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Publisher: Springer-Verlag   (Total: 2329 journals)

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Showing 1 - 200 of 2329 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: 9, SJR: 1.073, h-index: 25)
AAPS J.     Hybrid Journal   (Followers: 18, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 5, 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: 2, SJR: 0.447, h-index: 12)
Academic Psychiatry     Full-text available via subscription   (Followers: 22, SJR: 0.492, h-index: 32)
Academic Questions     Hybrid Journal   (Followers: 7, 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: 10, 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: 14, 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: 3)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 1, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 6, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 10, 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: 5, 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: 18, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 4, 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   (SJR: 0.348, h-index: 27)
Acta Neuropathologica     Hybrid Journal   (Followers: 3, 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)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5, SJR: 0.103, h-index: 4)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 20, SJR: 0.871, h-index: 15)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 14, 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: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 53, 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: 23, 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: 40, 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: 1, SJR: 0.511, h-index: 36)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 8, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 14, 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: 12, SJR: 1.197, h-index: 49)
Agroforestry Systems     Hybrid Journal   (Followers: 20, 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: 7, 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: 3, SJR: 0.706, h-index: 19)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 2, 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: 7, 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: 4, 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: 14, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 10, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 24, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 7, SJR: 0.634, h-index: 13)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 11, 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: 21, SJR: 0.293, h-index: 13)
American Sociologist     Hybrid Journal   (Followers: 11, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 7, SJR: 1.362, h-index: 83)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 5, SJR: 0.21, h-index: 37)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 4, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal  
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 4)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 28, 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: 15, 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: 8)
Annals of Dyslexia     Hybrid Journal   (Followers: 9, 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: 4, 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: 13, SJR: 1.117, h-index: 62)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6, SJR: 0.593, h-index: 42)
Annals of Microbiology     Hybrid Journal   (Followers: 9, 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: 8, SJR: 1.186, h-index: 78)
Annals of Regional Science     Hybrid Journal   (Followers: 7, SJR: 0.405, h-index: 42)
Annals of Software Engineering     Hybrid Journal   (Followers: 12)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 10, SJR: 0.553, h-index: 8)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 11, 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: 44, SJR: 0.575, h-index: 80)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 17, SJR: 0.267, h-index: 26)
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 46, SJR: 0.705, h-index: 35)
Applied Entomology and Zoology     Partially Free   (Followers: 2, SJR: 0.554, h-index: 34)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.323, h-index: 9)
Applied Geophysics     Hybrid Journal   (Followers: 7, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 14, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3, 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: 4, 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: 7, SJR: 0.677, h-index: 47)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 10, SJR: 0.288, h-index: 15)
Applied Solar Energy     Hybrid Journal   (Followers: 15, SJR: 0.251, h-index: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4, 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: 30, SJR: 0.646, h-index: 44)
Aquatic Geochemistry     Hybrid Journal   (Followers: 3, SJR: 0.764, h-index: 39)
Aquatic Sciences     Hybrid Journal   (Followers: 12, 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: 21, 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: 52, SJR: 0.804, h-index: 22)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, 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: 4, SJR: 0.865, h-index: 40)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4, SJR: 2.841, h-index: 40)
