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Publisher: Springer-Verlag (Total: 2352 journals)

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Showing 1 - 200 of 2352 Journals sorted alphabetically
3D Printing in Medicine     Open Access   (Followers: 2)
3D Research     Hybrid Journal   (Followers: 21, SJR: 0.222, CiteScore: 1)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.825, CiteScore: 1)
AAPS J.     Hybrid Journal   (Followers: 23, SJR: 1.118, CiteScore: 4)
AAPS PharmSciTech     Hybrid Journal   (Followers: 7, SJR: 0.752, CiteScore: 3)
Abdominal Imaging     Hybrid Journal   (Followers: 16, SJR: 0.866, CiteScore: 2)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4, SJR: 0.439, CiteScore: 0)
Academic Psychiatry     Full-text available via subscription   (Followers: 26, SJR: 0.53, CiteScore: 1)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.106, CiteScore: 0)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 29, SJR: 0.316, CiteScore: 1)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.359, CiteScore: 1)
Acoustics Australia     Hybrid Journal   (SJR: 0.232, CiteScore: 1)
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.367, CiteScore: 0)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.675, CiteScore: 1)
Acta Biotheoretica     Hybrid Journal   (Followers: 4, SJR: 0.284, CiteScore: 1)
Acta Diabetologica     Hybrid Journal   (Followers: 19, SJR: 1.587, CiteScore: 3)
Acta Endoscopica     Hybrid Journal   (Followers: 1)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.769, CiteScore: 1)
Acta Geochimica     Hybrid Journal   (Followers: 7, SJR: 0.24, CiteScore: 1)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 3, SJR: 0.305, CiteScore: 1)
Acta Geophysica     Hybrid Journal   (Followers: 11, SJR: 0.312, CiteScore: 1)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.588, CiteScore: 3)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.517, CiteScore: 1)
Acta Mathematica     Hybrid Journal   (Followers: 13, SJR: 7.066, CiteScore: 3)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.452, CiteScore: 1)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.379, CiteScore: 1)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.27, CiteScore: 0)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.208, CiteScore: 0)
Acta Mechanica     Hybrid Journal   (Followers: 21, SJR: 1.04, CiteScore: 2)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.607, CiteScore: 2)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7, SJR: 0.576, CiteScore: 2)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.638, CiteScore: 1)
Acta Neurochirurgica     Hybrid Journal   (Followers: 7, SJR: 0.822, CiteScore: 2)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 1, SJR: 0.376, CiteScore: 1)
Acta Neuropathologica     Hybrid Journal   (Followers: 4, SJR: 7.589, CiteScore: 12)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.334, CiteScore: 1)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 3, SJR: 0.574, CiteScore: 2)
Acta Politica     Hybrid Journal   (Followers: 15, SJR: 0.605, CiteScore: 1)
Activitas Nervosa Superior     Hybrid Journal   (SJR: 0.147, CiteScore: 0)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 8, SJR: 0.103, CiteScore: 0)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 25, SJR: 0.72, CiteScore: 2)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 17, SJR: 1.005, CiteScore: 2)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.703, CiteScore: 2)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4, SJR: 0.698, CiteScore: 1)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 37, SJR: 0.956, CiteScore: 2)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 19, SJR: 0.812, CiteScore: 1)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 59, SJR: 1.09, CiteScore: 1)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.144, CiteScore: 0)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 30, SJR: 1.64, CiteScore: 2)
Advances in Manufacturing     Hybrid Journal   (Followers: 4, SJR: 0.475, CiteScore: 2)
Advances in Polymer Science     Hybrid Journal   (Followers: 45, SJR: 1.04, CiteScore: 3)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 1.075, CiteScore: 3)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.517, CiteScore: 1)
Aerobiologia     Hybrid Journal   (Followers: 3, SJR: 0.673, CiteScore: 2)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 11, SJR: 0.825, CiteScore: 1)
African Archaeological Review     Hybrid Journal   (Followers: 20, SJR: 0.862, CiteScore: 1)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.235, CiteScore: 0)
AGE     Hybrid Journal   (Followers: 7)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.39, CiteScore: 1)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.67, CiteScore: 2)
Agricultural Research     Hybrid Journal   (Followers: 6, SJR: 0.276, CiteScore: 1)
Agriculture and Human Values     Hybrid Journal   (Followers: 14, SJR: 1.173, CiteScore: 3)
Agroforestry Systems     Hybrid Journal   (Followers: 20, SJR: 0.663, CiteScore: 1)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 13, SJR: 1.864, CiteScore: 6)
AI & Society     Hybrid Journal   (Followers: 9, SJR: 0.227, CiteScore: 1)
AIDS and Behavior     Hybrid Journal   (Followers: 14, SJR: 1.792, CiteScore: 3)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.862, CiteScore: 3)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 6, SJR: 0.531, CiteScore: 0)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.583, CiteScore: 1)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 1.095, CiteScore: 1)
Algorithmica     Hybrid Journal   (Followers: 9, SJR: 0.56, CiteScore: 1)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.234, CiteScore: 0)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 1.11, CiteScore: 3)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3)
AMBIO     Hybrid Journal   (Followers: 10, SJR: 1.569, CiteScore: 4)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 16, SJR: 0.951, CiteScore: 3)
American J. of Community Psychology     Hybrid Journal   (Followers: 29, SJR: 1.329, CiteScore: 2)
American J. of Criminal Justice     Hybrid Journal   (Followers: 9, SJR: 0.772, CiteScore: 1)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 17, SJR: 0.46, CiteScore: 1)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.181, CiteScore: 0)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.611, CiteScore: 1)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 21, SJR: 0.314, CiteScore: 0)
American Sociologist     Hybrid Journal   (Followers: 14, SJR: 0.35, CiteScore: 0)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.135, CiteScore: 3)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.211, CiteScore: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 5, SJR: 0.536, CiteScore: 1)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 6)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32, SJR: 0.978, CiteScore: 3)
Anatomical Science Intl.     Hybrid Journal   (Followers: 3, SJR: 0.367, CiteScore: 1)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.177, CiteScore: 5)
