Plasticity of shell preference and its antipredatory advantages in the hermit crab Calcinus californiensis
Abstract:The preference of the hermit crab Calcinus californiensis Bouvier, 1898 among six shell species and different shell sizes was evaluated in the presence of the swimming crab Arenaeus mexicanus (Gerstaecker, 1856), a natural predator of this species. In a second experiment, the survival benefit of the shell choice made under predation threat was examined by exposing hermit crabs occupying three different shell species (including the most and least preferred shells of two fits) to a free swimming crab predator. The preference for shell species was similar in the absence and presence of the predator threat, although the hermit crabs choose larger shells (loose) when exposed to the predator compared with the ones chosen in its absence. The predatory experiment showed a higher survival chance for the hermit crabs occupying loose shells of the preferred shell species (Cantharus sanguinolentus (Duclos, 1833)). The results of this study show that the hermit crab C. californiensis is able to change their preference for shell size in response to a predation threat and that the change in preference confers survival benefits for hermit crabs. This study is consistent with the assumption that predation is an important selective pressure for intertidal hermit crabs.
Keywords: Arenaeus mexicanus; Calcinus californiensis; adaptive benefits; avantages d’adaptation; bernard l’ermite; crabe de sable; hermit crabs; menace de prédation; predation threat; préférence en matière de coquille; shell preference; swimming crab
Document Type: Research Article
Affiliations: 1: Programa de Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, México City 04360, Mexico. 2: Laboratorio de Ecofisiología, Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México, México City 04510, Mexico.
Publication date: January 1, 2013
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