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Population estimation and site fidelity of the land crab Cardisoma guanhumi (Decapoda: Brachyura: Gecarcinidae) on Vieques Island, Puerto Rico

2012; Oxford University Press; Volume: 32; Issue: 3 Linguagem: Inglês

10.1163/193724012x626467

1937-240X

Russell A. Forsee, Marc Albrecht,

Fish biology, ecology, and behavior

Overharvesting of the land crab Cardisoma guanhumi (Latreille, 1828) has occurred in some locations including Puerto Rico. We placed passive integrated transponder (PIT) tags in this crab, C. guanhumi, to estimate a population on the southern coast of Vieques island, Puerto Rico. We were able to recapture marked animals approximately 1 year after tagging. We estimated the population of C. guanhumi on the southern central coast Vieques to be approximately 29 000 individuals. The recapture locations of individuals averaged 136 m (SE±55.1) from their point of initial capture. This is remarkable because these crabs are reported to move annually inland up to several kilometers for mating. Either some C. guanhumi do not move during mating season, or they return to the same location they left. The carapace size of captured C. guanhumi suggests hunting was not greatly pressuring populations at the time of this study. These findings may help natural resource managers implement a conservation plan that will allow sustainable harvest of this population.