Animal Cognition     Hybrid Journal   (Followers: 20, SJR: 1.389, CiteScore: 3)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.192, CiteScore: 0)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.097, CiteScore: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4, SJR: 0.438, CiteScore: 0)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.429, CiteScore: 0)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.197, CiteScore: 1)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 17, SJR: 1.042, CiteScore: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 4, SJR: 0.932, CiteScore: 1)
Annals of Data Science     Hybrid Journal   (Followers: 12)
Annals of Dyslexia     Hybrid Journal   (Followers: 10, SJR: 0.85, CiteScore: 2)
Annals of Finance     Hybrid Journal   (Followers: 31, SJR: 0.579, CiteScore: 1)
Annals of Forest Science     Hybrid Journal   (Followers: 7, SJR: 0.986, CiteScore: 2)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.228, CiteScore: 1)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.043, CiteScore: 2)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.413, CiteScore: 1)
Annals of Microbiology     Hybrid Journal   (Followers: 11, SJR: 0.479, CiteScore: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4, SJR: 0.687, CiteScore: 2)
Annals of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.943, CiteScore: 2)
Annals of Ophthalmology     Hybrid Journal   (Followers: 12)
Annals of Regional Science     Hybrid Journal   (Followers: 8, SJR: 0.614, CiteScore: 1)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 9, SJR: 0.239, CiteScore: 1)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 15, SJR: 1.986, CiteScore: 4)
Annals of Telecommunications     Hybrid Journal   (Followers: 9, SJR: 0.223, CiteScore: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 1.495, CiteScore: 1)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.834, CiteScore: 2)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.22, CiteScore: 3)
APOPTOSIS     Hybrid Journal   (Followers: 9, SJR: 1.424, CiteScore: 4)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.294, CiteScore: 1)
Applications of Mathematics     Hybrid Journal   (Followers: 2, SJR: 0.602, CiteScore: 1)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 44, SJR: 0.571, CiteScore: 2)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 18, SJR: 0.21, CiteScore: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 5, SJR: 0.49, CiteScore: 0)
Applied Composite Materials     Hybrid Journal   (Followers: 49, SJR: 0.58, CiteScore: 2)
Applied Entomology and Zoology     Partially Free   (Followers: 6, SJR: 0.422, CiteScore: 1)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.733, CiteScore: 3)
Applied Geophysics     Hybrid Journal   (Followers: 8, SJR: 0.488, CiteScore: 1)
Applied Intelligence     Hybrid Journal   (Followers: 13, SJR: 0.6, CiteScore: 2)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.319, CiteScore: 1)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 8, SJR: 0.886, CiteScore: 1)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.17, CiteScore: 0)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.461, CiteScore: 1)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 66, SJR: 1.182, CiteScore: 4)
Applied Physics A     Hybrid Journal   (Followers: 10, SJR: 0.481, CiteScore: 2)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 24, SJR: 0.74, CiteScore: 2)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.519, CiteScore: 2)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 12, SJR: 0.316, CiteScore: 1)
Applied Solar Energy     Hybrid Journal   (Followers: 21, SJR: 0.225, CiteScore: 0)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 7, SJR: 0.542, CiteScore: 1)
Aquaculture Intl.     Hybrid Journal   (Followers: 26, SJR: 0.591, CiteScore: 2)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 2)
Aquatic Ecology     Hybrid Journal   (Followers: 36, SJR: 0.656, CiteScore: 2)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.591, CiteScore: 1)
Aquatic Sciences     Hybrid Journal   (Followers: 13, SJR: 1.109, CiteScore: 3)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.303, CiteScore: 1)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 2, SJR: 0.319, CiteScore: 1)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 21, SJR: 1.052, CiteScore: 2)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.224, CiteScore: 0)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.725, CiteScore: 1)
Archival Science     Hybrid Journal   (Followers: 63, SJR: 0.745, CiteScore: 2)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.186, CiteScore: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3, SJR: 0.909, CiteScore: 1)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 3.93, CiteScore: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6, SJR: 0.79, CiteScore: 2)
Archives and Museum Informatics     Hybrid Journal   (Followers: 154, SJR: 0.101, CiteScore: 0)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6, SJR: 1.41, CiteScore: 5)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 1.006, CiteScore: 2)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 14, SJR: 0.773, CiteScore: 2)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 17, SJR: 0.956, CiteScore: 2)
Archives of Microbiology     Hybrid Journal   (Followers: 9, SJR: 0.644, CiteScore: 2)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 9, SJR: 1.146, CiteScore: 2)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 0.71, CiteScore: 2)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 10, SJR: 1.493, CiteScore: 3)
Archives of Toxicology     Hybrid Journal   (Followers: 17, SJR: 1.541, CiteScore: 5)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 0.973, CiteScore: 2)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 15, SJR: 1.274, CiteScore: 3)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 0.946, CiteScore: 3)
ArgoSpine News & J.     Hybrid Journal  
Argumentation     Hybrid Journal   (Followers: 6, SJR: 0.349, CiteScore: 1)
Arid Ecosystems     Hybrid Journal   (Followers: 2, SJR: 0.2, CiteScore: 0)
Arkiv för Matematik     Hybrid Journal   (Followers: 2, SJR: 0.766, CiteScore: 1)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1, SJR: 0.355, CiteScore: 0)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.839, CiteScore: 2)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.131, CiteScore: 0)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 11, SJR: 0.937, CiteScore: 2)
Artificial Intelligence Review     Hybrid Journal   (Followers: 18, SJR: 0.833, CiteScore: 4)
Artificial Life and Robotics     Hybrid Journal   (Followers: 9, SJR: 0.226, CiteScore: 0)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.504, CiteScore: 1)
Asia Pacific Education Review     Hybrid Journal   (Followers: 12, SJR: 0.479, CiteScore: 1)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 16, SJR: 1.185, CiteScore: 2)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 13, SJR: 0.353, CiteScore: 1)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.187, CiteScore: 0)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 19, SJR: 0.855, CiteScore: 1)
Asian Business & Management     Hybrid Journal   (Followers: 9, SJR: 0.378, CiteScore: 1)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 10)
Asian J. of Criminology     Hybrid Journal   (Followers: 6, SJR: 0.543, CiteScore: 1)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 5, SJR: 0.548, CiteScore: 1)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.183, CiteScore: 0)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 22, SJR: 3.385, CiteScore: 5)

