Ciências Biológicas: Biologia Animal
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Navegando Ciências Biológicas: Biologia Animal por Autor "Almeida, Renato de"
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- ItemDistribuição e estrutura da população de Callinectes danae Smith, 1869 (Crustacea, Decapoda, Portunidae) na Baía Noroeste de Vitória, Espírito Santo, Brasil(Universidade Federal do Espírito Santo, 2007-03-30) Sforza, Roberto; Nalesso, Rosebel Cunha; Fernandes, Luiz Fernando Loureiro; Almeida, Renato de; Joyeux, Jean ChristopheThe swimming crabs Callinectes danae (Portunidae) are abundant in Brazilian estuaries, being an important iten to artisanal fisheries. Spatial and seasonal distribution of C.danae in the Northwest Vitoria Bay, southeast Brazil, were investigated by night trawl through monthly sampling during one year (Dec/00 to Nov/01 N=72), with physico-chemical parameters of water measured in situ on each of the six sampling stations, located through the bay on three areas sub-divided in shallow and deep ones, along a transversal axis. A total of 3879 individuals was collected, being 2537 females (1147 adults, 318 ovigerous and 1072 juveniles) and 1339 males (444 adults and 895 juveniles). Mean carapace width (including lateral spines) at sexual maturity was 9,13 cm for males and 8,05 cm for females, and sex ratio was 1,89?1?. Ovigerous females occurred the whole year (except on Nov/01), with higher densities on February, July and October/01, almost exclusively in the southern part of sampling area, which showed higher salinities and lower temperatures due to coastal waters entering throw the harbor channel. Adult males and juveniles of both sexes occurred mainly in north and central parts of sampling areas, with lower salinities and higher water temperatures due to the discharges of Santa Maria and Bubu rivers; their densities were higher on December/00, October and November/01. Adult females showed homogeneous densities along the bay and sampling months