Differences in food webs and trophic states of Brazilian tropical humid and semi-arid shallow lakes: implications of climate change

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  • Rosemberg Menezes, Univ Fed Paraiba, Universidade Federal da Paraiba, Universidade Federal do Rio Grande do Norte
  • ,
  • José Luiz Attayde, Universidade Federal do Rio Grande do Norte, Brasilien
  • Sarian Kosten, Radboud University, Wageningen University, Wageningen, Netherlands., Holland
  • Gissell Lacerot, Universidad de la República, Uruguay
  • Leonardo Coimbra e Souza, Universidade Federal do Estado do Rio de Janeiro, Brasilien
  • Luciana S. Costa, Universidade Federal do Rio de Janeiro, Brasilien
  • Leonel da S.L. Sternberg, University of Miami, USA
  • Anna Claudia dos Santos, Universidade Federal de Goiás
  • ,
  • Michele de Medeiros Rodrigues, Universidade Federal do Rio Grande do Norte, Brasilien
  • Erik Jeppesen

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.

Sider (fra-til)95-111
Antal sider17
StatusUdgivet - feb. 2019

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