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Publisher: Springer-Verlag (Total: 2355 journals)

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Showing 1 - 200 of 2355 Journals sorted alphabetically
3D Research     Hybrid Journal   (Followers: 19, SJR: 0.214, h-index: 10)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 1.073, h-index: 25)
AAPS J.     Hybrid Journal   (Followers: 21, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 6, SJR: 0.718, h-index: 54)
Abdominal Imaging     Hybrid Journal   (Followers: 14, SJR: 0.723, h-index: 60)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3, SJR: 0.447, h-index: 12)
Academic Psychiatry     Full-text available via subscription   (Followers: 23, SJR: 0.492, h-index: 32)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.135, h-index: 6)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26, SJR: 0.378, h-index: 30)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.355, h-index: 20)
Acoustics Australia     Hybrid Journal  
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.387, h-index: 6)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.624, h-index: 34)
Acta Biotheoretica     Hybrid Journal   (Followers: 5, SJR: 0.419, h-index: 25)
Acta Diabetologica     Hybrid Journal   (Followers: 13, SJR: 1.318, h-index: 46)
Acta Endoscopica     Hybrid Journal   (Followers: 1, SJR: 0.113, h-index: 8)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.465, h-index: 23)
Acta Geochimica     Hybrid Journal   (Followers: 6)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 2, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 11, SJR: 8.021, h-index: 47)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.53, h-index: 29)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.406, h-index: 30)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.451, h-index: 5)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.22, h-index: 20)
Acta Mechanica     Hybrid Journal   (Followers: 20, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.426, h-index: 29)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5, SJR: 0.525, h-index: 18)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.524, h-index: 14)
Acta Neurochirurgica     Hybrid Journal   (Followers: 6, SJR: 0.833, h-index: 73)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 1, SJR: 0.348, h-index: 27)
Acta Neuropathologica     Hybrid Journal   (Followers: 5, SJR: 6.61, h-index: 117)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.295, h-index: 17)
Acta Parasitologica     Hybrid Journal   (Followers: 9, SJR: 0.581, h-index: 28)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 2, SJR: 0.551, h-index: 39)
Acta Politica     Hybrid Journal   (Followers: 13, SJR: 0.658, h-index: 20)
Activitas Nervosa Superior     Hybrid Journal  
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5, SJR: 0.103, h-index: 4)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 22, SJR: 0.871, h-index: 15)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 15, SJR: 0.795, h-index: 40)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.774, h-index: 52)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3, SJR: 0.319, h-index: 15)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 34, SJR: 0.959, h-index: 44)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15, SJR: 1.255, h-index: 44)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52, SJR: 1.113, h-index: 14)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.141, h-index: 3)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 25, SJR: 1.397, h-index: 42)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.2, h-index: 4)
Advances in Polymer Science     Hybrid Journal   (Followers: 41, SJR: 0.637, h-index: 89)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 0.79, h-index: 44)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.882, h-index: 23)
Aerobiologia     Hybrid Journal   (Followers: 2, SJR: 0.511, h-index: 36)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 9, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 16, SJR: 0.612, h-index: 24)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.248, h-index: 6)
AGE     Hybrid Journal   (Followers: 7, SJR: 1.358, h-index: 33)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.337, h-index: 10)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.529, h-index: 55)
Agricultural Research     Hybrid Journal   (Followers: 3)
Agriculture and Human Values     Hybrid Journal   (Followers: 13, SJR: 1.197, h-index: 49)
Agroforestry Systems     Hybrid Journal   (Followers: 19, SJR: 0.64, h-index: 56)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 10, SJR: 1.732, h-index: 59)
AI & Society     Hybrid Journal   (Followers: 6, SJR: 0.171, h-index: 19)
AIDS and Behavior     Hybrid Journal   (Followers: 13, SJR: 2.006, h-index: 71)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.706, h-index: 19)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 4, SJR: 0.566, h-index: 18)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.388, h-index: 22)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 0.868, h-index: 20)
Algorithmica     Hybrid Journal   (Followers: 8, SJR: 0.898, h-index: 56)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.183, h-index: 20)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 0.729, h-index: 20)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3, SJR: 1.392, h-index: 32)
AMBIO     Hybrid Journal   (Followers: 15, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 15, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 25, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 8, SJR: 0.634, h-index: 13)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 15, SJR: 0.283, h-index: 3)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.175, h-index: 13)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.558, h-index: 35)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 22, SJR: 0.293, h-index: 13)
American Sociologist     Hybrid Journal   (Followers: 14, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.362, h-index: 83)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.21, h-index: 37)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 5)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 30, SJR: 1.096, h-index: 123)
Anatomical Science Intl.     Hybrid Journal   (Followers: 2, SJR: 0.301, h-index: 26)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.212, h-index: 69)
Animal Cognition     Hybrid Journal   (Followers: 16, SJR: 1.122, h-index: 55)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.156, h-index: 4)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.377, h-index: 32)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.504, h-index: 14)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.167, h-index: 26)
Annals of Behavioral Medicine     Hybrid Journal   (Followers: 12, SJR: 2.112, h-index: 98)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18, SJR: 1.182, h-index: 94)
Annals of Combinatorics     Hybrid Journal   (Followers: 3, SJR: 0.849, h-index: 15)
Annals of Data Science     Hybrid Journal   (Followers: 11)
Annals of Dyslexia     Hybrid Journal   (Followers: 10, SJR: 0.857, h-index: 40)
Annals of Finance     Hybrid Journal   (Followers: 28, SJR: 0.686, h-index: 14)
Annals of Forest Science     Hybrid Journal   (Followers: 6, SJR: 0.929, h-index: 57)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.136, h-index: 23)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.117, h-index: 62)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 8, SJR: 0.593, h-index: 42)
Annals of Microbiology     Hybrid Journal   (Followers: 10, SJR: 0.402, h-index: 26)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5, SJR: 0.68, h-index: 45)
Annals of Operations Research     Hybrid Journal   (Followers: 10, SJR: 1.186, h-index: 78)
Annals of Ophthalmology     Hybrid Journal   (Followers: 12)
Annals of Regional Science     Hybrid Journal   (Followers: 8, SJR: 0.405, h-index: 42)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 10, SJR: 0.553, h-index: 8)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 14, SJR: 1.902, h-index: 127)
Annals of Telecommunications     Hybrid Journal   (Followers: 7, SJR: 0.315, h-index: 25)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.931, h-index: 31)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.992, h-index: 87)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.14, h-index: 57)
APOPTOSIS     Hybrid Journal   (Followers: 8, SJR: 1.554, h-index: 87)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.354, h-index: 27)
Applications of Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.274, h-index: 20)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 42, SJR: 0.575, h-index: 80)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 16, SJR: 0.267, h-index: 26)
Applied Cancer Research     Open Access  
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 48, SJR: 0.705, h-index: 35)
Applied Entomology and Zoology     Partially Free   (Followers: 3, SJR: 0.554, h-index: 34)
Applied Geomatics     Hybrid Journal   (Followers: 4, SJR: 0.323, h-index: 9)
Applied Geophysics     Hybrid Journal   (Followers: 8, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 11, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.358, h-index: 34)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4, SJR: 0.955, h-index: 33)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.275, h-index: 8)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.37, h-index: 26)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 61, SJR: 1.262, h-index: 161)
Applied Physics A     Hybrid Journal   (Followers: 7, SJR: 0.535, h-index: 121)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 23, SJR: 0.983, h-index: 104)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.677, h-index: 47)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 11, SJR: 0.288, h-index: 15)
Applied Solar Energy     Hybrid Journal   (Followers: 17, SJR: 0.251, h-index: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5, SJR: 0.351, h-index: 9)
Aquaculture Intl.     Hybrid Journal   (Followers: 22, SJR: 0.613, h-index: 40)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 1)
Aquatic Ecology     Hybrid Journal   (Followers: 32, SJR: 0.646, h-index: 44)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.764, h-index: 39)
Aquatic Sciences     Hybrid Journal   (Followers: 13, SJR: 1.172, h-index: 53)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.345, h-index: 20)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 1, SJR: 0.417, h-index: 16)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 23, SJR: 1.056, h-index: 15)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.397, h-index: 13)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.597, h-index: 29)
Archival Science     Hybrid Journal   (Followers: 56, SJR: 0.804, h-index: 22)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 8, SJR: 0.28, h-index: 15)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1, SJR: 0.946, h-index: 23)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 4.091, h-index: 66)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.865, h-index: 40)
Archives and Museum Informatics     Hybrid Journal   (Followers: 132)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4, SJR: 2.841, h-index: 40)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 0.9, h-index: 65)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 12, SJR: 0.846, h-index: 84)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 17, SJR: 0.695, h-index: 47)
Archives of Microbiology     Hybrid Journal   (Followers: 8, SJR: 0.702, h-index: 85)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 56)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 1.092, h-index: 13)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 10, SJR: 1.198, h-index: 74)
Archives of Toxicology     Hybrid Journal   (Followers: 17, SJR: 1.595, h-index: 76)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 1.086, h-index: 90)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 14, SJR: 1.264, h-index: 50)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 1.2, h-index: 42)
ArgoSpine News & J.     Hybrid Journal   (SJR: 0.102, h-index: 3)
Argumentation     Hybrid Journal   (Followers: 5, SJR: 0.295, h-index: 18)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.948, h-index: 22)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.797, h-index: 17)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.145, h-index: 8)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 11, SJR: 0.288, h-index: 25)
Artificial Intelligence Review     Hybrid Journal   (Followers: 14, SJR: 0.948, h-index: 48)
Artificial Life and Robotics     Hybrid Journal   (Followers: 8, SJR: 0.231, h-index: 14)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.247, h-index: 9)
Asia Pacific Education Review     Hybrid Journal   (Followers: 12, SJR: 0.371, h-index: 17)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 16, SJR: 1.676, h-index: 50)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 12, SJR: 0.353, h-index: 13)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.19, h-index: 15)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 20, SJR: 1.006, h-index: 14)
Asian Business & Management     Hybrid Journal   (Followers: 8, SJR: 0.41, h-index: 10)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 7)
Asian J. of Criminology     Hybrid Journal   (Followers: 5, SJR: 0.263, h-index: 8)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 2, SJR: 0.681, h-index: 15)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.195, h-index: 5)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  