Archives of Dermatological Research     Hybrid Journal   (Followers: 6, SJR: 0.9, h-index: 65)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 10, SJR: 0.846, h-index: 84)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 16, 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: 9, SJR: 1.198, h-index: 74)
Archives of Toxicology     Hybrid Journal   (Followers: 16, 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: 13, 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: 1, SJR: 0.797, h-index: 17)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.145, h-index: 8)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 10, SJR: 0.288, h-index: 25)
Artificial Intelligence Review     Hybrid Journal   (Followers: 15, 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: 4, SJR: 0.247, h-index: 9)
Asia Pacific Education Review     Hybrid Journal   (Followers: 9, SJR: 0.371, h-index: 17)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 11, SJR: 1.676, h-index: 50)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 11, 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: 7, 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  
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 21, SJR: 4.511, h-index: 44)
Astronomy Letters     Hybrid Journal   (Followers: 19, SJR: 0.58, h-index: 30)
Astronomy Reports     Hybrid Journal   (Followers: 12, SJR: 0.473, h-index: 23)
Astrophysical Bulletin     Hybrid Journal   (Followers: 2, SJR: 0.469, h-index: 11)

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Journal Cover Aquatic Sciences
  [SJR: 1.172]   [H-I: 53]   [12 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  [2329 journals]
  • CDOM and the underwater light climate in two shallow North Patagonian
           lakes: evaluating the effects on nano and microphytoplankton community
    • Authors: Marina Gerea; Gonzalo L. Pérez; Fernando Unrein; Carolina Soto Cárdenas; Donald Morris; Claudia Queimaliños
      Pages: 231 - 248
      Abstract: Abstract We performed an annual synchronous sampling in two oligotrophic shallow lakes to assess the influence of chromophoric dissolved organic matter (CDOM) on the underwater light climate, and its potential effects on the nano and microphytoplankton community structure. Lake Escondido showed higher CDOM concentration and light attenuation with a spectral composition of underwater light shifted towards green–yellow light, while Lake Morenito presented clearer waters and a dominance of green light. Temporal dynamics of CDOM absorption at 440 nm were consistently explained by differences in cumulative precipitation. Mixotrophic cryptophytes and chrysophytes dominated the phytoplankton of both lakes, although the prevalence of each algal group was different between lakes. The dominance of these groups was largely explained by differences in spectral composition of underwater light, estimated as the ratio between Kd(RED) and Kd(GREEN) [Kd(R)/Kd(G) ratio]. Cryptophytes prevailed in Lake Morenito and their biomass showed a positive strong relationship with Kd(R)/Kd(G) ratio. Chrysophyte biomass was comparatively more important in Lake Escondido showing an opposite relationship with the Kd(R)/Kd(G) ratio. These results underscore that higher relative green light availability allowed the dominance of cryptophytes, while changes in light spectral composition driven by CDOM allowed coexistence. We suggest that nano and microphytoplankton community structure in these lakes could be driven by changes in spectral composition of underwater light shaped by differences in CDOM, ultimately determined by precipitation/hydrological patterns.
      PubDate: 2017-04-01
      DOI: 10.1007/s00027-016-0493-0
      Issue No: Vol. 79, No. 2 (2017)
  • Consequences of altered temperature regimes for emerging freshwater
    • Authors: Paula Sardiña; John Beardall; Jason Beringer; Mike Grace; Ross M. Thompson
      Pages: 265 - 276
      Abstract: Abstract We used highly realistic temperature treatments based on down-scaled global circulation models for 1990–2000 (control) and 2100 (warming treatment) to experimentally assess the impacts of altered temperature regimes on the emerging adults of aquatic insect communities. Experiments were run for 6 weeks and emerging adults of insects were identified and measured for length. There were clear responses to the warming treatment, but responses were taxa- and gender-specific. Males of mayfly Ulmerophlebia pipinna Suter 1986 (Leptophlebiidae) emerged faster under 2100 temperatures. This resulted in a change in the sex ratio that could compromise populations. Mean body size of some insects decreased under warming conditions, which is in agreement with the general hypothesis of reduced body size in response to climate change. However, the degree to which organism size was affected by temperature varied within and between taxa. These changes show the potential for changed temperature regimes to impact ecological systems at individual, population, and community levels. Changes in body size and species composition of emerging insects are likely to impact different levels in both the aquatic and terrestrial communities, for example through disruption of interactions between emerging insects and riparian predators which rely on those resources.
