Bioecology of the crab Ucides cordatus (Crustacea, Decapoda) in mangroves influenced by the Amazon River, Brazil

Acta Amazonica

Kárlia Dalla Santa Amaral²  Inácia Maria Vieira¹  Frederico Moreira Osório¹  Joana D'arc Mauricio Rocha¹  Jô De Farias Lima² 

[1] ,Empresa Brasileira de Pesquisa Agropecuária Embrapa Amapá Macapá Amapá ,Brazil

关键词: State of Amapá;    reproductive dynamics;    population structure;    fishery resource;    Estado do Amapá;    dinâmica reprodutiva;    estrutura populacional;    recurso pesqueiro;   

DOI  :  10.1590/S0044-59672014000200007

来源: SciELO

【 摘 要 】

The mangrove crab (Ucides cordatus) is a valuable fishery resource, overfished along the Brazilian coast. This study aimed to obtain bioecological data on this crab along the coast of the State of Amapá. Six bimonthly samplings were conducted between December 2008 and January 2010. Transects were used to estimate the density (burrows m-2) and population abundance (individuals m-2). All the animals were subjected to biometrics, with females being classified according to their stage of gonadal maturation. The mean density (1.09 burrows m-2) and abundance (0.31 individuals m-2) were influenced by the climate with the highest values in summer (1.17 burrows m-2 and 0.34 individuals m-2). The male to female ratio was 1.38:1 showing significant difference in the proportion of sexes. The individuals showed sexual dimorphism, with linear measurements significantly higher in males. The sampled animals also had larger carapace length and width (CL and CW) compared to crabs studied in other Brazilian states. There was a positive relationship between CW and CL and individual weight (IW) and CW for males (R² = 0.83 and 0.90) and females (R² = 0.79 and 0.84). The growth was negative allometric (CL increases to a lesser extent than CW) for both sexes. The highest frequency of ovigerous females (78%) and in maturation stage IV (38%) occurred in the CW size class between 59.8 and 67.5 mm. The peak of mature females occurred in May and August, showing a reproductive period different from those in other Brazilian states.

【 授权许可】

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