Biologia populacional de Astyanax altiparanae Garutti & Britski (Teleostei, Characidae) do médio Rio Paranapanema, Paraná, Brasil
Carregando...
Data
2004-06-01
Autores
Orsi, Mário Luís
Carvalho, Edmir Daniel [UNESP]
Foresti, Fausto [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Zoologia
Resumo
O objetivo desse trabalho foi a determinação da estrutura populacional da espécie. Foram escolhidos quatro locais de amostragem com características ambientais distintas na bacia do rio Tibagi. As amostragens foram realizadas mensalmente no período de janeiro de 1997 a fevereiro de 1998. Um total de 1553 indivíduos foram capturados, apresentando constância em todos os trechos, com as maiores abundâncias nos trechos do rio Congonhas (76 %). Variações ocorreram entre os trechos por fase de desenvolvimento e classes de comprimento e na distribuição espacial, demonstrando que a espécie apresenta estrutura populacional diferenciada. A espécie apresentou grande capacidade adaptativa exploratória, utilizando estratégias diferenciadas na estrutura da população. A espécie apresentou uma forte tendência ao comportamento r estrategista. O melhor desenvolvimento foi identificado em Congonhas I, talvez devido a existência de condições ambientais favoráveis a manutenção da espécie.
This study was carried out with the following objective: determine the Astyanax altiparanae population structure. Four localities in the Paranapanema river basin were chosen (low Tibagi river) with distinct environmental characteristics. Sampling was carried out monthly from January 1997 to February 1998. A total of 1553 individuals were captured with constancy in all the river extensions, with greatest abundance in the Congonhas river (76%). There was variation among the river extensions in the development phase, length class and spatial distribution of the captured specimens, showing that the species has a differentiated population structure although with similar growth. Therefore, the results suggested that the species has a great adaptive capacity to exploit and using differentiated strategies in terms of population structure. This showed that the species has a strong tendency to r strategic behavior. It showed, however, preference for developing all its biological cycle at the Congonhas river first extension. This was probably due to environmental conditions favorable to the maintenance of the specie.
This study was carried out with the following objective: determine the Astyanax altiparanae population structure. Four localities in the Paranapanema river basin were chosen (low Tibagi river) with distinct environmental characteristics. Sampling was carried out monthly from January 1997 to February 1998. A total of 1553 individuals were captured with constancy in all the river extensions, with greatest abundance in the Congonhas river (76%). There was variation among the river extensions in the development phase, length class and spatial distribution of the captured specimens, showing that the species has a differentiated population structure although with similar growth. Therefore, the results suggested that the species has a great adaptive capacity to exploit and using differentiated strategies in terms of population structure. This showed that the species has a strong tendency to r strategic behavior. It showed, however, preference for developing all its biological cycle at the Congonhas river first extension. This was probably due to environmental conditions favorable to the maintenance of the specie.
Descrição
Palavras-chave
Ecologia, peixes, Tibagi, Ecology, fish, Tibagi
Como citar
Revista Brasileira de Zoologia. Sociedade Brasileira de Zoologia, v. 21, n. 2, p. 207-218, 2004.