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Defensive Secretions of the Carabid Beetle Chlaenius cordicollis: Chemical Components and their Geographic Patterns of Variation

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Abstract

The defensive secretion of the ground beetle Chlaenius cordicollis is predominantly 3-methylphenol. Adult C. cordicollis were collected in Pennsylvania and Manitoba and induced to discharge defensive secretion in a vial. The headspace was sampled by solid phase microextraction, and samples were analyzed by gas chromatography–mass spectrometry. Five alkylphenolic compounds were detected: all beetles secreted 3-methlyphenol, 2,5-dimethylphenol, and 3-ethylphenol, and most beetles from each locality secreted detectable amounts of 2,3-dimethlyphenol and 3,4-dimethylphenol. In about 80% of beetles, we detected small amounts of the alkoxyphenolic compounds 2-methoxy-4-methylphenol and 2-methoxy-5-methylphenol. Multivariate compositional analysis of relative peak areas of alkylphenolic compounds revealed geographic variation and sexual dimorphism in defensive secretions. Compared with samples from Manitoba, relative peak areas of samples from Pennsylvania were lower for 2,3-dimethylphenol and higher for 3-methylphenol. Sexual dimorphism was detected only in Manitoba where, compared with samples from males, relative peak areas for samples from females were higher for 2,5-dimethylphenol and lower for 3-ethylphenol. This is the first report of geographic variation in defensive secretions of carabid beetles, and it demonstrates the need for knowledge of patterns of variation before characterizing the defensive secretions of a species as a whole.

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Acknowledgements

We thank L.J. Donald for technical assistance and Swarthmore College for funding.

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Correspondence to A. E. Holliday.

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Holliday, A.E., Holliday, N.J., Mattingly, T.M. et al. Defensive Secretions of the Carabid Beetle Chlaenius cordicollis: Chemical Components and their Geographic Patterns of Variation. J Chem Ecol 38, 278–286 (2012). https://doi.org/10.1007/s10886-012-0078-x

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