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Journal Cover
Aquatic Sciences
Journal Prestige (SJR): 1.109
Citation Impact (citeScore): 3
Number of Followers: 13  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1015-1621 - ISSN (Online) 1420-9055
Published by Springer-Verlag Homepage  [2352 journals]
  • If Alpine streams run dry: the drought memory of benthic communities
    • Authors: Elena Piano; Alberto Doretto; Elisa Falasco; Stefano Fenoglio; Laura Gruppuso; Daniele Nizzoli; Pierluigi Viaroli; Francesca Bona
      Abstract: Several mountain streams are currently changing from perennial to temporary regimes due to increasing water abstraction and global climate change with expected detrimental effects on stream biodiversity and functionality. We here examined whether macroinvertebrates and diatoms, experiencing recurring non-flow periods, showed alterations even after complete flow resumption in 13 mountain streams in SW Italian Alps. Benthic communities were sampled after complete flow resumption in April 2017 in a control section, with permanent flow, and in an intermittent section, which experiences recurrent non-flow periods during summer, in each stream. We tested for differences in terms of taxonomic composition, diversity and functional groups between permanent and temporary sections. Our results showed a significant alteration of benthic invertebrate, but not diatom communities in temporary sections. Different species composition and low diversity values in temporary sections were due to the replacement of monovoltine taxa, with aquatic respiration, preferring medium to fast flowing, oligotrophic waters by plurivoltine taxa, with aerial respiration preferring lentic habitats. Such results provide some insights into the mechanisms by which non-flow periods impact Alpine streams, and further investigations in mountain areas are required in the future to better unravel the repercussions on stream ecosystem processes.
      PubDate: 2019-02-13
      DOI: 10.1007/s00027-019-0629-0
      Issue No: Vol. 81, No. 2 (2019)
       
  • Seasonal variations overwhelm temperature effects on microbial processes
           in headwater streams: insights from a temperate thermal spring
    • Authors: Alice Gossiaux; Jérémy Jabiol; Pascal Poupin; Eric Chauvet; François Guérold
      Abstract: Carbon cycling in headwater streams is mostly driven by the decomposition of allochthonous organic matter, and to a lesser extent by primary production. Quantifying the influence of temperature on these processes is therefore essential to better anticipate the consequences of global warming for stream ecological functioning. In this study, we measured alder litter microbial decomposition and associated fungal biomass and diversity, using leaf discs enclosed in fine-mesh bags along a natural geothermal temperature gradient, in both spring and winter. We monitored the chlorophyll-a accrual in biofilms growing on ceramic tiles. The temperature gradient, from upstream to downstream, ranged from 15.3 to 14.2 °C in spring and 18.2 to 13.2 °C in winter. Autotrophs and heterotrophs exhibited contrasting responses to temperature. The expected positive effect of temperature was actually observed for chlorophyll-a accrual only, while an apparent temperature-independence of litter decomposition rate was found. Moreover, temperature effects on heterotrophic and autotrophic organisms depended on the season, with higher litter decomposition rates, sporulation rates, fungal biomass and chlorophyll-a in spring, despite a lower mean water temperature than in winter. Together, these results suggest that the influence of temperature remained largely overrode by seasonal effects. This result is likely due to annual variations in light availability, and may involve indirect positive interactions between microbial primary producers and decomposers.
      PubDate: 2019-02-11
      DOI: 10.1007/s00027-019-0627-2
      Issue No: Vol. 81, No. 2 (2019)
       