      PubDate: 2017-04-01
      DOI: 10.1007/s00027-016-0495-y
      Issue No: Vol. 79, No. 2 (2017)
  • Intra- and inter-annual variability in metabolism in an oligotrophic lake
    • Authors: David C. Richardson; Cayelan C. Carey; Denise A. Bruesewitz; Kathleen C. Weathers
      Pages: 319 - 333
      Abstract: Abstract Lakes are sentinels of change in the landscapes in which they are located. Changes in lake function are reflected in whole-system metabolism, which integrates ecosystem processes across spatial and temporal scales. Recent improvements in high-frequency open-water metabolism modeling techniques have enabled estimation of rates of gross primary production (GPP), respiration (R), and net ecosystem production (NEP) at high temporal resolution. However, few studies have examined metabolic rates over daily to multi-year temporal scales, especially in oligotrophic ecosystems. Here, we modified a metabolism modeling technique to reveal substantial intra- and inter-annual variability in metabolic rates in Lake Sunapee, a temperate, oligotrophic lake in New Hampshire, USA. Annual GPP and R increased each summer, paralleling increases in littoral, but not pelagic, total phosphorus concentrations. Storms temporarily decoupled GPP and R, resulting in greater decreases in GPP than R. Daily rates of GPP and R were positively correlated on warm days that had stable water columns, and metabolism model fits were best on warm, sunny days, indicating the importance of lake physics when evaluating metabolic rates. These metabolism data span a range of temporal scales and together suggest that Lake Sunapee may be moving toward mesotrophy. We suggest that functional, integrative metrics, such as metabolic rates, are useful indicators and sentinels of ecosystem change. We also highlight the challenges and opportunities of using high-frequency measurements to elucidate the drivers and consequences of intra- and inter-annual variability in metabolic rates, especially in oligotrophic lakes.
      PubDate: 2017-04-01
      DOI: 10.1007/s00027-016-0499-7
      Issue No: Vol. 79, No. 2 (2017)
  • In situ accumulation of tetrodotoxin in non-toxic Pleurobranchaea maculata
    • Authors: Lauren Salvitti; Susanna A. Wood; Rex Fairweather; David Culliford; Paul McNabb; S. Craig Cary
      Pages: 335 - 344
      Abstract: Abstract Tetrodotoxin (TTX) is a highly potent neurotoxin targeting voltage gated sodium channels. It is found in numerous phyla, including both marine and terrestrial taxa, however, its origin is a topic of considerable debate. The aim of this study was to investigate the origin of TTX in the Opisthobranch Pleurobranchaea maculata using in situ experimentation. Sixteen individuals sourced from non-toxic populations were transplanted to a habitat with toxic populations. These were kept in mesh net cages either; (1) anchored to the seafloor, or (2) deployed 0.5 m off the benthos. They were fed a non-toxic diet for 8 weeks before being sacrificed, and either the entire organisms or specific organs analysed for TTX via liquid chromatography–mass spectrometry. Four of the six remaining individuals from cages on the benthos contained TTX (max. 0.79 mg kg−1), whilst only two of eight from the suspended cages contained TTX and concentrations were lower (max. 0.43 mg kg−1). These were similar to the lowest concentrations (min. 0.4 mg kg−1) detected in free-living specimens collected during the experimental period. Among positive individuals the highest concentrations were detected in gonad tissues. These data, in concert with previous studies, suggest an environmental source of TTX for P. maculata, which may be bacterial or dietary in origin. High-Throughput Sequencing (18S ribosomal RNA gene metabarcoding) of foregut contents from toxic and non-toxic individuals was used to investigate their diet. High abundances of Cnidaria and Annelida sequences were identified and these groups should be targeted in future efforts to identify TTX-containing organisms.
