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Predation by the sea urchin Strongylocentrotus droebachiensis on capsular egg masses of the whelk Buccinum undatum

Published online by Cambridge University Press:  24 June 2008

Clement P. Dumont*
Affiliation:
Département de Biologie and Québec-Océan, Université Laval, Québec GIK7P4, Canada Hopkins Marine Station, Stanford University, Oceanview Boulevard, Pacific Grove, CA 93950-3094, USA
Jean-Sebastien Roy
Affiliation:
Département de Biologie and Québec-Océan, Université Laval, Québec GIK7P4, Canada
John H. Himmelman
Affiliation:
Département de Biologie and Québec-Océan, Université Laval, Québec GIK7P4, Canada
*
Correspondence should be addressed to: Clement P. Dumont Département de Biologie and Québec-OcéanUniversité Laval, Québec GIK7P4, Canada email: cdumont@stanford.edu

Abstract

We evaluated sea urchin Strongylocentrotus droebachiensis predation on egg masses of the whelk Buccinum undatum. The urchin actively grazes on the egg masses, even as they are being deposited on the bottom. Whelks preferentially lay their egg masses on vertical areas where urchin densities are 4-fold less than on flat areas. This strategy is advantageous, as experimental trials showed that the loss in the mass of capsules was 4 fewer on walls than on flat areas. Nevertheless, a high proportion of egg masses on walls show damage from predation. Urchins provided with egg masses in the laboratory, ingested the capsules at a steady rate over a 9-d period (5 urchins ingested 2.8 g.d-1). Urchins provided agar discs that included a preferred alga and whelk capsule walls ingested the discs at a rate that was half that observed for discs that only included the alga. Discs that included the preferred alga and capsule contents were eaten at the same rate as discs that only included the alga. Thus, capsule walls, but not the capsule contents, provide a defence against urchin predation. Laying aggregate egg masses likely provides only a limited advantage, as the attachment surface does not increase with the number of egg masses deposited together, so the risk of detachment increases. Consideration of the interactions between urchins and whelks is important in managing the fisheries of the two species.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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