  • Fish feeding groups, food selectivity, and diet shifts associated with
           environmental factors and prey availability along a large subtropical
           river, China
    • Authors: Sai Wang; Jin-Peng Tang; Lin-Hui Su; Jing-Jing Fan; Hao-Yen Chang; Tuan-Tuan Wang; Lin Wang; Hsing-Juh Lin; Yang Yang
      Abstract: Understanding spatial variation in fish trophic structures along large river systems remains a challenge, and the influence of fish food selectivity and diet shifts on these structures remains unknown. In this study, the assemblage composition and stomach contents of fish in the subtropical East River of southern China were analyzed to determine their diet composition (DC) and identify prey-oriented feeding groups. Ten prey items were identified and used to cluster 106 fish species into 23 feeding groups. The number of groups increased longitudinally due to the accumulated emergence of site-specific prey sources in fish DC, although this number decreased sharply near the estuary due to the loss of insectivorous fish. The fish assemblages showed a longitudinal decrease in abundance and an increase in biomass, with higher values observed in the rainy season than the dry season. A downstream decrease in insectivores and epiphytivores and increase in detritivores and molluscivores represented the basic patterns observed along the river. Seven widespread fish species exhibited spatial dietary shifts, among which three generalist feeders with a high abundance notably influenced the fish trophic structures, and four specialist feeders with high food selectivity were significantly (P < 0.05) correlated with prey availability. Multivariate data analysis showed that the flow velocity, water depth, riffle areas, and nutrient concentrations were the key environmental factors that determined the distribution of fish feeding groups, while hydrophytes, plant debris, Ephemeroptera and Odonata insects, and Atyidae shrimp were the key prey sources.
      PubDate: 2019-02-11
      DOI: 10.1007/s00027-019-0628-1
      Issue No: Vol. 81, No. 2 (2019)
       
  • An invasive species, Carassius gibelio , alters the native fish community
           through trophic niche competition
    • Authors: Şükran Yalçın Özdilek; Nurbanu Partal; Roger I. Jones
      Abstract: Carbon and nitrogen stable isotope analyses were used to determine isotopic niche width of the invasive fish species Carassius gibelio to help assess the niche overlap and potential impact of this species on the native fish fauna in the Karamenderes River, northwest Turkey. C. gibelio had the highest niche area of the coexisting species. The greatest overlap of isotopic niche was between C. gibelio and Mugil cephalus in the river mouth. The freshwater species displayed similar patterns when taking into consideration their relative abundance and isotopic overlap. While C. gibelio is likely to outcompete some species at some localities, the species was found co-occurring with others by maximum tolerable overlap degree and apparently utilised vacant niche space at some stations. Overall our results indicate that C. gibelio has extensive niche overlap with the native fish species making it a strong competitor, and because of its high abundance and high niche width this invasive species represents a serious threat to the native fish fauna, particularly in the river mouth.
      PubDate: 2019-02-09
      DOI: 10.1007/s00027-019-0623-6
      Issue No: Vol. 81, No. 2 (2019)
       
  • Correction to: The carbon pump supports high primary production in a
           shallow lake
    • Authors: Mikkel René Andersen; Theis Kragh; Kenneth Thorø Martinsen; Emil Kristensen; Kaj Sand-Jensen
      Abstract: In the original publication, the subscript number 2 were incorrectly added without the subscript format as ‘CO2’ and ‘O2’ in Figs. 4 and 5 legends.
      PubDate: 2019-02-07
      DOI: 10.1007/s00027-019-0625-4
      Issue No: Vol. 81, No. 2 (2019)
       
  • Resolving biogeochemical processes in lakes using remote sensing
    • Authors: Vincent Nouchi; Tiit Kutser; Alfred Wüest; Beat Müller; Daniel Odermatt; Theo Baracchini; Damien Bouffard
      Abstract: Remote sensing helps foster our understanding of inland water processes allowing a synoptic view of water quality parameters. In the context of global monitoring of inland waters, we demonstrate the benefit of combining in-situ water analysis, hydrodynamic modelling and remote sensing for investigating biogeochemical processes. This methodology has the potential to be used at global scales. We take the example of four Landsat-8 scenes acquired by the OLI sensor and MODIS-Aqua imagery over Lake Geneva (France—Switzerland) from spring to early summer 2014. Remotely sensed data suggest a strong temporal and spatial variability during this period. We show that combining the complementary spatial, spectral and temporal resolutions of these sensors allows for a comprehensive characterization of estuarine, littoral and pelagic near-surface features. Moreover, by combining in-situ measurements, biogeochemical analysis and hydrodynamic modelling with remote sensing data, we can link these features to river intrusion and calcite precipitation processes, which regularly occur in late spring or early summer. In this context, we propose a procedure that can be used to monitor whiting events in temperate lakes worldwide.
      PubDate: 2019-01-30
      DOI: 10.1007/s00027-019-0626-3
      Issue No: Vol. 81, No. 2 (2019)
       
  • Floating matter: a neglected component of the ecological integrity of
           rivers
    • Authors: O. Shumilova; K. Tockner; A. M. Gurnell; S. D. Langhans; M. Righetti; A. Lucía; C. Zarfl
      Abstract: Floating matter (FM) is a pivotal, albeit neglected, element along river corridors contributing to their ecological integrity. FM consists of particulate matter of natural (e.g. wood, branches, leaves, seeds) and anthropogenic (e.g. plastic, human waste) origin as well as of organisms that, due to its properties, is able to float on the water surface. In this paper, we provide a comprehensive overview of the FM cycle and the fundamental environmental functions FM provides along rivers. Indeed, FM serves as an important geomorphological agent, a dispersal vector for animals and plant propagules, a habitat, a resource, and a biogeochemical component. Furthermore, we collected data on the amount of FM accumulating at dams and in reservoirs, and related it to key characteristics of the respective catchments. River fragmentation truncates the natural dynamics of FM through its extraction at damming structures, alteration in the flow regime, and low morphological complexity, which may decrease FM retention. Finally, we identify key knowledge gaps in relation to the role FM plays in supporting river integrity, and briefly discuss FM management strategies.
      PubDate: 2019-01-17
      DOI: 10.1007/s00027-019-0619-2
      Issue No: Vol. 81, No. 2 (2019)
       
