| Text | 421135 2020 10.1002/lno.11434 Scopus 2 s2.0 85083688068 Lake production fish biomass Energy based top down and bottom up relationships between fish community energy demand or production and phytoplankton across lakes at a continental scale Bartrons M.; Mehner T.; Argillier C.; Beklioglu M.; Blabolil P.; Hesthagen T.; Holmgren K.; Jeppesen E.; Krause T.; Podgornik S.; Volta P.; Winfield I.J.; Brucet S. Aquatic Ecology Group, University of Vic Central University of Catalonia, Vic, Catalonia, Aquatic Ecology Group, University of Vic Central University of Catalonia, Vic, Catalonia, Spain, , Spain; Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany, , Germany; Irstea UR HYAX, Centre d Aix en Provence, Irstea UR HYAX, Centre d Aix en Provence, France, , France; Limnology Laboratory, Department of Biological Sciences, Middle East Technical University, Ankara, Limnology Laboratory, Department of Biological Sciences, Middle East Technical University, Ankara, Turkey, , Turkey; Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara, Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara, Turkey, , Turkey; Biology Centre of the Czech Academy of Sciences, Institute of Hydrobiology, eske Bud jovice, Biology Centre of the Czech Academy of Sciences, Institute of Hydrobiology, eske Bud jovice, Czech Republic, , , Czech Republic; Biology Centre of the Czech Academy of Sciences, Institute of Hydrobiology, eske Bud jovice, Biology Centre of the Czech Academy of Sciences, Institute of Hydrobiology, eske Bud jovice, Czech Republic, , , Czech Republic; Norwegian Institute for Nature Research, Trondheim, Norwegian Institute for Nature Research, Trondheim, Norway, , Norway; Institute of Freshwater Research, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Uppsala, Institute of Freshwater Research, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Uppsala, Sweden, , , Sweden; Institute of Freshwater Research, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Uppsala, Institute of Freshwater Research, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Uppsala, Sweden, , , Sweden; Department of Bioscience, Aarhus University, Silkeborg, Department of Bioscience, Aarhus University, Silkeborg, Denmark, , Denmark; Sino Danish Centre for Education and Research SDC , University of Chinese Academy of Sciences, Beijing, Sino Danish Centre for Education and Research SDC , University of Chinese Academy of Sciences, Beijing, China, , China; Greenland Climate Research Centre GCRC , Greenland Institute of Natural Resources, Nuuk, Greenland Climate Research Centre GCRC , Greenland Institute of Natural Resources, Nuuk, Greenland, , Greenland; Arctic Research Centre, Aarhus University, Aarhus, Arctic Research Centre, Aarhus University, Aarhus, Denmark, , Denmark; Centre for Limnology IEAS, Estonian University of Life Sciences, Tartu, Centre for Limnology IEAS, Estonian University of Life Sciences, Tartu, Estonia, , Estonia; Fisheries Research Institute of Slovenia, Ljubljana, Fisheries Research Institute of Slovenia, Ljubljana, Slovenia, , Slovenia; National Research Council, Water Research Institute, Verbania, National Research Council, Water Research Institute, Verbania, Italy, , Italy; Lake Ecosystems Group, UK Centre for Ecology Hydrology, Lancaster Environment Centre, Lancaster, Lake Ecosystems Group, UK Centre for Ecology Hydrology, Lancaster Environment Centre, Lancaster, UK, , , United Kingdom; Lake Ecosystems Group, UK Centre for Ecology Hydrology, Lancaster Environment Centre, Lancaster, Lake Ecosystems Group, UK Centre for Ecology Hydrology, Lancaster Environment Centre, Lancaster, UK, , , United Kingdom; ICREA, Catalan Institution for Research and Advanced Studies, Barcelona, ICREA, Catalan Institution for Research and Advanced Studies, Barcelona, Spain, , Spain Fish community feeding and production rates may differ between lakes despite similar fish biomass levels because of differences in size structure and local temperature. Therefore, across lake comparisons of the strength and direction of top down and bottom up fish phytoplankton relationships should consider these factors. We used the metabolic theory of ecology to calculate size and temperature corrected community energy demand CED and community production CP of omnivorous fishes in 227 European lakes from major habitat types MHTs of polar freshwaters, temperate floodplain rivers and wetlands, and temperate coastal rivers. We related CED with total phosphorus TP corrected chlorophyll a Chl a concentrations to evaluate a potential top down directed trophic cascade from fish to phytoplankton. Furthermore, we related Chl a with CP to demonstrate potential bottom up effects of phytoplankton on fish. For both analyses, we added the CED of piscivorous fishes CED as a predictor to account for potential predation effects on the omnivorous fish community. CED was weakly positively related with TP corrected Chl a, but the strength of the relationship differed between MHTs. In contrast, CP was consistently positively related with Chl a in the entire dataset. CED did not contribute to top down or bottom up relationships. The application of metabolic variables characterizing fish community feeding and production rates makes these results robust because the approach accounted for the usually neglected effects of fish size and temperature in across lake comparisons. Our results suggest that bottom up effects from phytoplankton on fish secondary production in lakes are substantially stronger than top down effects from fish on phytoplankton biomass. 65 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85083688068 origin=inward articolo preprint 16687160.pdf Articolo in rivista American Society of Limnology and Oceanography, 1939 5590 Limnology and oceanography Online Limnology and oceanography Online Limnol. oceanogr. Online Limnology and oceanography Online pietro.volta VOLTA PIETRO |
