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Do gulls benefit from the starfish autotomy response?

Published online by Cambridge University Press:  10 February 2010

I.C. Wilkie*
Affiliation:
Department of Biological and Biomedical Sciences, Glasgow Caledonian University, Glasgow, Scotland, G4 0BA
*
Correspondence should be addressed to: I.C. Wilkie, Department of Biological and Biomedical Sciences, Glasgow Caledonian University, Glasgow, Scotland, G4 0BA email: i.wilkie@gcal.ac.uk
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Abstract

Certain starfish have a restricted autotomy region at the base of each arm, at which the whole arm is detached if damaged or trapped. These species are common prey items of gulls, which have been observed to break-up starfish by gripping one arm and shaking the whole animal. This raises the possibility that shaking invokes the autotomy response, thereby accelerating consumption of prey and reducing the opportunity for prey to be stolen. To evaluate the role of autotomy in this interaction, specimens of Asterias rubens were shaken manually and the timing and pattern of breakage recorded. It was found that arm detachment was usually mediated by autotomy, although this depended on the way in which animals were shaken, and that autotomy did not effect detachment more rapidly than breakage outwith the autotomy region.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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