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AuthorsSusan Bergamin, Anne Smits
TitleHow do the molluscivorous beetles Carabus granulatus and Phosphuga atrata (Insecta, Coleoptera) deal with sinistral and dextral prey?
JournalVita Malacologica
KeywordsCarabidae; Silphidae; Lymnaea stagnalis; molluscivory; chirality; predation; behaviour; mouth parts
AbstractPredators of asymmetric prey (such as snails) are often
asymmetric themselves or display a predation behaviour that
is adapted to the asymmetry of their prey. We studied predation
of sinistral and dextral forms of the freshwater snail
Lymnaea stagnalis (Linnaeus, 1758) by two snail-feeding
beetle species, Phosphuga atrata (Linnaeus, 1758) and
Carabus granulatus Linnaeus, 1758. We investigated a possible
preference for or more efficient predation of prey items
with a certain coiling direction. We found that C. granulatus
displayed a preference for dextral snails, as opposed to P.
atrata, which did not show any preference. We also looked at
the asymmetry of the mandibles. In C. granulatus the left
mandible overlay the right one in a higher proportion of specimens
(93.7%) than in the non-molluscivorous carabid,
Calosoma inquisitor (Linnaeus, 1758) (86.7%), whereas these
differences were reversed in P. atrata and the non-molluscivorous
silphid Oiceoptoma thoracicum (Linnaeus, 1758)
(77.0% and 87.4%, respectively). We discuss our results in
the context of differences in feeding behaviour: C. granulatus
uses its mandibles to tear the body of the snail as it has withdrawn
itself in its shell, whereas P. atrata feeds by pre-digesting
the snail.
Document typearticle
Download paperpdf document http://www.repository.naturalis.nl/document/621882