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The utility of wax replicas as a measure of crab attack frequency in the rocky intertidal

Published online by Cambridge University Press:  09 September 2014

Carrie L. Tyler*
Florida Museum of Natural History, Museum Road, PO Box 117800, Gainesville, FL 32611-7800, USA
E.S. Stafford
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6E 4J5, Canada
L.R. Leighton
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6E 4J5, Canada
Correspondence should be addressed to: C.L. Tyler, Florida Museum of Natural History, Museum Road, PO Box 117800, Gainesville, FL 32611-7800, USA email:


Crabs are thought to play a vital role in structuring gastropod populations. Studies quantifying the frequencies with which crabs attack gastropods in natural settings are, however, scarce. Although a wide variety of techniques exist with which predator–prey interactions can be investigated (e.g. laboratory experiments, exclusion caging, tethering and population surveys), there is a need for methods that can provide large amounts of quantitative data, particularly documenting the frequency with which crabs attack gastropods. This study examines the utility of using wax replicas of gastropods to determine crab attack frequencies. Replicas of Chlorostoma funebralis, Nucella ostrina and Nucella lamellosa were bolted to mesh screens and deployed in the rocky intertidal. Crabs attacked wax replicas of gastropods, leaving characteristic marks in the wax. In most cases, the appendage used in the attack could be identified from the marks (i.e. chelae vs walking legs). The effectiveness of this technique was verified using surveys of repair scar frequencies of the gastropod populations; patterns in attack frequency, determined from the number of marked wax replicas, were consistent with those of repair frequency, in that both were greater at the wave protected, quiet water locality. This study confirms the value of wax replicas in investigations of crab predation to determine the frequency and type of attack, and illustrates the potential of this method for quantifying predation intensity. The development of techniques that quantify the magnitude and exact nature of the effects of crab predation on intertidal communities is pivotal, given the intensity of commercial fishing of some species of crabs.

Research Article
Copyright © Marine Biological Association of the United Kingdom 2014 

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