Diferen?a entre dois métodos de coleta utilizados na captura de crustáceos decápodes em um rio da Esta??o Ecológica Juréia-Itatins, S?o Paulo

摘要

Sampling collections were taken quarterly from Fall 2000 to Summer 2001 at Juréia-Itatins Ecological Station using two different sampling methods (hand sieve and traps). Comparing both sampling methods one can verify differences in faunal composition, richness, degree of dominance, evenness and size and number of individuals. Moreover, the sex ratio of Macrobrachium acanthurus (Wiegmann, 1836) may differ according to the sampling method. Decapod crustaceans are known to inhabit a great variety of habitats and niches, therefore to obtain an effective qualitative and/or quantitative sampling, in which the majority of decapod species are collected, the use of more than one sampling method is recommended.