Temporal distribution and composition of the ichthyoplankton from Leopoldo's Inlet on the Upper Paraná River floodplain (Brazil)

Authors

  • Reinaldo José de Castro,

    1. Instituto de Biociências, Universidade Estadual Paulista (UNESP), Campus de Botucatu, Distrito de Rubião Jr. s/n, 18618-000, Botucatu, São Paulo, Brazil
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  • Keshiyu Nakatani,

    1. Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura -Nupélia, Paraná, Brazil
    2. Universidade Estadual de Maringá (UEM), Departamento de Biologia, Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brazil
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  • Andréa Bialetzki,

    Corresponding author
    1. Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura -Nupélia, Paraná, Brazil
    2. Universidade Estadual de Maringá (UEM), Departamento de Biologia, Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brazil
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  • Paulo Vanderlei Sanches,

    1. Universidade Estadual de Maringá (UEM), Departamento de Biologia, Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brazil
    2. Universidade Paranaense (UNIPAR), Av. Parigot de Souza, 3636, Toledo, Paraná, Brazil
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  • Gilmar Baumgartner

    1. Universidade Paranaense (UNIPAR), Av. Parigot de Souza, 3636, Toledo, Paraná, Brazil
    2. Centro de Engenharias e Ciências Exatas, Universidade Estadual do Oeste do Paraná (UNIOESTE), Rua da Faculdade, 2550, 87030-900, Toledo, Paraná, Brazil
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*All correspondence to: Andréa Bialetzki, Universidade Estadual de Maringá (UEM), Departamento de Biologia, Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brazil. E-mail: bialetzki@nupelia.uem.br

Abstract

Temporal distribution and composition of ichthyoplankton and their relationships with some environmental variables of Leopoldo's Inlet (Ressaco do Leopoldo) on the upper Paraná River floodplain, southern Brazil, were analysed. Samples were taken from February 1991 to February 1992, and 3480 larvae were collected. The highest density of larvae was observed in November 1991 (36.79 larvae/10 m3) at night (night/day ratio 7: 1). Species composition showed a predominance of Characiformes (80%). There was a high density (4.28 larvae/10 m3) of Bryconamericus stramineus throughout almost the whole study period. The majority of the species were more frequently collected at night. Pearson's correlation indicated a relationship between larval density, temperature, and pluviometric index. Leopoldo's Inlet, whose ichthyofauna is mainly composed of grazing and resident species, shows favourable conditions for fish reproduction and development.

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