      PubDate: 2017-04-01
      DOI: 10.1007/s00027-016-0500-5
      Issue No: Vol. 79, No. 2 (2017)
  • What drives riparian plant taxa and assemblages in Mediterranean
    • Authors: Claudia Angiolini; Alessia Nucci; Marco Landi; Gianluigi Bacchetta
      Pages: 371 - 384
      Abstract: Abstract This study focused on floodplains of four rivers flowing into the Tyrrhenian Sea. Our main questions are: what environmental classifications account for variations in riparian plant assemblages along Mediterranean river floodplains' How is classification predictive power affected by taxonomic resolution' What are the environmental features that may be influencing plant taxa composition' We collected riparian vascular plant and environmental GIS data (morphology and land-use) from 189 river segments. Hierarchical clustering was used to derive environmental and biological groups of segments. We applied a measure of classification strength (CS) to account for variations in riparian plant assemblages, considering CS with respect to species and higher taxonomic levels. We used non-metric multidimensional scaling (NMS) ordination to identify major environmental features influencing plant assemblages. Our results showed the correspondence’s strength between classifications and plant taxa was significant, albeit low, for all data. The hybrid classification, based on morphology plus land use, gave the best CS values for all taxonomic levels and emerged as the best determinant for discriminating differences in riparian plant composition. The correspondence between the classification criteria and plant assemblages depended on the taxonomic level analysed and genus level has best CS results. NMS for taxonomic groups showed that only a few environmental features could be identified as major factors influencing plant composition in floodplains, among which cover of mixed woodlands was the best. A local-scale approach and incorporation of more detailed variables into the classification scheme may therefore improve the match between environmental classification and plant community composition.
      PubDate: 2017-04-01
      DOI: 10.1007/s00027-016-0503-2
      Issue No: Vol. 79, No. 2 (2017)
  • Aquatic habitat response to climate-driven hydrologic regimes and water
           operations in a montane reservoir in the Pacific Northwest, USA
    • Authors: D. E. Weigel; L. C. Vilhena; P. Woods; D. Tonina; A. Tranmer; R. Benjankar; C. L. Marti; P. Goodwin
      Abstract: Freshwater systems are progressively becoming more stressed with increased human demands combined with expected trends in climate, which can threaten native biota and potentially destabilize the ecosystem. Numerical models allow water managers to evaluate the combined effects of climate and water management on the biogeochemical processes thereby identifying opportunities to optimize water management to protect ecosystem function, biodiversity and associated services. We used a 3D hydrodynamic model (ELCOM) coupled with an aquatic ecosystem dynamic model (CAEDYM) to compare two scenarios across three climatic and hydrologic conditions (extreme wet, extreme dry and average) for Deadwood Reservoir (USA). Additionally, we collected water temperature, water chemistry and biological data from the reservoir and inflowing tributaries to validate the model, as well as migration and growth data from Bull Trout (Salvelinus confluentus) the top predator of the food web. Modeled scenarios identified that reducing minimum outflows from 1.4 to 0.06 m3 s−1 during the fall and winter months resulted in higher reservoir elevations and cooler water temperatures the following year, which extended reservoir rearing during the summer and fall seasons. The scenarios with reduced stream flow during the fall and winter seasons indicate benefits to the reservoir ecosystem, particularly during dry years, and could reduce the effects of climatic warming.
      PubDate: 2017-05-23
      DOI: 10.1007/s00027-017-0544-1
  • Does the loss of climate sensitive detritivore species alter leaf
    • Authors: Bonny Wenisch; Diego G. Fernández; Eduard Szöcs; Brendan G. Mckie; Ralf B. Schäfer
      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: 2017-05-17
      DOI: 10.1007/s00027-017-0538-z
  • Functional associations between microalgae, macrophytes and invertebrates
           distinguish river types
    • Authors: Maria João Feio; Salomé F. P. Almeida; Francisca C. Aguiar
      Abstract: Abstract Contemporary large-scale river ecology is grounded on the existence of patterns in the distribution of aquatic communities, structured by prevailing abiotic conditions. Here, we investigated the existence of functional consistent associations of traits (i.e., traits appearing consistently together at different sites and the same river type) between different biological elements of the aquatic community, assuming that species traits confer them advantages for certain environmental conditions but also within the aquatic community. If this is true, these trait associations should be consistently found in water bodies with similar characteristics (river types), defining different types of ecosystem functioning. To test this, 79 least-disturbed sites, belonging to five well-defined Portuguese river types and covering the longitudinal river gradient were used: headwaters of semi-arid streams, mountainous streams and northern-Atlantic climate streams, middle reaches and lowland large rivers. For each river type, we analyzed the strongest associations (via the Bray–Curtis coefficient) between diatoms, benthic invertebrates and macrophytes and traits that could be relevant to their interactions (e.g., invertebrate trophic groups, mobility/fixation ability of diatoms, macrophyte affinity to water) against a priori predictions. The strongest associations of traits changed over the river continuum with an increase in their complexity (number of associations) from headwaters to middle reaches and a decrease in lowland large rivers. These changes were not related to total richness, which was similar for all river types and over the continuum (ca. 100 taxa). In the three types of headwaters, there were also clear differences in associations among aquatic elements. The importance of riparian trees in small streams was not as high as expected while instream macrophytes were more relevant than predicted. This study revealed the existence of predictable functional associations that could serve as a basis for the functional assessment of running waters.
