Distribuição ecológica e dinâmica populacional do camarão sete-barbas Xiphopenaeus kroyeri(Heller, 1862) (Crustacea: Decapoda) no complexo Baia/Estuário de Santas e Sâo Vicente, SP
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Data
2010-02-19
Autores
Heckler, Gisele Salgado [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
o presente estudo teve como objetivo averiguar a abundância do camarão sete-barbas, Xiphopenaeus kroyeri, e a influência de fatores ambientais como temperatura e salinidade da água de fundo e textura e porcentagem de matéria orgânica do sedimento, na distribuição espaçotemporal da espécie ao longo do complexo Baía/Estuário de Santos e São Vicente. As amostragens foram realizadas mensalmente de junho de 2008 a maio de 2009 em quatro pontos no Estuário de São Vicente e quatro na Baía de Santos em profundidades que variaram de 3 a 15 metros, aproximadamente. As amostras de água de fundo foram obtidas para se determinar a temperatura e a salinidade e as amostras de sedimento foram utilizadas para análise da fração granulométrica e da porcentagem de matéria orgânica de cada ponto. Os valores da salinidade média no estuário variaram de 24,5 Uulho) a 32,5 psu (outubro) e na baía, de 32,5 Uulho) a 39,5 psu (setembro). Foi observada uma menor amplitude de variação nos valores de temperatura no estuário, entre 21,7°C Uulho) e 29,5°C (março), quando comparada com a baía, entre 18,2 (dezembro) e 28,O°C (fevereiro). Em todos os pontos da baía, a fração granulométrica que prevaleceu foi de areia muito fina e no estuário, houve uma variação de silte e argila a areia fina. Com exceção de um dos pontos do estuário, a porcentagem de matéria orgânica foi sempre menor que 3. Dos 60.274 indivíduos coletados, nenhum foi capturado no estuário e este fato pode estar relacionado à baixa salinidade observada no local. Desse modo, a espécie deve ser incluída no ciclo de vida tipo 111, ou seja, o ciclo de vida completa-se em regiões costeiras marinhas. Já a temperatura...
The aim of the present study was to analyze the abundance of the seabob shrimp, Xiphopenaeus kroyeri, and the influence of environmental factors as temperature and salinity (bottom water), organic matter content and grain size of sediments, in the spatial-temporal distribution of the species along the complex Bay/Estuary of Santos and São Vicente. Samples were taken monthly between June 2008 and May 2009 in four sites in São Vicente Estuary and four sites in Santos Bay in depths from 3 to 15m. The bottom water samples were obtained to determine the temperature and salinity and the sediment samples to analyze the grain size and organic matter content of each site. The mean values of salinity varied in the estuary from 25.5 (July) to 32.5 psu (October) and, in the bay, from 32.5 (July) to 39.5 psu (September). It was observed lower amplitude of variation in temperature values in the estuary, between 21.7 (July) and 29.5°C (March) when compared with the bay, between 18.2 (December) and 28.0°C (February). In ali sites in the bay, it was observed predominance of very fine sand and, in the estuary, there was a variation from silt and clay and fine sand. Excepting one site in the estuary, the percentage of organic matter content was always lower than 3. In a total of 60,274 individuais obtained, none of them was caught in the estuary and this fact can be related with low values of salinity observed in the local. Thus the species has to be included in the life cycle type 3, which is completed from the inshore to offshore areas. High values of temperature were determinants when associated with adult males and matured females. The species remained in the region ali year round and low temperatures have forced a population migration to lower depths... (Complete abstract click electronic access below)
The aim of the present study was to analyze the abundance of the seabob shrimp, Xiphopenaeus kroyeri, and the influence of environmental factors as temperature and salinity (bottom water), organic matter content and grain size of sediments, in the spatial-temporal distribution of the species along the complex Bay/Estuary of Santos and São Vicente. Samples were taken monthly between June 2008 and May 2009 in four sites in São Vicente Estuary and four sites in Santos Bay in depths from 3 to 15m. The bottom water samples were obtained to determine the temperature and salinity and the sediment samples to analyze the grain size and organic matter content of each site. The mean values of salinity varied in the estuary from 25.5 (July) to 32.5 psu (October) and, in the bay, from 32.5 (July) to 39.5 psu (September). It was observed lower amplitude of variation in temperature values in the estuary, between 21.7 (July) and 29.5°C (March) when compared with the bay, between 18.2 (December) and 28.0°C (February). In ali sites in the bay, it was observed predominance of very fine sand and, in the estuary, there was a variation from silt and clay and fine sand. Excepting one site in the estuary, the percentage of organic matter content was always lower than 3. In a total of 60,274 individuais obtained, none of them was caught in the estuary and this fact can be related with low values of salinity observed in the local. Thus the species has to be included in the life cycle type 3, which is completed from the inshore to offshore areas. High values of temperature were determinants when associated with adult males and matured females. The species remained in the region ali year round and low temperatures have forced a population migration to lower depths... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Camarão - População, Santos (SP), São Vicente (SP), Reproductive biology
Como citar
HECKLER, Gisele Salgado. Distribuição ecológica e dinâmica populacional do camarão sete-barbas Xiphopenaeus kroyeri(Heller, 1862) (Crustacea: Decapoda) no complexo Baia/Estuário de Santas e Sâo Vicente, SP. 2010. 111 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociêcias de Botucatu, 2010.