Abstract
In soft sediment marine communities, fishes frequently bite off extended siphons of buried clams; the consequential shortening of the siphon is known to reduce burial depth of the clams, secondarily increasing their vulnerability to lethal excavating predators. In this study, siphon nipping on the yellow clam, Mesodesma mactroides, was simulated by removing the top 6.6–30% of siphons. This caused a burrow reduction in 25–75%, respectively, compared to control individuals with intact siphons, in field and laboratory trials. To examine subsequent consequences of reduced burial depth, we exposed nipped and intact clams to potential predators in the laboratory simulating the observed natural clam abundance. Artificially nipped clams were consumed twice as much as control clams. The present results suggest that sympatric croppers contribute to the stock recovery failure by facilitation of lethal predation and that re-seeding to increase the local abundance of M. mactroides should be an essential aspect of conservation efforts in South America.
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Acknowledgments
The present work was partially supported with funding of Sophie Danforth Conservation Biology Fund, project EXA 453/09 of Universidad Nacional de Mar del Plata, project PICT 2007-01398 of Agencia Nacional de Promoción Científica y Tecnológica and a fellowship of the Hanse Wissenschaftskolleg. We would like to thank P. E. Penchaszadeh and R. Bastida for their invaluable comments during the realisation of the experiments. We are specially grateful to Julia Sigwart of Queen’s University Belfast for English corrections and three anonymous reviewers for accurate and helpful comments.
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Communicated by S. D. Connell.
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Cledón, M., Nuñez, J.D. Siphon nipping facilitates lethal predation in the clam Mesodesma mactroides (Reeve, 1854) (Mollusca: Bivalva). Mar Biol 157, 737–745 (2010). https://doi.org/10.1007/s00227-009-1357-0
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DOI: https://doi.org/10.1007/s00227-009-1357-0