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

Published online by Cambridge University Press:  14 March 2002

Reinaldo José de Castro ,
Keshiyu Nakatani ,
Andréa Bialetzki ,
Paulo Vanderlei Sanches  and
Gilmar Baumgartner
Reinaldo José de Castro
Affiliation:
Instituto de Biociências, Universidade Estadual Paulista (UNESP), Campus de Botucatu, Distrito de Rubião Jr. s/n, 18618-000, Botucatu, São Paulo, Brazil
Keshiyu Nakatani
Affiliation:
Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura -Nupélia, Paraná, Brazil Universidade Estadual de Maringá (UEM), Departamento de Biologia, Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brazil
Andréa Bialetzki
Affiliation:
Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura -Nupélia, Paraná, Brazil Universidade Estadual de Maringá (UEM), Departamento de Biologia, Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brazil
Paulo Vanderlei Sanches
Affiliation:
Universidade Estadual de Maringá (UEM), Departamento de Biologia, Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brazil Universidade Paranaense (UNIPAR), Av. Parigot de Souza, 3636, Toledo, Paraná, Brazil
Gilmar Baumgartner
Affiliation:
Universidade Estadual de Maringá (UEM), Departamento de Biologia, Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brazil 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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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.

Keywords

temporal distributionichthyoplanktonfloodplainParaná River
Type
Research Article
Information
Journal of Zoology , Volume 256 , Issue 4 , April 2002 , pp. 437 - 443
Copyright
2002 The Zoological Society of London

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