Population structure and fecundity of the hermit crab Clibanarius antillensis Stimpson 1862 (Anomura, Diogenidae) in southeastern Brazil

Abstract

The population structure and fecundity of Clibanarius antillensis at the rocky shore of Praia Grande, Sao Sebastiao, Sao Paulo State, southeastern Brazil, was studied. Sexual dimorphism was verified, with males reaching larger sizes than females. Population sex ratio was skewed for females, which predominated in the smallest size classes, while males predominated in the largest ones. Size frequency distribution revealed a bimodal pattern correlated with seasonal differences in crab size. Reproductive season was continuous, with a peak of reproductive activity from November to March. Fecundity was positively correlated with crabs shield length and larger broods were found to be produced in relatively heavier (larger) shells. Thus, shells influenced both crab and consequently, brood size, probably by regulating individual growth and reproductive activity of females.64228128