Abstract
Using the drilling muricid, Nucella lamellosa (Gmelin 1791) and its prey, the mussel Mytilus trossulus (Gould 1850), the impact of a secondary predator, the crab Cancer gracilis, on drilling was investigated experimentally. The frequency of incomplete holes was compared under two conditions: (1) when the gastropod's natural predator, C. gracilis, was present and (2) when it was absent. The results indicate that the presence of a secondary predator can affect drilling activity, leading to a significant increase in the frequency of incomplete drill holes. The introduction of a secondary predator can also decrease the overall drilling frequency. The size distributions of completely and incompletely drilled mussels suggest that in the presence of the secondary predator the decision by the gastropod to either abandon or continue drilling its prey might be influenced by how much time it has already invested into drilling or the size of the prey item. These results are important for the ecological and evolutionary implications of incomplete drill holes frequencies, especially with regard for their use as proxies for evolutionary prey improvement.
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