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Distribution and abundance patterns of decapod crustaceans in the Sado estuary, Portugal

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[The decapod crustacean community of the Sado estuary was sampled monthly, between May 2001 and April 2002, using a 4 m beam trawl with 10 mm mesh size. The assemblage was composed of 33 species (9 Natantia and 24 species of Reptantia). Only 5 species (Crangon crangon, Macropodia rostrata, Pilumnus hirtellus, Carcinus maenas, and Liocarcinus navigator) were present in more than 40% of the samples. Few species dominated the community: C. crangon and C. maenas were the most important species in numbers (accounting for 63% and 17% of the total number of individuals, respectively), while C. maenas, Maja brachydactyla, and C. crangon dominated in biomass (73%, 9%, and 8%, respectively). A marked spatial and seasonal pattern was noticed: the inner areas, with shallower depth, less water transparency, and lower salinity, presented a high abundance of C. crangon, while in the outer areas a more diverse assemblage was found. In spring and summer, species richness increased, mainly in the lower estuary. The dominant species Crangon crangon and Carcinus maenas were more abundant in winter. A comunidade de crustáceos do estuário do sado foi amostrada mensalmente, entre Maio de 2001 e Abril de 2002, com recurso a um arrasto de vara com 4 m de largura e com uma malha da rede de 10 mm. Foram identificadas 33 espécies (9 espécies de Natantia e 24 de Reptantia). Apenas 5 espécies (Crangon crangon, Macropodia rostrata, Pilumnus hirtellus, Carcinus maenas e Liocarcinus navigator) estiveram presentes em mais de 40% das amostras. Poucas espécies dominaram a comunidade: C. crangon e C. maenas foram as mais importantes em número de indivíduos (representando 63% e 17% do total de indivíduos capturados, respectivamente), enquanto C. maenas, Maja brachydactyla e C. crangon dominaram em biomassa (73%, 9% e 8%, respectivamente). Foi registado um padrão espacio-temporal bem marcado: as áreas mais a montante, com menor profundidade, transparência da água e salinidade, apresentaram uma abundância elevada de C. crangon, enquanto nas áreas mais próximas da embocadura foi encontrada uma comunidade mais diversificada. Na Primavera e no Verão verificou-se um aumento da riqueza específica, especialmente no estuário inferior. As espécies dominantes Crangon crangon e Carcinus maenas foram mais abundantes no Inverno., The decapod crustacean community of the Sado estuary was sampled monthly, between May 2001 and April 2002, using a 4 m beam trawl with 10 mm mesh size. The assemblage was composed of 33 species (9 Natantia and 24 species of Reptantia). Only 5 species (Crangon crangon, Macropodia rostrata, Pilumnus hirtellus, Carcinus maenas, and Liocarcinus navigator) were present in more than 40% of the samples. Few species dominated the community: C. crangon and C. maenas were the most important species in numbers (accounting for 63% and 17% of the total number of individuals, respectively), while C. maenas, Maja brachydactyla, and C. crangon dominated in biomass (73%, 9%, and 8%, respectively). A marked spatial and seasonal pattern was noticed: the inner areas, with shallower depth, less water transparency, and lower salinity, presented a high abundance of C. crangon, while in the outer areas a more diverse assemblage was found. In spring and summer, species richness increased, mainly in the lower estuary. The dominant species Crangon crangon and Carcinus maenas were more abundant in winter. A comunidade de crustáceos do estuário do sado foi amostrada mensalmente, entre Maio de 2001 e Abril de 2002, com recurso a um arrasto de vara com 4 m de largura e com uma malha da rede de 10 mm. Foram identificadas 33 espécies (9 espécies de Natantia e 24 de Reptantia). Apenas 5 espécies (Crangon crangon, Macropodia rostrata, Pilumnus hirtellus, Carcinus maenas e Liocarcinus navigator) estiveram presentes em mais de 40% das amostras. Poucas espécies dominaram a comunidade: C. crangon e C. maenas foram as mais importantes em número de indivíduos (representando 63% e 17% do total de indivíduos capturados, respectivamente), enquanto C. maenas, Maja brachydactyla e C. crangon dominaram em biomassa (73%, 9% e 8%, respectivamente). Foi registado um padrão espacio-temporal bem marcado: as áreas mais a montante, com menor profundidade, transparência da água e salinidade, apresentaram uma abundância elevada de C. crangon, enquanto nas áreas mais próximas da embocadura foi encontrada uma comunidade mais diversificada. Na Primavera e no Verão verificou-se um aumento da riqueza específica, especialmente no estuário inferior. As espécies dominantes Crangon crangon e Carcinus maenas foram mais abundantes no Inverno.]

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/content/journals/10.1163/156854007779696451
2007-01-01
2016-12-11

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