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Journal Cover Aquatic Sciences
  [SJR: 1.172]   [H-I: 53]   [13 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1015-1621 - ISSN (Online) 1420-9055
   Published by Springer-Verlag Homepage  [2355 journals]
  • Effects of turbulence exposure on zebra mussel ( Dreissena polymorpha )
           larval survival
    • Authors: J. L. Kozarek; M. Hondzo; M. E. Kjelland; C. D. Piercy; T. M. Swannack
      Abstract: Abstract To more accurately predict recruitment of zebra mussels (Dreissena polymorpha) in waterbodies downstream of a source population, factors that control the successful transport of zebra mussel larvae need to be quantified. Turbulence has been identified in previous studies as a likely factor in larval morality in rivers and streams where turbulent energy dissipation can be orders of magnitude greater than in lakes. To investigate the impact of turbulent energy dissipation on zebra mussel larval mortality, we conducted a series of experiments using lake water collected from Lake Minnetonka, Minnesota containing veligers in a jar test device. Results indicate that zebra mussel larval mortality is a function of veliger size, turbulent energy dissipation, and exposure time. The mortality at 24 h of turbulence exposure was fit to a function of d*, the ratio of shell size to Kolmogorov length scale, to develop a dose–response curve. Mortality rate constants were estimated by fitting mortality data from specified turbulence regimes to a first-order model. The mortality rates ranged from 0.09 to 1.71 day−1 and were correlated to energy dissipation.
      PubDate: 2018-01-05
      DOI: 10.1007/s00027-017-0563-y
      Issue No: Vol. 80, No. 1 (2018)
       
