Population structure and reproduction of Deuterodon langei travassos, 1957 (Teleostei, Characidae) in a neotropical stream basin from the Atlantic Forest, Southern Brazil

Brazilian Archives of Biology and Technology

Jean Ricardo Simões Vitule¹  Marcelo Rennó Braga¹  José Marcelo Rocha Aranha¹ 

[1] ,Universidade Federal do Paraná Setor de Ciências Biológicas Departamento de ZoologiaCuritiba PR ,Brasil

关键词: Characins;    Tropical fish;    Longitudinal segregation;    Distribution;    Reproductive period;    Serra do Mar;   

DOI  :  10.1590/S1516-89132008000600014

来源: SciELO

【 摘 要 】

Aspects of the biology of D. langei were studied at different sites along a longitudinal gradient formed by the Ribeirão stream basin, a Neotropical stream of the Atlantic Forest, southern Brazil. Differences were observed in population structure and reproduction along the longitudinal gradient and during the study period. Juvenile fishes occurred in high abundance, mainly in the downstream site after the rainy months. Adults occurred mainly in the intermediate and upstream sites. During their life cycle, adults optimise their reproductive strategy by concentrating the reproductive period with total spawn in a short time interval before summer rains dragged the juvenile, larval forms and/or eggs downstream. The downstream site was characterized by a wide range of microhabitats (ex. submerged grass and shallow flooded area). Thus, the species used different portions of the basin in distinct stages of its life, being ecologically adapted to variation patterns in its temporal and physical environments.

【 授权许可】

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