectroscopy, X-ray diffraction (XRD), Fourier transform infra red (FTIR), Scanning electron microscopy (SEM) and Atomic force microscopy (AFM). UV-visible spectra recorded the absorbance peak of ZnO NPs at 338nm. XRD analysis showed the various Bragg’s reflection peaks at 100, 002, 101, 102, 110, 103, 200, 112, 201, 004, 202 lattice planes. FTIR showed sharp intense peaks at 3416cm−1, 1388 and 1416cm−1. SEM showed the spherical shape of ZnO NPs with mean particle size 23.3nm. AFM confirmed the spherical shape and 3D topography of NPs. The ecotoxicity of ZnO NPs was tested on the freshwater crustacean Ceriodaphnia cornuta. ZnO NPs was comparatively less toxic than zinc acetate. ZnO NPs caused 42% mortality of C. cornuta at 50μgmL−1. However, 80% mortality was observed at 50μgmL−1 of zinc acetate after 24h. Light and confocal laser scanning microscopic images evidenced the uptake and accumulation of ZnO NPs in the gut C. cornuta at 50μgmL−1 after 24h. Structural deformities were observed on C. cornuta after treatment with 50μgmL−1 of ZnO NPs. Overall, this study describes the potential impact of the biologically synthesized ZnO NPs in comparison with zinc acetate in the freshwater crustacean, C. cornuta.
      Graphical abstract image

      PubDate: 2017-10-14T04:47:15Z
      DOI: 10.1016/j.limno.2017.09.004
  • Development of microsatellite loci for two Agabus diving beetle species
           from the pooled DNA and testing their utility in mountain lake populations
    • Authors: Darina Zuzana; Fedor
      Abstract: Publication date: Available online 10 October 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Darina Šípošová, Zuzana Čiamporová-Zaťovičová, Fedor Čiampor
      Diving beetles (Dytiscidae) are the most speciose water beetle group, occurring on all continents except Antarctica. They inhabit various lotic and lentic habitats and play an important role in ecosystem functioning. In this study, we developed functional polymorphic microsatellites for two widely distributed species from one of the most diversified dytiscid genus Agabus: Agabus bipustulatus (Linnaeus, 1767) and Agabus cf. guttatus from the Agabus guttatus group sensu Foster and Bilton (1997). For microsatellites development, pooled DNA and NGS pyrosequencing were used. Microsatellites are still very useful genetic markers for studying recent population changes, but for dytiscids, highly diversified and ecologically important group of freshwater invertebrates, only 8 microsatellite loci are available for one North American species. To test utility of the developed markers, we used several populations of alpine lakes, situated in the Tatra Mountains (Western Carpathians). From the 60 tested markers, 13 loci for Agabus bipustulatus and 8 loci for A. cf. guttatus showed polymorphism. The number of alleles per locus varied from 2 to 10 and no significant linkage disequilibrium was observed. Observed/expected heterozygosity varied from 0/0.077 to 1/0.834 within populations of A. cf. guttatus and from 0/0.056 to 1/0.837 within populations of A. bipustulatus. The significant deviation from HWE was probably caused by presence of null alleles or undetected biological processes. Bayesian cluster analysis revealed differences in the cluster proportions, confirming applicability of the developed markers for future studies of population structure of both Agabus species.

      PubDate: 2017-10-11T04:26:00Z
  • High-resolution simulation of free-surface flow and tracer retention over
           streambeds with ripples
    • Authors: Tabea Broecker; Waldemar Elsesser; Katharina Teuber; Ilhan Özgen; Gunnar Nützmann; Reinhard Hinkelmann
      Abstract: Publication date: Available online 4 September 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Tabea Broecker, Waldemar Elsesser, Katharina Teuber, Ilhan Özgen, Gunnar Nützmann, Reinhard Hinkelmann
      This study presents a novel high-resolution simulation of free-surface flow and tracer retention over a streambed with ripples based on varying ripple morphologies, surface hydraulics and the transport of a tracer pulse from surface water to surface dead zone. For the simulations, the computational fluid dynamics (CFD) model OpenFOAM was used to solve the three-dimensional Navier-Stokes equations in combination with an implemented transport equation. Pressure gradients at the streambed were used to account for hyporheic exchange, assuming water flow from high pressure zones to low pressure zones. Flow velocities, ripple sizes and spacing showed to significantly affect these pressure gradients, but also the transport of a passive tracer at the streambed, which was not investigated so far. Due to the velocity field, large parts of the tracer mass were transported alongside the main stream above the ripples. Tracer mass reaching the space between the ripples was temporarily retained due to low velocities and recirculations. It was shown that the retention is depending on the ripple size and space between the ripples as well as on the flow velocity. Decreasing ripple sizes and higher flow velocities lead to a smaller tracer retention. Furthermore we showed that the ripple length to height ratio controls the generation of recirculation zones which affect the residence time of the tracer significantly. Ripple spacing leads to temporarily higher tracer concentration at the streambed, but smaller tracer retention. We conclude that the impact of the streambed morphology on the hydraulics in combination with tracer retention should be addressed for a comprehensive understanding of compound movement, exchange and transformation within the hyporheic zone.

