Epipelon, phytoplankton and zooplankton responses to the experimental oligotrophication in a eutrophic shallow reservoir

Autor(es)

Amaral, Luyza Mayary ; de Almeida Castilho, Maria Carolina ; Henry, Raoul ; Ferragut, Carla

• Tipo de documento: Artigo Científico
• Fonte: Environmental Pollution; v. 263, p. 10-pg., 2020-08-01.

Resumo

Epipelon can contribute to the maintenance of shallow lake oligotrophication. Herein, we simulated oligotrophication by diluting eutrophic water and evaluated epipelon biomass and structure and potential relationships with phytoplankton and zooplankton communities. Dilutions of 25-75% negatively impacted phytoplankton biomass and zooplankton diversity and increased Rotifera density. Additionally, the 25% dilution increased Copepoda density, but had no effect on Cladocera. On both experimental days, epipelon chlorophyll-a and algal density responded to oligotrophication, but the algal biomass response was less pronounced after 14 days. Ceratium furcoides was dominant in the phytoplankton, while diatom species were dominant in the epipelon. We observed that experimental oligotrophication can influence both the biomass and taxonomic structure of the algal and zooplankton communities. Overall, we concluded that experimental oligotrophication negatively impacted the phytoplankton biomass and favored the development of the phototrophic epipelon; however, a large reduction in eutrophication (>50%) is required for a significant algal response in the benthic environment of a shallow tropical reservoir. (c) 2020 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 17/50341-0 - Desafios para conservação da biodiversidade frente às mudanças climáticas, poluição e uso e ocupação do solo (PDIp)
• Beneficiário: Luiz Mauro Barbosa
• Modalidade de apoio: Auxílio à Pesquisa - Programa Modernização de Institutos Estaduais de Pesquisa