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Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

SOTO, RUBÉN E.; CASTILLA, JUAN C.  and  BOZINOVIC, FRANCISCO. Foraging behavior of the gastropod Acanthina monodon Pallas, 1774  (Gastropoda: Muricidae) in the intertidal rocky shores of central Chile. Rev. chil. hist. nat. [online]. 2004, vol.77, n.1, pp.157-175. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2004000100012.

We investigated the ecology and foraging behavior of Acanthina monodon, a muricid gastropod that inhabits in the intertidal rocky shores of central Chile. In the field, we studied temporal variation of their spatial distribution, density, and diet composition. While in the laboratory, we quantified the consumption rate, alimentary preferences, ingestion times and energy profitability obtained with different types of prey using experiments and video recording. High densities of A. monodon individuals were observed in the intertidal fringe near at the level tide zero. In the field, A. monodon actively foraged at night preying mainly on mussels (95 %) and barnacles (5 %). Temporal variation in diet composition of A. monodon was caused mostly by changes in the cover of different mussel species during the two years of sampling. In the laboratory, individual of A. monodon showed significant preference for the mussel Semimytilus algosus. In these experiments, A. monodon's foraging behavior maximized the net gain of energy by selecting species and sizes of prey that provided the greatest energy profitability

Keywords : gastropod; intertidal; central Chile; foraging; prey selection.

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