  • Open-channel measurement of denitrification in a large lowland river
    • Authors: Stephanie Ritz; Kirstin Dähnke; Helmut Fischer
      Abstract: Abstract Denitrification is considered to be the most important pathway removing nitrogen from terrestrial and freshwater ecosystems. However, field studies that quantify this process under in situ conditions are sparse, especially in large rivers. Here, we measured N2, the end product of denitrification, directly in the water column of a large 8th order lowland river (Elbe, Germany) using N2/Ar ratios measured by Membrane Inlet Mass Spectrometry (MIMS). Denitrification was calculated according to the open-channel two-station approach based on Lagrangian sampling along a 580 km long, mostly free flowing river section. Gas exchange was computed by several empirical equations to bound uncertainty in air–water exchange and the resulting fluxes were used to estimate ranges in N2-production. In summer 2011 and spring 2012, we found slight but distinct N2 super saturations in the river water averaging 2.8 and 3.5 µM, respectively. Denitrification rates averaged 18 and 13 mg N m− 2 h− 1 for summer 2011 and spring 2012, respectively. On an annual cycle this corresponds to a nitrogen removal of 10,000 t N year− 1 that is 10% of the total N inputs along the studied river section. These results show that large rivers can remove large amounts of nitrogen during downstream transport and demonstrate that the open-channel N2 method provides a valuable tool to study in situ denitrification not only in small, but also in large rivers.
      PubDate: 2017-12-20
      DOI: 10.1007/s00027-017-0560-1
      Issue No: Vol. 80, No. 1 (2017)
       
  • Fate of juvenile salmonids stranded in off-channel pools: implications for
           nutrient transfers
    • Authors: Richard H. Walker; Bryan M. Maitland; Tayler N. LaSharr; Michael N. Rosing; Merav Ben-David
      Abstract: Abstract Fish stranding is a complex phenomenon largely attributed to anthropogenic causes in regulated rivers. Although our knowledge of the frequency of stranding and fate of stranded fish in unregulated rivers is limited, this phenomenon may be widespread and important for the transfer of nutrients from aquatic to terrestrial ecosystems. Using a combination of observational data, an experimental manipulation, and a nitrogen subsidy model, we investigated the fate and implications of fish stranded in off-channel pools created by the last spring flood, in the Kadashan River watershed on Chichagof Island, Alaska, USA. Of fish stranded in pools (exclusively juvenile Dolly Varden Char [Salvelinus malma] and Coho Salmon [Oncorhynchus kisutch]), smaller individuals (age-0; < 74 mm) were more common than larger ones (age-1; > 74 mm). Mortality rate was mainly influenced by cover availability, and larger fish tended to disappear at a higher rate than smaller ones. These observations, together with detection of predator activity, suggest that predation was the main cause of mortality for stranded fish. We estimate that fish stranding occurred during 66% of the years between 1980 and 2015, and that in a single stranding event approximately 1.62 kg of nitrogen is available to predators in the 0.24 km2 floodplain of the Kadashan watershed surveyed. Thus, fish stranding likely has implications for cross ecosystem connectivity via aquatic nutrient transfers to terrestrial food webs. With projected increases in extreme precipitation and flood events in Southeast Alaska the incidence of fish stranding in unregulated rivers will likely increase. Our results suggest by ensuring that cover (e.g. large wood and artificial structures) is available in off-channel habitats to benefit species or populations of conservation concern.
      PubDate: 2017-12-14
      DOI: 10.1007/s00027-017-0562-z
      Issue No: Vol. 80, No. 1 (2017)
       
  • Effects of inundation and stranding on leaf litter decomposition and
           chemical transformation
    • Authors: Junqiang Zheng; Yuzhe Wang; Chengrong Chen; Qi Jiang; Shijie Han; Zhihong Xu
      Abstract: Abstract Inundation and stranding are important processes of the riparian ecosystem due to water level fluctuation. Plant litter decomposition is a key process that determines the accumulation of soil organic matter in riparian ecosystems, but little is known about the alternating effects of inundation and stranding on this process. Using litters of the grass species Heteropogon contortus, we studied how the remaining mass and nitrogen (N), δ13C and δ15N, and 13C-CPMAS NMR spectra responded to permanent inundation, temporary inundation and drying over a period of twelve months. Inundation (permanent or temporary) and stranding altered litter C and N dynamics. The δ13C declined in the immersed litters and was stable after the litters were transported to the grassland plots, while δ15N in the litters that were decomposing continually in the water rapidly increased during the earlier stage of decomposition. We observed a significant increase in the proportion of ketone, carboxyl, and alkyl in the permanently inundated litter samples compared with those of litters decomposed at terrestrial habitats at the final harvest. These results indicated that the effects of inundation on the decay of labile and recalcitrant litter components were asynchronous. The decomposing litters in the inundation treatment differed chemically from those in the terrestrial habitat treatments and were characterized by greater relative abundances of ketone C and carboxyl C. The higher values of alkyl/O-alkyl for the stranding litters that had higher mass remaining and C/N as compared to those of inundated litters that had lower mass remaining and C/N in the final harvest, suggested a relatively higher contribution of the recalcitrant components to the litter residues. Likewise, the effects of transient inundation depend on the timing of immersion and stranding.
      PubDate: 2017-12-04
      DOI: 10.1007/s00027-017-0561-0
      Issue No: Vol. 80, No. 1 (2017)
       