  • The carbon pump supports high primary production in a shallow lake
    • Authors: Mikkel René Andersen; Theis Kragh; Kenneth Thorø Martinsen; Emil Kristensen; Kaj Sand-Jensen
      Abstract: Aquatic research on primary production and carbon dynamics often ignores calcification that supports photosynthesis by producing protons and forming CO2. Calcification prevents detrimental pH rise, but causes greater decrease of dissolved inorganic carbon (DIC). Concurrent DIC replenishment is therefore essential to maintain high photosynthesis. Here we show a mean daily DIC loss of 40% (26% to photosynthesis and 14% to calcification) in surface waters during summer periods in a shallow charophyte-lake and replenishment of the DIC pool by respiration and carbonate dissolution in the bottom waters followed by nocturnal mixing. The daytime DIC assimilation in organic matter relative to oxygen production in surface waters was close to 1.0 (molar ratio), while total DIC loss markedly exceeded oxygen production because of calcification. Our results suggest that photosynthesis would rapidly become carbon limited if permanent stratification prevented transfer of DIC from bottom waters to surface waters or if permanent mixing prevented CO2 accumulation conducive to carbonate dissolution in bottom waters. This vertical transport of DIC effectively functions as a physical and biological pump supporting high metabolism in charophyte-dominated shallow lakes with recurring daily stratification and mixing.
      PubDate: 2019-01-12
      DOI: 10.1007/s00027-019-0622-7
      Issue No: Vol. 81, No. 2 (2019)
       
  • Burrowing macroinvertebrates alter phosphorus dynamics in drainage ditch
           sediments
    • Authors: Alan W. Leslie; William O. Lamp
      Abstract: Consumptive and nonconsumptive interactions of benthic organisms play important roles in regulating rates of ecosystem services such as nutrient cycling in freshwater ecosystems. Studies of macroinvertebrate communities in drainage ditches have focused on documenting the biodiversity supported by these human-altered environments, but none have explored the ecosystem functions provided by those biological communities in ditches. Bioturbation by burrowing benthic invertebrates in ditch sediments may change rates of biogeochemical processes controlling fluxes of nutrients across the sediment–water interface. We used microcosms to test the effect of four species of burrowing invertebrates (Naididae: Ilyodrilus templetoni, Naididae: Limnodrilus hoffmeisteri, Gammaridae: Crangonyx sp., Chironomidae: Chironomus decorus S.G.) on exchanges of phosphorus between sediment and water from a drainage ditch. These effects were measured across a range of sediment and water characteristics, representing variability within ditches. All species reduced concentrations of P (as molybdenum-reactive phosphorus) in the surface water relative to controls under conditions were sediment porewater was not likely to contain higher concentrations of P than surface water. Decreases in P concentration were linked to changes in the sediment redox potential and water pH. Two species (L. hoffmeisteri and C. decorus) increased P concentrations under conditions where sediment porewater likely had higher concentrations of P than surface water. Increases in P concentrations were likely due to physical changes to the sediment from burrowing, and increased transport of dissolved P from sediment porewater to surface waters. Management of ditches should consider effects of burrowing benthic invertebrates on physical and biogeochemical processes at the sediment–water interface. Habitat manipulation in ditches could lead to unpredicted changes in nutrient dynamics mediated by changes to the burrowing benthic invertebrate community.
      PubDate: 2019-01-11
      DOI: 10.1007/s00027-019-0621-8
      Issue No: Vol. 81, No. 2 (2019)
       
  • Dissolved carbon, greenhouse gases, and δ 13 C dynamics in four estuaries
           across a land use gradient
    • Authors: Arun Looman; Isaac R. Santos; Douglas R. Tait; Jackie Webb; Ceylena Holloway; Damien T. Maher
      Abstract: Land use is a well known driver of nutrient dynamics in estuaries, however less is known about how land use may influence the coastal carbon (C) cycle. Here, we report dissolved carbon concentrations, δ13C isotopic signatures, and water–air CO2 and CH4 fluxes for four Australian estuaries with contrasting catchment land use ranging from 9 to 72% natural. Water samples were collected during dry and wet hydrologic extremes. Dissolved organic carbon (DOC) concentrations were highest and total dissolved nitrogen and dissolved phosphorous were lowest in the least impacted estuary (Pine Creek). The DOC δ13C signature was enriched for the estuary with 91% urban-agricultural land use (Coffs Creek), implying a shift in the source of DOC along the land use gradient. Low DOC and high nutrient availability decreased CO2 fluxes to the atmosphere in the impacted systems during both wet and dry conditions, and increased CH4 concentrations and fluxes during the wet conditions. Variability of CO2 and CH4 were influenced by multiple drivers including hydrologic forcing, dissolved nutrients, as well as shifts in the nature of allochthonous versus autochthonous sources within each estuary.
      PubDate: 2019-01-03
      DOI: 10.1007/s00027-018-0617-9
      Issue No: Vol. 81, No. 1 (2019)
       
