Based on recent surveys of the freshwater decapod fauna, distributional data of five exotic species of freshwater decapod crustaceans for the hydrographic basins of the state of Sa˜o Paulo are presented, as part of a large initiative for a comprehensive survey of the state's biodiversity (BIOTA-FAPESP Program). These species are the North American crayfish Procambarus clarkii (Girard) (Cambaridae), the crab Dilocarcinus pagei Stimpson (Trichodactylidae) from the Amazon and Paraguay/lower Parana´River Basins, and the palaemonid shrimps Macrobrachium rosenbergii (De Man), from the Indo-Pacific region, Macrobrachium amazonicum (Heller) and Macrobrachium jelskii (Miers), both from the Orinoco, Amazon and the Paraguay/lower ParanaŔ iver Basins. Possible modes by which their introduction might have occurred are commented upon and potential consequences are discussed.
Este trabalho contribui para o conhecimento da riqueza de espécies de crustáceos decápodes do vale do Ribeira de Iguape, região sul do estado de São Paulo. Foram realizadas amostragens em seis Parques Estaduais (Campina do Encantado, Intervales, PETAR, Carlos Botelho, Jacupiranga e Ilha do Cardoso) e na Estação Ecológica Juréia-Itatins, abrangendo grande parte do remanescente de Mata Atlântica da região da bacia do rio Ribeira de Iguape. As coletas foram realizadas sazonalmente durante os anos 2000 e 2001, empregando dois métodos de amostragem (peneira e armadilha com isca). Foram registradas 18 espécies de crustáceos decápodes: Palaemonidae (6), Atyidae (3), Aeglidae (5), Trichodactylidae (3) e Grapsidae (1).
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