      PubDate: 2017-05-16
      DOI: 10.1007/s00027-017-0541-4
  • 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
      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: 2017-05-13
      DOI: 10.1007/s00027-017-0540-5
  • 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
      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: 2017-05-13
      DOI: 10.1007/s00027-017-0536-1
  • 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
      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: 2017-05-13
      DOI: 10.1007/s00027-017-0543-2
  • Biomass loss and nutrient release from decomposing aquatic macrophytes:
           effects of detrital mixing
    • Authors: Lauren K. Banks; Paul C. Frost
      Abstract: Abstract Aquatic plant decomposition is typically studied on species held separately, whereas diverse plant communities are usually found in lake littoral zones and decomposition occurs as mixtures of multiple species. Here, we examined whether detrital mixing affects the rate of aquatic macrophyte decomposition. Specifically, we measured decomposition rates of detritus from four species (Myriophyllum heterophyllum, Ceratophyllum demersum, Typha × glauca, and Potamogeton robinsii) in single, double, triple, and quadruple species mixtures held over two summer months in a mesotrophic lake in southern Ontario, Canada. We measured detrital mass loss after different time periods for all combinations. There were limited effects of mixing on decomposition rates with inhibitory effects observed in only two of the eleven multi-species mixtures. Decomposition rates of single and mixed species detritus varied with initial C:N and C:P ratios with faster rates seen for more nutrient-rich detritus. Overall, there was no effect of detrital species richness on macrophyte decomposition rates other than smaller differences among the averages of more species-rich mixtures. Our results were inconsistent with interactive effects of mixing on decomposition rates of multiple aquatic plant taxa. Instead, we found decomposition rates of mixed species communities were largely predicted by biomass composition and single-species decomposition estimates. There were also no apparent effects of species mixing on N- or P-specific fluxes or the ratio of these fluxes that resulted during decomposition during our experiment. Our results indicate that future changes in aquatic plant biodiversity may affect rates of decomposition in these ecosystems, but these should be largely predictable based on changes in plant communities and their biomass-weighted stoichiometry.
      PubDate: 2017-05-12
      DOI: 10.1007/s00027-017-0539-y
  • Gravel bar inundation frequency: an important parameter for understanding
           riparian corridor dynamics
    • Authors: W. Gostner; M. Paternolli; A. J. Schleiss; C. Scheidegger; S. Werth
      Abstract: Abstract Riparian zones are some of the most valuable and at the same time endangered ecosystems in the world. Their progressive degradation caused by anthropogenic pressure calls for the adoption of effective, resilient restoration strategies. However, a full understanding of the complex mechanisms governing riparian ecosystems has not yet been achieved, and many assumptions are based on qualitative findings. We quantitatively investigated the habitat conditions of a key riparian plant, the German tamarisk (Myricaria germanica), using a two-dimensional hydrodynamic model that was created for a braided reach of the river Sense (Switzerland). The results demonstrate that the presence of this species in gravel bar habitats is strongly correlated with inundation frequency. The species was present on gravel bars near the main river channels, which are inundated every 4–5 years. Where the gravel bars are frequently flooded, seedlings do not survive the hydrodynamic perturbations, whereas elsewhere, where periodic flooding does not reach, M. germanica is replaced by stronger competitors. Our study contributes to an understanding of the dynamics of riparian corridors and provides a quantitative basis for developing effective restoration plans, which may involve the optimisation of hydropower regulation programmes.