      PubDate: 2017-09-07T22:05:34Z
      DOI: 10.1016/j.limno.2017.06.005
  • Linking riparian forest harvest to benthic macroinvertebrate communities
           in Andean headwater streams in southern Chile
    • Authors: Giovany Guevara; Roberto Godoy; Marcela Franco
      Abstract: Publication date: Available online 4 August 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Giovany Guevara, Roberto Godoy, Marcela Franco
      Headwater streams are fully linked to surrounding riparian vegetation through coarse and fine organic matter inputs. However, forestry operations in or close to riparian corridors, particularly in mountainous forested microcatchments, can alter both the organic matter dynamics and the composition, structure and function of stream macroinvertebrate assemblages. Although it is an issue of great concern elsewhere, in Andean headwater streams scarce information exist about this respect. By using a paired-catchment approach (thinned vs. unthinned) in two sets of selected evergreen and deciduous small streams in southern Chile (39°S), we evaluated the effects of forest harvest on seasonal and annual litterfall dynamics and the structural and functional attributes of macroinvertebrates between January 2008 and January 2009. Metrics used to assess changes included riparian litterfall input, invertebrate colonization and leaf decomposition of dominant plant species (evergreen: Laureliopsis philippiana, Myrceugenia planipes; deciduous: Nothofagus alpina), taxa richness, functional feeding group (FFG) composition, and their densities and biomasses for each stream. In both experimental trials, microcatchments registered significant differences in the seasonal litterfall input. The total organic matter input was as follows: Unthinned evergreen (UE)=3699, thinned evergreen (TE)=3249, unthinned deciduous (UD)=3151, and thinned deciduous (TD)=2981kgha−1y−1. Leaf dry mass losses were significantly higher during summer and spring for L. philippiana and during summer and autumn for N. alpina. These results were concomitant to decomposition rates and macroinvertebrate abundance during colonization of the leaf bags. Macroinvertebrate density and biomass were also contrasted; shredders were the dominant FFG and showed significant seasonal differences between microcatchments in both in-stream and leaf bag studies. There were generally no major changes in FFG composition or taxa richness, but differences were detected comparatively in the abundance or density of collectors and shredders. Our results suggest that forestry activities carried out on riparian vegetation of Andean headwater streams can affect the structural and functional role of plants and benthic invertebrates and nutrient fluxes downstream.

      PubDate: 2017-09-02T14:22:10Z
      DOI: 10.1016/j.limno.2017.07.007
  • Flux dynamics at the groundwater-surface water interface in a tropical
    • Authors: Hai Manh Vu; Margaret Shanafield; Okke Batelaan
      Abstract: Publication date: Available online 12 July 2017
      Source:Limnologica - Ecology and Management of Inland Waters
      Author(s): Hai Manh Vu, Margaret Shanafield, Okke Batelaan
      Seasonal shifts between wet and dry seasons cause marked changes in river flow regimes and therefore exchanges with the streambed surface. This seasonal variation is particularly apparent in tropical climates, which are characterized by strong differences between wet and dry seasons. However, fluxes between surface water and groundwater and the impacts of these interactions on streambed dynamics are rarely investigated in tropical climates, where few surface water-groundwater field investigations have been performed. In this study, an intermittent river in south coastal Vietnam was investigated to better understand links between seasonal hydrologic shifts, human use of water resources, and streambed dynamics. Three transects along the main tributary were instrumented with water level and streambed temperature sensors to examine both spatial and temporal variability in stream-aquifer dynamics. Calibrated models estimated increasing streambed fluxes along the length of the river, with highly variable fluxes up to 1.6m2 h−1 upstream and 0.2m2 h−1 downstream during the rainy season (i.e. the rate of the total amount of water exchanged per meter of river length) decreasing to low fluxes of 1.0m2 h−1 upstream and 0.15m2 h−1 downstream in the dry season before flow ceased. During the wet and into the dry season the river was gaining (i.e. flux from the aquifer into the river) at all times and all locations with the notable exception of fluxes into the streambed only at the upstream and downstream sites during peak flow of the largest captured rain event (550mm in 164hours). Based on 30 years of precipitation data, this suggests that water is pushed from the stream into the streambed approximately three times per year. Groundwater withdrawal by households near the cross-sections was found to have a comparatively small effect on streambed fluxes, reducing the flux by up to 3% during dry conditions, although this pumping did cause a reversal in the gradient to the stream for a short period (less than 12hours) on one occasion during the dry season.

      PubDate: 2017-07-24T10:29:25Z
      DOI: 10.1016/j.limno.2017.06.003
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