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Differences in food webs and trophic states of Brazilian tropical humid and semi-arid shallow lakes: implications of climate change |
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| Authors: | Menezes Rosemberg Fernandes Attayde José Luiz Kosten Sarian Lacerot Gissell e Souza Leonardo Coimbra Costa Luciana S. da S. L. Sternberg Leonel dos Santos Anna Claudia de Medeiros Rodrigues Michele Jeppesen Erik |
| Affiliation: | 1.Departamento de Fitotecnia e Ciência Ambientais, Centro de Ciências Agrárias, Universidade Federal da Paraíba, Areia, Paraíba, Brazil ;2.Departamento de Ecologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil ;3.Department of Aquatic Ecology and Environmental Biology, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands ;4.Ecología Funcional de Sistemas Acuáticos, Centro Universitario Regional del Este, Universidad de la República, Rocha, Uruguay ;5.Departamento de Zoologia, Instituto de Biologia (IB), Núcleo de Estudos Limnológicos (NEL), Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil ;6.Departamento de Botânica, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil ;7.Department of Biology, University of Miami, Coral Gables, FL, USA ;8.Department of Bioscience, Aarhus University, Silkeborg, Denmark ;9.Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing, China ;10.Aquatic Ecology and Water Quality Management Group, Wageningen University, Wageningen, The Netherlands ;11.Laboratório de Processamento de Imagens e Geoprocessamento, Universidade Federal de Goiás, Goiânia, Goiás, Brazil ; |
| Abstract: | Global warming may intensify eutrophication of shallow lakes by affecting nutrient loading, evaporation rates, and water level and thus produce major changes in food webs. We investigated to what degree food webs in tropical humid lakes differed from those in more eutrophic semi-arid lakes of the same latitude. Our results indicate that the catchment area-to-lake area ratio, nutrients, chlorophyll a, suspended solids, abundances of phytoplankton, zooplankton, and omnivorous fish as well as total fish catch per unit effort were all higher in the semi-arid lakes, whereas inlet water-to-evaporation ratio (proxy for water balance), water transparency, percentage macrophytes cover, and the piscivores:omnivores ratio were higher in the humid lakes. Our results suggest that reduced inlet water-to-evaporation ratio will increase lake eutrophication, which, in turn, as in temperate regions, will alter trophic structure of the freshwater community. |
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