      PubDate: 2017-05-05
      DOI: 10.1007/s00027-017-0535-2
  • The trapping of organic matter within plant patches in the channels of the
           Okavango Delta: a matter of quality
    • Authors: Jonas Schoelynck; Jörg Schaller; Mike Murray-Hudson; Patrick J. Frings; Daniel J. Conley; Dimitri van Pelt; Keotshephile Mosimane; Mangaliso Gondwe; Piotr Wolski; Patrick Meire; Eric Struyf
      Abstract: Abstract The role of in-stream aquatic vegetation as ecosystem engineers in the distribution of organic matter was investigated in the Okavango Delta, one of the world’s largest oligotrophic wetlands. The Okavango channel beds are covered up to 50% with submerged macrophyte patches. By accumulating and concentrating organic matter in the sediments below the patches, macrophytes are likely able to locally forestall a deficiency of nutrients. Up to 21 times more N, 18 times more C, 13 times more P and 6 times more Si can be found in vegetated sediments compared to non-vegetated sediments. Nutrient specific accumulation relates to its relative scarcity in the overlaying water. There is a depletion of dissolved N relative to P, whereas Si is relatively abundant. The Okavango Delta water can generally be characterised as oligotrophic based on plant species composition (e.g. presence of carnivorous plants and absence of floating plants), low plant N:P ratios, and low nutrient- and element-concentrations. Local mineralization and intensified nutrient cycling in the sediments is hypothesized to be crucial for the macrophytes’ survival because it provides a key source of the essential nutrients which plants otherwise cannot obtain in sufficient quantities from the nutrient poor water. By engineering the ecosystem as such, channel vegetation also retards the loss of elements and nutrients to island groundwater flow, contributing to one of the key processes driving the high productivity of the Okavango Delta, making it unique among its kind.
      PubDate: 2017-05-02
      DOI: 10.1007/s00027-017-0527-2
  • Sediment resuspension effects on dissolved organic carbon fluxes and
           microbial metabolic potentials in reservoirs
    • Authors: Tallent Dadi; Katrin Wendt-Potthoff; Matthias Koschorreck
      Abstract: Abstract Sediment resuspension can affect water quality in lakes and reservoirs. We investigated the effect of sediment resuspension on benthic fluxes of dissolved organic carbon (DOC), metals (Fe, Mn), and nutrients (N, P) in three drinking water reservoirs using sediment core incubations. Measurement of Fe and Mn fluxes, and of microbial potentials to degrade organic substrates (Biolog EcoPlates™) were employed to understand mechanisms regulating DOC exchange after sediment resuspension. Single sediment resuspension events resulted in DOC fluxes [−104 (into sediment) to 46 (release) mmol m−2 event−1] equal to 9–17 days of diffusive fluxes, making them a relevant process. Shallow reservoir sites were more likely to immobilize DOC after resuspension than deep sites. Sediment resuspension under anoxia always led to increases of DOC and metals in the overlying water. Resuspension did not necessarily mobilize nitrate or phosphorus even under anoxia, while ammonium was released after resuspension. Sediment resuspension increased hypolimnetic microbial potentials to utilize organic substrates in both spring and summer. However microbial cells counts and biomass either remained constant or decreased in summer. Adsorption to Fe minerals seemed to play a role in DOC immobilization as evidenced by a decrease in DOC:Fe molar ratios after resuspension in Fe limited sites and constant ratios in Fe rich sites. The results demonstrate a potential for DOC immobilization mainly by Fe minerals and to some extent by benthic microbes. Therefore, sediment resuspension can be beneficial for water quality in low nutrient, iron rich systems.