  • Interspecific associations between Hydrilla verticillata and three
           dominant native genera of submerged macrophytes are taxa dependent
    • Authors: M. J. Silveira; S. M. Thomaz
      Abstract: Hydrilla verticillata is a submerged macrophyte that has invaded every continent except Antarctica. In this study, we tested the predictions that (i) H. verticillata invades sites with a higher prevalence of native species; (ii) co-occurrences between the invasive and natives depend on their degree of similarity in morphology and resource use and that (iii) native species morphologically similar to H. verticillata decreases in sites colonized by H. verticillata overtime, while occurrences of morphologically dissimilar species increase post-invasion. The incidences of H. verticillata and three taxa of dominant natives were inspected across 87 sites in a reservoir in South Brazil before and after invasion by H. verticillata. The predictions were tested through co-occurrence metrics and logistic regression analyses. The logistic regression indicated that H. verticillata invaded sites independently of the occurrence of dominant natives, but it co-occurred more than expected by chance with the morphologically dissimilar native Characeae species, Nitella sp. and Chara cf. guairensis. On the other hand, Egeria spp. (morphologically similar to H. verticillata) occurrences were not correlated with the presence of H. verticillata. Moreover, the probability of occurrence of Characeae increased significantly overtime in sites invaded by H. verticillata. These results indicate that H. verticillata invaded sites independently of environmental suitability and likely facilitated more dissimilar taxa, such as Characeae, but there was no evidence that it influenced Egeria spp. occurrences. The patches of H. verticillata probably provide favorable habitats for the establishment of Characeae.
      PubDate: 2019-01-02
      DOI: 10.1007/s00027-018-0614-z
      Issue No: Vol. 81, No. 1 (2019)
       
  • A test of top-down control on plant production and nutrient quality in
           low-salinity tidal marshes
    • Authors: Lori A. Sutter; Randy M. Chambers; Madeline Karp; James E. Perry
      Abstract: Herbivory has been shown to play a strong role in controlling primary productivity in tidal salt marshes, but little work has been conducted in low salinity marshes. We measured aboveground plant biomass and nutrient response to insect exclusion along a salinity gradient from tidal freshwater to oligohaline marshes. We expected higher biomass in plants protected from herbivory and more so in the higher salinity marshes where tissue quality was anticipated to improve. Among three marshes along the salinity gradient, aboveground biomass within experimental plots did not vary across control and insect exclosure treatments. Overall tissue quality did not increase with increasing salinity, thus we did not find increasing grazing pressure along that gradient. Tissue N-content in Zizania aquatica (a low-salt tolerant, C3, annual grass) was significantly higher (p < 0.05) in plants within the insect exclosures, and it is the only species of those tested to demonstrate this effect. The lower tissue N-content in controls of this species could be either a response to grazing pressure that disrupts the ability of the plant to develop amino acids or a loss of N through guttation. We found that increasing levels of salt may have little effect on biomass in these marshes, but nutrient dynamics may shift as species like Zizania adjust the pool of tissue N-content.
      PubDate: 2019-01-02
      DOI: 10.1007/s00027-018-0616-x
      Issue No: Vol. 81, No. 1 (2019)
       
  • Architects of the underworld: bioturbation by groundwater invertebrates
           influences aquifer hydraulic properties
    • Authors: Grant C. Hose; Christine Stumpp
      Abstract: The hydraulic properties of aquifers are critical to the storage and transmission of water to meet the needs of an increasingly groundwater-dependent global community. The hydraulic properties of aquifers can also influence the biota present, but inversely, invertebrate burrowing (bioturbation) may also influence the hydraulic properties and the flow of water through sediments. The aim of this study was to test whether groundwater invertebrates were capable of influencing the hydraulic properties of aquifer sediments in an experimental setting. Groundwater amphipods were added to sediment-filled laboratory columns, and the effective porosity (neff) and longitudinal dispersivity (αL) of the sediments were compared before and after 2 months of amphipod activity. The neff of columns without amphipods decreased significantly over time whereas in columns containing eight amphipods it remained relatively constant, and in columns with four amphipods it was highly variable. There was no difference in αL between columns with amphipod density or over time. These findings suggest that the amphipods were maintaining the amount of pore space that was actively contributing to transport but their activity was not influencing the distribution of flow paths, and amphipod density is critical to causing or maintaining changes in hydraulic properties.
      PubDate: 2019-01-02
      DOI: 10.1007/s00027-018-0613-0
      Issue No: Vol. 81, No. 1 (2019)
       
