Influence of limnological zones on the spatial distribution of fish assemblages in three Brazilian reservoirs

  • Bárbara Becker | barbara_becker@ymail.com Pontifícia Universidade Católica de Minas Gerais, Brazil.
  • Bárbara de Oliveira Sanches Galhardo Pontifícia Universidade Católica de Minas Gerais, Brazil.
  • Diego Rodrigues Macedo Universidade Federal de Minas Gerais, Brazil.
  • Robert M. Hughes Amnis Opes Institute and Oregon State University, United States.
  • Marcos Callisto Universidade Federal de Minas Gerais, Brazil.
  • Gilmar B. Santos Pontifícia Universidade Católica de Minas Gerais, Brazil.

Abstract

Reservoirs can have both positive and negative effects on differing fish species depending on the species concerned and reservoir morphology, flow regime, and basin location.  We assessed the influence of limnological zones on the ichthyofauna of three large Neotropical reservoirs in two different river basins. We sampled fish through use of gill nets set at 40 systematically selected sites on each reservoir. We used satellite images, algae, and suspended solids concentrations to classify those sites as lacustrine or riverine. We observed significant differences in assemblage composition between riverine and lacustrine zones of each reservoir. We either tested if the same region (lacustrine or riverine) showed the same patterns in different reservoirs. In São Simão, the riverine zone produced greater abundances of native species, long-distance migratory species, diversity, and richness, whereas the lacustrine zone supported greater total and non-native species abundances. Conversely, in Três Marias, the riverine zone supported greater total and non-native species abundances, whereas the others traits evaluated did not differ significantly between zones. Only lacustrine sites occurred in Volta Grande Reservoir. The same zones in the three reservoirs usually had significantly different patterns in the traits evaluated. The differences in spatial patterns observed between reservoirs could be explained partly by the differing morphologies (complex versus linear), the differential influence of tributaries of each reservoir and basin positions (presence or absence of upstream dams) of the reservoirs.

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Author Biographies

Bárbara Becker, Pontifícia Universidade Católica de Minas Gerais
Programa de Pós-Graduação em Biologia de Vertebrados
Bárbara de Oliveira Sanches Galhardo, Pontifícia Universidade Católica de Minas Gerais
Programa de Pós-Graduação em Biologia de Vertebrados
Diego Rodrigues Macedo, Universidade Federal de Minas Gerais
Departamento de Biologia Geral, Instituto de Ciências Biológicas
Robert M. Hughes, Amnis Opes Institute and Oregon State University
Department of Fisheries and Wildlife
Marcos Callisto, Universidade Federal de Minas Gerais
Departamento de Biologia Geral, Instituto de Ciências Biológicas
Gilmar B. Santos, Pontifícia Universidade Católica de Minas Gerais
Programa de Pós-Graduação em Biologia de Vertebrados
Published
2015-09-28
Info
Issue
Section
Original Articles
Supporting Agencies
Centrais Energéticas de Minas Gerais (CEMIG) – Programa Peixe-Vivo, Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)
Keywords:
Upper Paraná Basin, Upper São Francisco Basin, fish assemblages, zonation, dam effects
Statistics
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How to Cite
1.
Becker B, Galhardo B de OS, Macedo DR, Hughes RM, Callisto M, Santos GB. Influence of limnological zones on the spatial distribution of fish assemblages in three Brazilian reservoirs. J Limnol [Internet]. 2015Sep.28 [cited 2021May7];75(1). Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2015.1266

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