      PubDate: 2017-04-28
      DOI: 10.1007/s00027-017-0533-4
  • Effort-based predictors of headwater stream conditions: comparing the
           proximity of land use pressures and instream stressors on
           macroinvertebrate assemblages
    • Authors: Gregory J. Pond; Kelly J. G. Krock; Jonathan V. Cruz; Leah F. Ettema
      Abstract: Abstract Environmental agencies are often faced with resource and time constraints in assessing waterbody health. We compared the strengths of varying levels of effort (field measures, laboratory chemistry, land use, and multiple combinations of these) to explain macroinvertebrate assemblage response along a gradient of urban land use intensity among 30 headwater streams in northern West Virginia. Because the spatial arrangement of human disturbance can govern biotic response, land use effects were analyzed at five spatial scales (whole catchment, and 100 m buffer zone at three fixed upstream distances and total stream network upstream of site); instream ecological measures included physical habitat, algal concentrations and water chemistry. Of the five spatial scales, we predicted that riparian land use nearest the site would explain the most variation but that instream measures would be the overall driver of the macroinvertebrate assemblages. Regression analysis evaluated the strength of single and multiple variables in explaining macroinvertebrate multimetric index (MMI) and ordination patterns, and revealed that assemblages were highly responsive to numerous stressors. In contrast to predictions, total upstream network riparian forest cover explained the most variation overall (83%) while specific conductance was the single best instream measure (64%). Stepwise regression models using combinations of field, laboratory, and land use variables all performed reasonably well but we found that a 3-variable model [% forest (catchment), road density, and specific conductance] that minimized colinearity and cost/effort explained 90% of the variation in the MMI. Validation and spatial autocorrelation results suggest that this model could potentially be used to forecast stream condition for prioritizing conservation and remediation efforts in headwaters within the ecoregion, and our general approach would be broadly applicable in other settings.
      PubDate: 2017-04-28
      DOI: 10.1007/s00027-017-0534-3
  • Is the chemical composition of biomass the agent by which ocean
           acidification influences on zooplankton ecology'
    • Abstract: Abstract Climate change impacts prevail on marine pelagic systems and food webs, including zooplankton, the key link between primary producers and fish. Several metabolic, physiological, and ecological responses of zooplankton species and communities to global stressors have recently been tested, with an emerging field in assessing effects of combined climate-related factors. Yet, integrative studies are needed to understand how ocean acidification interacts with global warming, mediating zooplankton body chemistry and ecology. Here, we tested the combined effects of global warming and ocean acidification, predicted for the year 2100, on a community of calanoid copepods, a ubiquitously important mesozooplankton compartment. Warming combined with tested pCO2 increase affected metabolism, altered stable isotope composition and fatty acid contents, and reduced zooplankton fitness, leading to lower copepodite abundances and decreased body sizes, and ultimately reduced survival. These interactive effects of temperature and acidification indicate that metabolism-driven chemical responses may be the underlying correlates of ecological effects observed in zooplankton communities, and highlight the importance of testing combined stressors with a regression approach when identifying possible effects on higher trophic levels.
      PubDate: 2017-04-12
      DOI: 10.1007/s00027-017-0532-5
  • Bacterial processes and biogeochemical changes in the water body of kettle
           holes - mainly driven by autochthonous organic matter'
    • Authors: Katrin Attermeyer; Hans-Peter Grossart; Sabine Flury; Katrin Premke
      Abstract: Abstract Kettle holes are small inland waters formed from glacially-created depressions often situated in agricultural landscapes. Due to their high perimeter-to-area ratio facilitating a high aquatic-terrestrial coupling, kettle holes can accumulate high concentrations of organic carbon and nutrients, fueling microbial activities and turnover rates. Thus, they represent hotspots of carbon turnover in the landscape, but their bacterial activities and controlling factors have not been well investigated. Therefore, we aimed to assess the relative importance of various environmental factors on bacterial and biogeochemical processes in the water column of kettle holes and to disentangle their variations. In the water body of ten kettle holes in north-eastern Germany, we measured several physico-chemical and biological parameters such as carbon quantity and quality, as well as bacterial protein production (BP) and community respiration (CR) in spring, early summer and autumn 2014. Particulate organic matter served as an indicator of autochthonous production and represented an important parameter to explain variations in BP and CR. This notion is supported by qualitative absorbance indices of dissolved molecules in water samples and C:N ratios of the sediments, which demonstrate high fractions of autochthonous organic matter (OM) in the studied kettle holes. In contrast, dissolved chemical parameters were less important for bacterial activities although they revealed strong differences throughout the growing season. Pelagic bacterial activities and dynamics might thus be regulated by autochthonous OM in kettle holes implying a control of important biogeochemical processes by internal primary production rather than facilitated exchange with the terrestrial surrounding due to a high perimeter-to-area ratio.