  • The potential of Earth Observation in modelling nutrient loading and water
           quality in lakes of southern Québec, Canada
    • Authors: Eirini Politi; Yves T. Prairie
      Abstract: Abstract Phosphorus and nitrogen are key nutrients that affect abundance and growth of aquatic primary producers but cannot be directly remotely sensed as their dissolved or organic forms do not interact with the remote sensing signal. In addition, other lake water quality variables such as chlorophyll a and Secchi disk depth, have been previously successfully estimated with remote sensing, but the retrieval algorithms are site-, season-, and/or scene-specific. Such algorithms do not take into account lake typological features, which can affect the sensitivity of lake to change, or catchment characteristics, for example, land cover that is a major driver of lake water quality change. Here we propose a novel approach that utilises remotely sensed land cover information in the catchment to estimate phosphorus, nitrogen and chlorophyll a concentrations in lake waters. We use land cover type-specific nutrient export coefficients and the NASA MODIS (Moderate Resolution Imaging Spectroradiometer) Land Cover Type product showing that nutrient loading based on remote sensing can explain up to 75% of variability in lake nutrient concentrations and 58% of variability in lake chlorophyll a concentrations. In addition, we show that land cover information, supplemented by satellite measurements and lake morphometry data are good predictors of chlorophyll a (R2 = 0.77) and Secchi disk depth (R2 = 0.87) in lakes with different trophic statuses and in different months and years.
      PubDate: 2017-12-04
      DOI: 10.1007/s00027-017-0559-7
      Issue No: Vol. 80, No. 1 (2017)
       
  • Does the Tachet trait database report voltinism variability of aquatic
           insects between Mediterranean and Scandinavian regions'
    • Authors: Núria Bonada; Sylvain Dolédec
      Abstract: Abstract Labile traits are those that are not constrained by phylogeny and should respond directly to the environment through local adaptation or phenotypic plasticity. For example, voltinism (number of generations per year) is a labile trait that has been consistently related to latitude and, in particular, to temperature and photoperiod changes. Current trait databases include several labile traits that, at best, are coarsely coded to include potential intraspecific trait variability obtained from different literature sources. Given that these databases are used across large regions with contrasting environmental conditions or in small regions with particular environmental conditions, the reliability of these studies could be compromised at least for labile traits because of interpopulation variability. Based on a review of the literature on the life cycles of 317 aquatic insect species, we compared their types of voltinism in two regions with contrasting environmental conditions (the Mediterranean Basin and Scandinavia) with the information published by Tachet et al. (Invertébrés d’eau douce: systématique, biologie, écologie, 3rd edn. CNRS Éditions, Paris, 2010) (i.e., potential number of generations per year). We found the expected higher prevalence of multivoltine life cycles in the Mediterranean Basin, whereas univoltine and semivoltine life cycles showed trends of prominence in Scandinavia. In addition, the life-cycle profiles of the genera included in the Tachet et al. database (hereafter TAC) were situated between those found in the Mediterranean Basin and Scandinavia, suggesting that this database properly represents voltinism variability across Europe. However, the use of this database exclusively for the northern or southern regions may be challenging because TAC is not able to accurately represent the life cycles of the species in these regions, especially for univoltine and multivoltine species. Future studies in stream ecology should thus put efforts into quantifying and understanding the role of intra-taxon trait variability in community assembly, at least for labile traits, to better understand trait-environment relationships.
      PubDate: 2017-11-24
      DOI: 10.1007/s00027-017-0554-z
      Issue No: Vol. 80, No. 1 (2017)
       
  • Flow-velocity-dependent effects of turbid water on periphyton structure
           and function in flowing water
    • Authors: Terutaka Mori; Yukio Miyagawa; Yukio Onoda; Yuichi Kayaba
      Abstract: Abstract Land-use change, human activities, and dam management supply highly turbid water with high flow velocity; however, little is known about its effect on river ecosystems. Here, we studied the effects of flow velocity and suspended silt concentration on periphyton structure and function using experimental channels. The effects of flow velocity on algal biomass in the periphyton community depended on the suspended silt concentration; flow velocity decreased chlorophyll a in low concentrations of suspended silt (clear water), but not in moderate or high concentrations (turbid water). Filamentous cyanobacteria density was significantly influenced by flow velocity, whereas densities of non-filamentous cyanobacteria, green algae, and diatoms were not. Thus, flushing effects on attached algae, especially filamentous cyanobacteria, were exerted in clear but not in turbid waters, perhaps because algal assemblages were resistant to water current through the binding of large amounts of silt by extracellular polymeric substances. Inorganic matter and its ratio in the periphyton community decreased with flow velocity, but increased with suspended silt concentration, irrespective of flow velocity. Periphyton function, assessed by maximum photosynthesis rates and light-use efficiency, was influenced by flow velocity and suspended silt concentration through changes in periphyton structure. Flood events would be expected to refresh the periphyton community by removing senescent algae and deposited fine particles. However, we demonstrated that algae and silt in the periphyton community exposed to turbid waters with human-induced silt may accumulate, irrespective of flow velocity.
      PubDate: 2017-11-22
      DOI: 10.1007/s00027-017-0552-1
      Issue No: Vol. 80, No. 1 (2017)
       