  • Flow-divergence feedbacks control propagule retention by in-stream
           vegetation: the importance of spatial patterns for facilitation
    • Authors: Loreta Cornacchia; Daphne van der Wal; Johan van de Koppel; Sara Puijalon; Geraldene Wharton; Tjeerd J. Bouma
      Abstract: Facilitation (enhancement of propagule retention in this case) is increasingly recognized as an important driver of biodiversity, but it is still unknown if facilitation during dispersal and colonization is affected by self-organized spatial pattern formation. We investigated the ability of in-stream submerged macrophyte patches to trap the vegetative propagules of three species (Berula erecta, Groenlandia densa, Elodea nuttallii in two size classes: 13–22 and 40–48 cm long), and to potentially benefit the colonization of these three species. We tested the effects of propagule traits, hydrodynamic forcing, and spatial patch configuration on propagule trapping. Propagule buoyancy was negatively correlated with trapping chance, while propagule size did not influence trapping. Species-specific differences in buoyancy were maintained for weeks after fragmentation. Propagule retention was interactive and conditional upon the interplay between incoming flow velocities and vegetation spatial patterning. In the flume experiment at low flows, a patchy configuration (one patch filling 66% of the flume width) retained more surface-drifting propagules (B. erecta, G. densa), than near-homogeneous cover (two patches close together, filling the entire flume width). In contrast, retention of sinking E. nuttallii propagules increased in the two-patch configurations. In flume and field releases where patches did not completely fill the channel width, water flowed around the patches rather than over or through them. This resulted in low-flow velocity areas within patches where canopies were upright and propagules were retained, and higher velocity flows around patches. In contrast, when vegetation filled the channel width, water could not be diverted laterally around the patches and preferentially flowed over them, causing the canopies to bend and reduce their trapping capacity. In flume experiments at high flows, retention of all species decreased, regardless of vegetation configuration, as propagules passed over the reconfigured vegetation canopies. These findings on the interplay of water movement and patch reconfiguration suggest that environmental heterogeneity generated by the self-organizing behavior of aquatic plants might enhance colonization of sessile organisms, calling for landscape-scale processes like dispersal to be better investigated.
      PubDate: 2019-01-02
      DOI: 10.1007/s00027-018-0612-1
      Issue No: Vol. 81, No. 1 (2019)
       
  • Predicting internal phosphorus loading in stratified lakes
    • Authors: M. L. Ostrofsky; R. M. Marbach
      Abstract: The ability to predict internal phosphorus loading in stratified lakes has been given new urgency by the realization that traditional best management practices to control external loading have limited effectiveness. We tested the hypothesis that lake sediments with molar Al:Fe ratios greater than 3 would release very little P (Kopáček et al., Environ Sci Technol 39:8784–8789, 2005). We fractionated operationally-defined species of phosphorus, aluminum, and iron in the profundal sediments from a diverse collection of lakes, and sought predictive relationships with previously determined phosphorus release rates from these same sediments. Our results suggest that sediments with Al:Fe molar ratios greater than 3 release negligible amounts P, and that in sediments with Al:Fe ratios less than 3, P release is significantly correlated with the concentrations of reductant-extractible P and the contribution (%) of NaOH-extractible P. We constructed a decision tree model to enable lake managers to anticipate the magnitude of internal P loads in lakes undergoing increased watershed development or changes in thermal stratification and subsequent anoxia due to climate change.
      PubDate: 2019-01-02
      DOI: 10.1007/s00027-018-0618-8
      Issue No: Vol. 81, No. 1 (2019)
       
  • Comparison of fluorometric and microscopical quantification of
           phytoplankton in a drinking water reservoir by a one-season monitoring
           program
    • Authors: A. Hartmann; H. Horn; I. Röske; K. Röske
      Abstract: Phytoplankton are key components in aquatic ecosystems and therefore an important target of monitoring analyses. Microscopical counting, although providing most detailed results, is time and labor intensive and requires highly skilled analysts. In situ spectral fluorescence measurements provide a much faster analysis with a higher spatiotemporal resolution. A one-season survey of phytoplankton assemblages was performed in order to compare the results of the spectrofluorometric measurements to classical microscopical determination in different sections of a drinking water reservoir. The investigations were performed with the spectrofluorometer FluoroProbe (FP) by bbe Moldaenke GmbH (Kiel, Germany), which is designed to discriminate among diatoms, green algae, Cryptophyta and cyanobacteria. The results of phytoplankton quantification as revealed by total chlorophyll a (Chla) measurements with the FP and total biovolumes determined by microscopy showed a good correlation.The accordance between the two approaches was best for diatoms and much lower for the other spectral groups. The proportion of green algae was generally overestimated by FP measurements in comparison to biovolumes. Contrary, the percentage of cyanobacteria was often underestimated by FP compared to microscopical analyses. A clear underestimation of cyanobacteria by FP measurements even at high abundances of Microcystis sp. was observed in two samples. No influence of species composition on the congruence between microscopical analyses and FP measurements was detected.
      PubDate: 2019-01-02
      DOI: 10.1007/s00027-018-0608-x
      Issue No: Vol. 81, No. 1 (2019)
       
  • Gradients in fish feeding guilds along a reservoir cascade
    • Authors: L. E. Miranda; Rafaela V. Granzotti; Daniel J. Dembkowski
      Abstract: The river continuum concept predicts a longitudinal gradient in the structure and functioning of rivers. Impoundments potentially change this continuum by reorganizing nutrient transport and storage in the system. To determine if predictions made by the river continuum concept relative to fish assemblage trophic structure hold for a temperate river transformed into a reservoir cascade, we examined longitudinal trends in the distribution of biomass among feeding guilds over 30 reservoirs of the Tennessee River (USA). Fish assemblages were sampled over a 12-year period, and fishes were classified as detritivores, herbivores, invertivores, piscivores, or planktivores. Biomass of all feeding guilds increased with catchment area (i.e., in a downstream direction). However, representation of herbivores and planktivores within the fish assemblage, as indexed by percent biomass composition, increased with catchment area, whereas representation of detritivores, invertivores, and piscivores decreased. In general, the predictions made by the river continuum concept apply to the Tennessee River reservoir cascade despite the major environmental transformation caused by the series of impoundments. However, transformation of lotic into lentic systems promotes autochthonous primary production and proliferation of herbivores and planktivores that reduces relative representation of other guilds.
      PubDate: 2019-01-02
      DOI: 10.1007/s00027-018-0615-y
      Issue No: Vol. 81, No. 1 (2019)
       