      PubDate: 2017-04-07
      DOI: 10.1007/s00027-017-0528-1
  • Decoupled reciprocal subsidies of biomass and fatty acids in fluxes of
           invertebrates between a temperate river and the adjacent land
    • Authors: Sydney Moyo; Lenin D. Chari; Martin H. Villet; Nicole B. Richoux
      Abstract: Abstract Streams and riparian areas are tightly coupled through reciprocal trophic subsidies, and there is evidence that these subsidies affect consumers in connected ecosystems. Most studies of subsidies consider only their quantity and not their quality. We determined the bidirectional exchange of organisms between the Kowie River and its riparian zone in South Africa using floating pyramidal traps (to measure insect emergence) and pan traps (to capture infalling invertebrates). The exchanges of biomass were variable spatially (three sites) and temporally (four seasons), with emergence declining about two orders of magnitude between summer (169–1402 mg m−2 day−1) and winter (3–28 mg m−2 day−1) across all sites, while invertebrate infall declined by a much smaller range from summer (413–679 mg m−2 day−1) to winter (11–220 mg m−2 day−1). Conversely, the absolute flux of physiologically important highly unsaturated fatty acids contained in the emergent and infalling arthropods peaked at comparable values in summer (emergence = 0.3–18 mg m−2 day−1 and infall = 0.3–3 mg m−2 day−1) and declined less in winter (emergence = 0.01–0.51 mg m−2 day−1 and infall = 0.01–0.03 mg m−2 day−1). During some seasons, there was no net flux of essential fatty acids, but there was generally a net flow of highly unsaturated fatty acids from river to land, even when land-to-river inputs dominated by biomass. Thus, quantitative net fluxes of biomass were decoupled from net fluxes of qualitatively key nutrients, establishing the importance of considering both the quality and the quantity of trophic subsidies.
      PubDate: 2017-04-05
      DOI: 10.1007/s00027-017-0529-0
  • Hydrology drives seasonal variation in dryland stream macroinvertebrate
    • Authors: Xingli Giam; William Chen; Tiffany A. Schriever; Richard Van Driesche; Rachata Muneepeerakul; David A. Lytle; Julian D. Olden
      Abstract: Abstract Many lotic ecosystems are spatially and temporally heterogeneous but none more so than dryland streams flowing through arid and semi-arid landscapes. Understanding seasonal variation in richness and trait composition is critical to our fundamental understanding of these dynamic stream networks. Here, we analyzed aquatic macroinvertebrate communities within perennial and intermittent reaches in replicate dryland watersheds in southwestern USA across 10 seasons and 4 years. We quantified how hydrology, season, and microhabitat type affected taxa richness and trait composition. Taxa richness was higher in perennial than intermittent reaches, in pools than riffles, and in fall and summer than in spring. The interaction between hydrology and season was important; the difference between fall high and spring low richness was greater in intermittent than perennial streams. Hydrology was the main predictor of trait composition; intermittent streams supported a larger fraction of small taxa, taxa with the ability to undergo diapause, and uni- or multivoltine taxa (i.e., taxa with shorter life cycles). Trait composition did not vary across seasons among perennial reaches whereas the fraction of aerial dispersers appeared to be greater in spring than other seasons among intermittent reaches. Our results were largely consistent with predictions of the habitat templet; r-selected traits were more frequently represented in intermittent communities. The temporal characterization of macroinvertebrate community structure in dryland streams provides a powerful glimpse of how stream communities may respond to a drying climate.
      PubDate: 2017-04-03
      DOI: 10.1007/s00027-017-0530-7
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