  • Effects of small-scale turbulence on growth and grazing of marine
           microzooplankton
    • Authors: Rodrigo A. Martínez; Albert Calbet; Enric Saiz
      Abstract: Abstract We report the effects of small-scale turbulence at realistic intensity (ε = 1.1 × 10−2 cm2 s−3) on the growth and grazing rates of three marine heterotrophic dinoflagellates (Peridiniella danica, Gyrodinium dominans and Oxyrrhis marina) and one ciliate (Mesodinium pulex). All the dinoflagellates showed a reduction of volume-based growth rates, whereas M. pulex did not. P. danica was the most affected by small-scale turbulence, followed by G. dominans, and O. marina. Turbulence slightly increased O. marina ingestion rates, but this increase was not statistically significant. G. dominans and M. pulex ingestion rates were modestly lower under turbulence, and P. danica completely ceased feeding in turbulent treatments. Gross growth efficiencies of G. dominans and O. marina were negatively affected by turbulence, whereas they remained unaltered for M. pulex. P. danica feeding and growth rates in the presence of turbulence were close to zero. Overall, there was a negative relationship between the effects of turbulence on ingestion rates and the time needed to process a prey item. Neglecting the effects of turbulence in microzooplankton grazing estimates in the field could produce biased approximations of their impacts on primary producers.
      PubDate: 2017-11-21
      DOI: 10.1007/s00027-017-0558-8
      Issue No: Vol. 80, No. 1 (2017)
       
  • Modeling hydrologic connectivity and virtual fish movement across a large
           Southeastern floodplain, USA
    • Authors: Kimberly M. Meitzen; John A. Kupfer; Peng Gao
      Abstract: Abstract Lateral hydrologic connectivity between a river and its floodplain is important for exchanges of organisms and materials that support healthy, functioning riverine ecosystems. We use a GIS-based distance, cost-weighted spatial model to measure the possible pathways and travel durations for fish migrating from a mainstem river channel to ten different floodplain lakes during a range of discharge magnitudes. We modeled routes of movement and fish swim times for five discharges that ranged from 140 to 1585 m3 s−1 and represented a gradient of hydrologic connectivity. Hydrologic travel pathways included perennial floodplain channels (tributaries and permanent lakes) and intermittently active floodplain channels (channels re-occupying abandoned meander segments, meander-scrolls, batture channels, and crevasses). The different hydrologic pathways made available during the different discharge magnitudes were represented using spatially-variable, raster-based cost surfaces. Fish swim times and route of movement varied with discharge magnitude and lake location. Two distinct patterns emerged between the fish swim times and routes of movement. One group of five floodplain lakes experienced very little change in the route or rate of fish movement with increasing discharge, while another group of five lakes exhibited significant decreases in swim time with increasing discharge. These responses indicate the importance of managing for flood pulses of various magnitudes that hydrologically connect the river and floodplain through different pathways, enabling dynamic spatial and temporal exchanges of organisms and materials.
      PubDate: 2017-11-21
      DOI: 10.1007/s00027-017-0555-y
      Issue No: Vol. 80, No. 1 (2017)
       
  • Longitudinal thermal heterogeneity in rivers and refugia for coldwater
           species: effects of scale and climate change
    • Authors: A. H. Fullerton; C. E. Torgersen; J. J. Lawler; E. A. Steel; J. L. Ebersole; S. Y. Lee
      Abstract: Abstract Climate-change driven increases in water temperature pose challenges for aquatic organisms. Predictions of impacts typically do not account for fine-grained spatiotemporal thermal patterns in rivers. Patches of cooler water could serve as refuges for anadromous species like salmon that migrate during summer. We used high-resolution remotely sensed water temperature data to characterize summer thermal heterogeneity patterns for 11,308 km of second–seventh-order rivers throughout the Pacific Northwest and northern California (USA). We evaluated (1) water temperature patterns at different spatial resolutions, (2) the frequency, size, and spacing of cool thermal patches suitable for Pacific salmon (i.e., contiguous stretches ≥ 0.25 km, ≤ 15 °C and ≥ 2 °C, aooler than adjacent water), and (3) potential influences of climate change on availability of cool patches. Thermal heterogeneity was nonlinearly related to the spatial resolution of water temperature data, and heterogeneity at fine resolution (< 1 km) would have been difficult to quantify without spatially continuous data. Cool patches were generally > 2.7 and < 13.0 km long, and spacing among patches was generally > 5.7 and < 49.4 km. Thermal heterogeneity varied among rivers, some of which had long uninterrupted stretches of warm water ≥ 20 °C, and others had many smaller cool patches. Our models predicted little change in future thermal heterogeneity among rivers, but within-river patterns sometimes changed markedly compared to contemporary patterns. These results can inform long-term monitoring programs as well as near-term climate-adaptation strategies.
      PubDate: 2017-11-21
      DOI: 10.1007/s00027-017-0557-9
      Issue No: Vol. 80, No. 1 (2017)
       
