Studies were carried out on structure and dynamics of fish assemblages in the Baguaçu tidal creek, Paranaguá Bay, Brazil. A total of 30,104 fish were captured, comprising 21 families and 47 species. Both in weight and in number, the species Anchoa parva prevailed. Monthly captures in number and weight were largest in the autumn and part of the winter. No seasonal tendency was observed in the indexes of community structure. The dendrogram produced by the classification of the samples separated the 12 months of collection into three groups, reflecting differences in the qualitative and quantitative occurrences of the most important taxa. Some ecological likeness, not only seasonal patterns of abundance, seemed evident in the seasonality of the groupings of species revealed through the cluster analysis. The principal component analysis reflected mainly the periods of rain and drought
As amostras foram obtidas mensalmente na baixa-mar de quadratura na Gamboa do Baguaçu, Baía de Paranaguá, Brasil, com uma rede tipo picaré, com malha de 1mm, 30 m de comprimento e 3 m de altura. Foram capturados 30104 peixes pertencentes a 21 famílias e 47 espécies. A espécie Anchoa parva foi a mais abundante, tanto em número como em peso. As capturas em número e peso foram maiores no outono e parte do inverno. Nenhuma tendência sazonal foi observada nos índices da estrutura da comunidade. O agrupamento dos meses definidos pela análise de cluster normal refletiram diferenças na ocorrência qualitativa e quantitativa dos taxa mais importantes. Algumas afinidades ecológicas, e não somente os padrões sazonais de abundância, parecem evidentes na sazonalidade dos agrupamentos de espécies revelados através da análise de cluster. A análise de componentes principais reflete principalmente os períodos de chuva e seca
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