  • Integrating catchment land cover data to remotely assess freshwater
           quality: a step forward in heterogeneity analysis of river networks
    • Abstract: Attempts to obtain information from geospatial data in freshwater ecology is a highly challenging task requiring the development of new concepts and adequate tools. Conventionally, river networks are represented as collections of vectors, but they can also be thought of as a succession of raster cells corresponding to the digital elevation model of the landscape they traverse. Based on the principle that each cell in the river raster collects environmental influences from its upstream drainage basin, we defined a remote measure of the potential of pollution named RWQ (Remote Water Quality). We used the CORINE Land Cover categories found in the catchment area of each cell in the river network grouped by ecological relevance and weighted by their respective areas in the catchment. To refine the index to account for the proximity of potential pollution sources, we tested successive buffers of 1 km up to the full catchment of each investigated point, concluding that the RWQ calculated for the full catchment is the most suitable index. For implementation, we developed RIVERenhancer, a free Python-based ArcGIS tool making possible the enhancement of raster river networks with data extracted from various files. The reliability of RWQ was tested with the aid of in situ measurements of chemical and biological water quality obtained from several sources in Danube basin (Romania and Hungary). The strong correlation with field data shows that this index can be considered a surrogate to depict the quality of freshwater habitats and to analyse network heterogeneity. The strength of this concept comes from taking advantage of the dendritic nature of river networks, opening new directions of operations for large scale approaches concerning important issues in global ecology, biogeography and conservation.
      PubDate: 2019-01-23
      DOI: 10.1007/s00027-019-0624-5
       
  • Sinkholes as a source of life in the Dead Sea region
    • Authors: Ofir Hirshberg; Frida Ben-Ami
      Abstract: In recent decades, the Dead Sea region has suffered greatly from anthropogenic activities that have resulted in a massive decrease of the Dead Sea water level. This decrease has allowed the penetration of fresh ground water into the underground layer, which dissolved the salt layer and created sinkholes. Presently there are over 5000 sinkholes spread across the west bank of the Dead Sea, some of which are filled with water originating from rainfall, flash floods and spring water. Although sinkholes are detrimental to road infrastructure and tourist sites, they have dramatically increased the number of aquatic habitats surrounding the Dead Sea. In a cross-sectional study of 94 sinkholes along the north-west bank of the Dead Sea, coupled with a longitudinal study of six sinkholes, we examined how the community of invertebrates in the sinkholes is affected by environmental and geographic variables and how biological succession occurs in the sinkholes. We found that sinkholes are populated mainly by aquatic insects, which have high tolerance of a variety of environmental conditions. We also found that the community of invertebrates in the sinkholes is shaped by environmental variables such as salinity, pH, dissolved oxygen concentration, water temperature and the size of the sinkhole. We further found that the geographic distance between the sinkholes increases spatial species turnover and that species turnover across time was high. Patterns of species composition were similar in all the sinkholes, with the community structure during the wet season changing from early to mid-season, and then again from mid-season to late season. Interestingly, despite the extreme conditions of the water of the sinkholes, their seasonal succession processes were similar to those of temporary water bodies along the Mediterranean coast of Israel.
      PubDate: 2018-12-19
      DOI: 10.1007/s00027-018-0611-2
      Issue No: Vol. 81, No. 1 (2018)
       
  • Respiration and aeration by bioturbating Tubificidae alter biogeochemical
           processes in aquatic sediment
    • Authors: Rémon M. Saaltink; Eldin Honingh; Stefan C. Dekker; Jasper Griffioen; Mariëlle C. van Riel; Piet F. M. Verdonschot; Jos P. M. Vink; Johan C. Winterwerp; Martin J. Wassen
      Abstract: This study investigates the potential of bioturbating Tubificidae to alter biogeochemical processes by sediment aeration in order to enhance ecosystem development in eco-engineering projects. We introduced Tubificidae in three different densities (5000, 15,000, and 30,000 individuals m−2) in clay-rich sediment from lake Markermeer (The Netherlands). Redox potential, nutrients and major elements were measured from the water column and porewater at different depths. Mineral phase and redox transfers were chemically modelled and oxygen concentrations in bioturbated sediments for each density were mathematically predicted. The measured results of this experiment showed that Tubificidae oxygenated the upper 15 mm of the sediment. This resulted in decomposition of sedimentary organic matter with an associated sixfold increase in NH4 and NOx concentrations in the porewater and the water column. However, phosphorus concentrations were declining in the upper 16 mm, likely as a result of immobilization by pyrite oxidation and production of iron oxides. These bioturbation effects were highest in the treatment with an intermediate density of Tubificidae (15,000 worms m−2) as aeration effects in the treatment with the highest density of Tubificidae (30,000 worms m−2) was impeded by high respiration rates. Furthermore, with a two dimensional diffusion model, simulated effects of respiration and aeration on the oxygen concentration in the sediment suggest that the bioturbation effect is strongest at a density of 12,000 worms m−2. In ecological engineering projects where fast ecosystem development is important, introducing Tubificidae to aquatic sediments to optimal densities might enhance initial ecosystem development due to improved availability of nitrogen as nutrient.
      PubDate: 2018-12-19
      DOI: 10.1007/s00027-018-0610-3
      Issue No: Vol. 81, No. 1 (2018)
       
 
 
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