  • From isolation to connectivity: the effect of floodplain lake restoration
           on sediments as habitats for macroinvertebrate communities
    • Authors: Krystian Obolewski; Katarzyna Glińska-Lewczuk; Martyna Bąkowska
      Abstract: Abstract The present study aimed to identify potential macrozoobenthic habitat indicators of the ecological success of restoration projects. As a part of the complex restoration project in the Słupia River floodplain (N Poland), the connectivity between three oxbow lakes and the river channel was re-established to improve biodiversity of the floodplain area, including bottom fauna. Following restoration, changes in the dynamics of flowing water and water levels induced the transformation of oxbows from plesiopotamal (lentic) to eupotamal (lotic) and subsequently to parapotamal (semi-lotic) habitats. The restored sites underwent a rapid depletion of benthic coarse particulate organic matter, with direct changes in most of the investigated parameters of bottom sediments, including conductivity, total organic carbon, soluble reactive phosphorus and total nitrogen. Redundancy analysis revealed that the changes in benthic fauna structure resulted from the increased connectivity with the river (flow rate) and changes in the chemical properties of sediments. The restored oxbow lakes were colonized by six new macroinvertebrate species whose density increased substantially. The assessment of the overall river-floodplain system restoration project indicated positive implications for improving the qualitative and quantitative structure of benthic fauna. However, to confirm ecologically successful restoration, it is necessary to evaluate appropriate sets of indicators based on a complex food web structure and more efficient or enhanced ecosystem functions. This study contributes to the discussion of sustainable management of floodplains to provide benefits to macroinvertebrates as indicators of aquatic ecosystem health under different restoration activities.
      PubDate: 2017-11-21
      DOI: 10.1007/s00027-017-0556-x
      Issue No: Vol. 80, No. 1 (2017)
       
  • Patterns and controls of mercury accumulation in sediments from three
           thermokarst lakes on the Arctic Coastal Plain of Alaska
    • Authors: S. M. Burke; C. E. Zimmerman; B. A. Branfireun; J. C. Koch; H. K. Swanson
      Abstract: Abstract The biogeochemical cycle of mercury will be influenced by climate change, particularly at higher latitudes. Investigations of historical mercury accumulation in lake sediments inform future predictions as to how climate change might affect mercury biogeochemistry; however, in regions with a paucity of data, such as the thermokarst-rich Arctic Coastal Plain of Alaska (ACP), the trajectory of mercury accumulation in lake sediments is particularly uncertain. Sediment cores from three thermokarst lakes on the ACP were analyzed to understand changes in, and drivers of, Hg accumulation over the past ~ 100 years. Mercury accumulation in two of the three lakes was variable and high over the past century (91.96 and 78.6 µg/m2/year), and largely controlled by sedimentation rate. Mercury accumulation in the third lake was lower (14.2 µg/m2/year), more temporally uniform, and was more strongly related to sediment Hg concentration than sedimentation rate. Sediment mercury concentrations were quantitatively related to measures of sediment composition and VRS-inferred chlorophyll a, and sedimentation rates were related to various catchment characteristics. These results were compared to data from 37 previously studied Arctic and Alaskan lakes. Results from the meta-analysis indicate that thermokarst lakes have significantly higher and more variable Hg accumulation rates than non-thermokarst lakes, suggesting that certain properties (e.g., thermal erosion, thaw slumping, low hydraulic conductivity) likely make lakes prone to high and variable Hg accumulation rates. Differences and high variability in Hg accumulation among high latitude lakes highlight the complexity of predicting future climate-related change impacts on mercury cycling in these environments.
      PubDate: 2017-11-20
      DOI: 10.1007/s00027-017-0553-0
      Issue No: Vol. 80, No. 1 (2017)
       
  • Experimental drought changes ecosystem structure and function in a
           macrophyte-rich stream
    • Authors: T. Riis; P. S. Levi; A. Baattrup-Pedersen; K. G. Jeppesen; S. Rosenhøj Leth
      Pages: 841 - 853
      Abstract: Water abstraction continues to increase worldwide, causing periods with extreme low-flow in many streams, which will likely intensify in the future due to climate change. Extreme low-flow may have major effects on in-stream habitats, organisms, and consequently ecosystem functions. We investigated the effects of a 2 months experimentally induced extreme low-flow scenario on the physical, biological, and functional characteristics in a macrophyte-rich lowland stream using a before-after, control-impact (BACI) approach. We quantified nutrient dynamics, including inorganic nitrogen and phosphorus concentrations, ammonium uptake, and whole-stream metabolism. We found a significant decline in the stream wetted habitat area, an increase in water temperature, and an increase in the accumulation of fine organic matter with reduced flow, but no significant changes in dissolved oxygen or benthic chlorophyll a concentrations. Furthermore, the relative demand and overall uptake of ammonium was lower in the low-flow reach relative to the control reach, whereas the relative demand and uptake of phosphate were higher at low-flow. Our results demonstrate that low-flow conditions cause resource limitation in stream biota most likely due to increased thickness of the diffusive boundary layers and an enhanced heterotrophic activity in the accumulated fine organic matter. Our results imply that the basal resources for productivity shift from autotrophic towards more heterotrophic resources causing a shift at higher trophic levels towards more detritivore based and less herbivore based food webs with implications for the invertebrate community composition and the distribution of functional feeding groups. Based on the strong links observed between low-flow and nutrient uptake, we suggest that functional metrics are suitable to assess the effects of low-flow conditions in small streams.
      PubDate: 2017-10-01
      DOI: 10.1007/s00027-017-0536-1
      Issue No: Vol. 79, No. 4 (2017)
       
