Ecologia do caranguejo Austinixa aidae (Righi, 1967) (Crustacea: Brachyura: Pinnotheridae) de uma praia arenosa do litoral Norte do Estado de São Paulo / Ecology of symbiotic crab Austinixa aidae (RIGHI, 1967) (Crustacea: Brachyura: Pinnotheridae) from a sand beach in north shore of State of São Paulo

AUTOR(ES)

Douglas Fernando Peiró

DATA DE PUBLICAÇÃO

2008

RESUMO

The biological and ecological aspects of Austinixa aidae, a symbiotic crab inhabiting burrows of the Thalassinidea ghost shrimp Callichirus major, from Perequê-Açu beach, Ubatuba, North shore of State of São Paulo, Brazil, were studied. The samples were conducted bimonthly with manual suction pumps in the intertidal region of the sand beach, from May/2005 to September/2006. This project was subdivided into three chapters: Population Structure, Relative growth and Reproductive Strategies. In Chapter I, the population of A. aidae was determined in terms of seasonal abundance, size frequency distribution, sex ratio, density and incidence in the burrows of the thalassinids, reproductive and recruitment periods. In addition, were evaluated the correlations between its density and size with size of their respective hosts. Was found that Austinixa species posses similar biological and ecological aspects, even in distant localities. In Chapter II, due to sexual dimorphism and the morphological adaptations assigned to symbiotic life style, body features, relative growth, maturity and sexual dimorphism were studied. Adults of A. aidae have the carapace width on average 2.4 times the carapace length. Relative growth revealed that morphological changes are related to sexual maturity of this species. In Chapter III, the goal was to know the reproductive strategy related to production of eggs, to determine the fecundity of ovigerous females of different sizes and different periods, conditions of the development of eggs, and their parameters (diameter and volume). A. aidae presented patterns of reproductive strategy similar to other Decapoda crustaceans, with evidence of reproductive efficiency where this population is established. Due to a lack of population and reproductive studies for this species, this study aimed to supply this demand in the scientific literature.

ASSUNTO(S)

marine biology relative biologia marinha oceanografia biológica reproductive biology biologia reprodutiva biologia populacional biologic oceanography population biology

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