Reproductive patterns of Aratus pisonii (Decapoda Grapsidae) from an estuarine area of São Paulo Northern Coast, Brazil

• Maria Helena de Arruda Leme ^[1] ; Maria Lucia Negreiros-Fransozo ^[1]
  1. [1] Universidade Estadual Paulista

     Universidade Estadual Paulista

     Brasil

     
• Localización: Revista de Biología Tropical, ISSN 0034-7744, Vol. 46, Nº. 3, 1998, págs. 673-678
• Idioma: inglés
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• Resumen

  • This paper describes the frequency of occurrence and reproductive patterns of the tree mangrove crab Aratus pisonii. Monthly samples were taken from January 1993 to June 1994 in an estuarine mangrove from Ubatuba region. Brazil. A total of 1 078 animals 489 males and 589 females (131 ovigerous females) were collected. Carapace width ranged from 4.2 to 25.9 mm. A summer reproductive peak followed by a recruitment juvenile pulse was verified. Females were more abundant than males in the intermediate size classes. The sex-ratio in several months was biased towards females, suggesting a poligynous population and migration of females to mangrove fringes at the time of incubation and apawning.