  • Does the loss of climate sensitive detritivore species alter leaf
           decomposition'
    • Authors: Bonny Wenisch; Diego G. Fernández; Eduard Szöcs; Brendan G. Mckie; Ralf B. Schäfer
      Pages: 869 - 879
      Abstract: Abstract Climate change is predicted to increase average temperatures and the frequency of extreme weather events, and thus might alter the composition of freshwater communities through effects on climate-sensitive taxa, with uncertain outcomes for the ecosystem processes they regulate. Here we investigated how loses of more environmentally sensitive detritivores alter the key ecosystem process of leaf litter decomposition in a field experiment in two pristine streams with different local shredder assemblages in the Palatinate forest, south-western Germany. We compared bulk leaf decomposition rate and the leaf processing efficiency of shredders in enclosures containing three shredder diversity treatments, where species loss was simulated based on their climate sensitivity. Litter decomposition rates contrasted markedly between survey sites, with a 33% increase and 41% decrease in decomposition following species loss at the first and second site, respectively. Results for the first site suggest that the least sensitive taxa, which were also larger in biomass, contributed most to leaf mass loss, and these were able to compensate for losses of sensitive species, ultimately increasing bulk leaf processing. By contrast, at the second site sensitive species played a more important role in litter decomposition and their loss was not compensated when accounting for detritivore biomass. Our findings demonstrate the importance of the species trait composition of local species pools in regulating the potential effects of changes in assemblage composition caused by climate change.
      PubDate: 2017-10-01
      DOI: 10.1007/s00027-017-0538-z
      Issue No: Vol. 79, No. 4 (2017)
       
  • Molecular composition and bioavailability of dissolved organic nitrogen in
           a lake flow-influenced river in south Florida, USA
    • Authors: Oliva Pisani; Joseph N. Boyer; David C. Podgorski; Cassondra R. Thomas; Teresa Coley; Rudolf Jaffé
      Pages: 891 - 908
      Abstract: Abstract Dissolved organic nitrogen (DON) represents a large percentage of the total nitrogen in rivers and estuaries, and can contribute to coastal eutrophication and hypoxia. This study reports on the composition and bioavailability of DON along the Caloosahatchee River (Florida), a heavily managed system receiving inputs from Lake Okeechobee as well as agricultural and urban runoff from the surrounding watershed. Water samples were collected bimonthly for 1 year beginning December 2014 at three stations along the river. Treatments included 28-day dark incubations with and without prior photo-irradiation. Concentrations of DON, ammonium, nitrate–nitrite, total hydrolyzable amino acids (THAA), and urea, as well as bacterial numbers, leucine aminopeptidase activity, and fluorescent optical properties were measured. Ultra-high resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) was used to characterize the molecular composition of DON before and after incubation for selective samples. The total dissolved N pool was dominated by DON (61–99%), with low inorganic N (1–39%), and small amounts of THAA-N (0.1–23%) and urea-N (0.6–3.2%). The mean percentage of biologically available DON (BDON) for the study was 15% (−12–61% range) with highest values occurring when water inputs from Lake Okeechobee were the most dominant freshwater source. FT-ICR MS analysis revealed the presence of a wide range of N-containing formulas and the generation of aliphatic and ‘peptide-like’ structures likely due to microbial alteration of the carbon skeleton of DON compounds. Effects of light exposure prior to incubation did not have a measurable effect on %BDON but did affect bacterial biomass and DON composition. These findings may help predict nutrient loading effects to the Caloosahatchee River estuary and may aid in understanding wetland potential as a treatment technology for removing N in this and other freshwater systems sensitive to N loading.
      PubDate: 2017-10-01
      DOI: 10.1007/s00027-017-0540-5
      Issue No: Vol. 79, No. 4 (2017)
       
  • Influence of land use and lithology on sources and ages of nutritional
           resources for stream macroinvertebrates: a multi-isotopic approach
    • Authors: Amber R. Bellamy; James E. Bauer; Andrea G. Grottoli
      Pages: 925 - 939
      Abstract: Abstract Terrestrially-derived carbon (C) and organic matter (OM)—often of significant age—dominate in many streams and rivers, yet little is known about their potential nutritional contributions to aquatic macroinvertebrate consumers. Impacts of watershed characteristics (e.g., land use and lithology) on the sources and ages of C and OM utilized by aquatic consumers are also poorly understood. To assess these factors, macroinvertebrates were collected from six headwater streams having different watershed lithologies and land uses in the Hudson-Mohawk River system (New York, USA) and analyzed for natural δ13C, δ15N, δ2H, and ∆14C. A Bayesian stable isotopic mixing model revealed that autochthonous primary production dominated (62–92%) the biomass of all functional feeding groups (FFGs) across all sites, with allochthonous sources being of secondary but still significant (21–31%) importance. Macroinvertebrates collected from streams in watersheds having low vs. high agricultural land use were estimated to assimilate 0–13 and 4–31% soil-derived C and OM, respectively. ∆14C values and apparent ages of macroinvertebrates from shale-rich and shale-poor sites were also significantly different (mean ∆14C = −75 and −34‰; equivalent 14C ages = 630 and 280 years B.P., respectively). Inclusion of ∆14C data in mixing models confirmed the importance of autochthonous primary production, and also demonstrated indirect lithological control of nutritional resource utilization by influencing stream substrate type and potential retention of allochthonous C and OM. Findings from this study further showed that the relative magnitudes of autochthonous vs. allochthonous contributions to macroinvertebrates were dependent on FFG, land use type, and lithology.
      PubDate: 2017-10-01
      DOI: 10.1007/s00027-017-0542-3
      Issue No: Vol. 79, No. 4 (2017)
       
  • Moderate nutrient enrichment affects algal and detritus pathways
           differently in a temperate rainforest stream
    • Authors: Liliana García; Isabel Pardo; Wyatt F. Cross; John S. Richardson
      Pages: 941 - 952
      Abstract: Abstract We manipulated nutrient concentrations in 14 channels adjacent to a forested headwater stream to examine the influence of nutrient enrichment on detrital and algal pathways. Our fertilization experiment increased the average water concentration of N up to a maximum of ~2 times and of P up to ~7 times relative to control channels, levels considered as moderate enrichment. We measured algal biomass and leaf mass loss as a proxy measure of primary production and leaf decomposition, respectively. We determined the effects of nutrients on the quantity and quality of food resources and tested whether these effects influenced biotic structure and stoichiometry. Our results indicate that algal pathways showed significant and consistent responses across treatments by increasing epilithon quantity and quality. Moreover, despite an increase in quality of leaves, its quantity and loss rate were unaltered. Importantly, changes to detritivore densities were subtle, but they showed a hump-shaped response along the induced nutrient gradient. This trend suggests the existence of nutrient limitation at low nutrient concentrations and the existence of negative biotic interactions and/or sublethal toxic effects at higher concentrations, while enhancing detritivore densities at intermediated enriched conditions (threshold at ~10 µg/l of P–PO4 in water and 0.10% of leaf-P). This study reveals the complexity of connections between algal and detritus pathways with implications in the study of transfer of matter and energy in oligotrophic, forested headwater streams.
      PubDate: 2017-10-01
      DOI: 10.1007/s00027-017-0543-2
      Issue No: Vol. 79, No. 4 (2017)
       
  • Community responses to dam removal in a subtropical mountainous stream
    • Authors: Hao-Yen Chang; Ming-Chih Chiu; Yi-Li Chuang; Chyng-Shyan Tzeng; Mei-Hwa Kuo; Chao-Hsien Yeh; Hsiao-Wen Wang; Sheng-Hai Wu; Wen-Hui Kuan; Shang-Te Tsai; Kwang-Tsao Shao; Hsing-Juh Lin
      Pages: 967 - 983
      Abstract: Abstract Dam removal has the potential to efficiently solve the problems caused by fragmented stream habitats but may simultaneously cause negative impacts on biotic communities. To conserve the critically endangered Formosan landlocked salmon (Oncorhynchus masou formosanus), a 15-m-tall check dam was partially removed from the Chichiawan Stream at the end of May 2011, before the flood season. Using this dam removal experience, we aimed to cast dam removal as an action comparable to a natural flood event. We applied a before-after-control-impact (BACI) design and quantified the environmental factors and major biotic communities at four sampling sites in the stream bimonthly before (2010) and after (2012 and 2013) the dam removal and monthly in the year of the dam removal (2011). After the dam removal, a faster current velocity and more turbid water were observed at the downstream sites, and the area’s deposition consisted of small-grained sediments. Despite this, our results show that the dam removal was performed during a suitable period. There was no obvious influence on tadpoles as they metamorphosed into adult frogs and left the stream before the dam removal. Fish exhibited a greater resistance to the alteration in flow resulting from the dam removal. An increase in fish abundance at the upstream sites after the dam removal suggests that the corridors created by the dam removal allowed access to more habitats for the fish. In particular, the periphyton biomass and aquatic insect densities decreased markedly at the downstream sites after the dam removal, but they recovered within a year, demonstrating the resilience of these taxa. Coleoptera, Plecoptera and Trichoptera were more resistant than the periphyton, Diptera and Ephemeroptera after the dam removal and an extreme flood event. In conclusion, the responses of stream communities to dam removal were similar to the responses to an extreme flood event. To mitigate the impacts caused by dam removal, our results suggest that stream communities may respond to dam removal as a natural flow alteration if the timing of the dam removal occurs just before the flood season.
      PubDate: 2017-10-01
      DOI: 10.1007/s00027-017-0545-0
      Issue No: Vol. 79, No. 4 (2017)
       
  • Response of aquatic insects along gradients of agricultural development
           and flood magnitude in northern Japanese streams
    • Authors: Masanao Sueyoshi; Koji Tojo; Nobuo Ishiyama; Futoshi Nakamura
      Pages: 985 - 994
      Abstract: Abstract Agricultural activities have increased environmental homogenisation in stream ecosystems. These alterations reduce the availability of flow refugia during flooding and increase the effects of flood disturbances on aquatic insects. Thus, we examined the effects of the agricultural development (percentage of pasture cover within the catchment) and flood magnitude (ratio of shear stress at high flow to that at low flow) on the resistance indices measured by relative changes in taxon richness or abundance between pre- and post-flood (all insects, five orders and 31 dominant taxa) at 27 sites in the Kitamihorobetsu River, northern Japan. The resistance index of taxon richness decreased with increasing agricultural development, whereas that of the abundance of all insects decreased synergistically with increasing agricultural development and flood magnitude. Among 31 dominant taxa, the resistance indices of 20 taxa, generally belonging to Ephemeroptera, Plecoptera and Trichoptera, exhibited stronger negative relationships with agricultural development than with flood magnitude. By contrast, three Diptera taxa exhibited week negative relationships with agricultural development. These results showed that the interactive effect between agricultural development and flood magnitude was taxon dependent, but agricultural development could be detrimental to the resistance of most of the studied taxa, especially Ephemeroptera, Plecoptera and Trichoptera taxa. Additionally, agricultural developments in our study watersheds was relatively low (<18% pasture cover), and nevertheless, apparent interacting effects with natural disturbance was detected. This implies that limited agricultural development along the river line can lower the resistance of instream insects to natural disturbances.
      PubDate: 2017-10-01
      DOI: 10.1007/s00027-017-0547-y
      Issue No: Vol. 79, No. 4 (2017)
       
  • Erratum to: Using a gradient in food quality to infer drivers of fatty
           acid content in two filter-feeding aquatic consumers
    • Authors: James H. Larson; William B. Richardson; Jon M. Vallazza; Lynn A. Bartsch; Michelle R. Bartsch
      PubDate: 2017-07-06
      DOI: 10.1007/s00027-017-0548-x
       
 
 
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