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Sexual dimorphism in the lipid fraction of the defensive secretion ofGastrophysa viridula (Coleoptera: Chrysomelidae) |
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| Authors: | F Eggenberger S Heilporn D Daloze J M Pasteels |
| Institution: | (1) Laboratoire de Chimie Bio-organique, Faculté des Sciences, Université Libre de Bruxelles, Av. F.D. Roosevelt 50, B-1050 Bruxelles, (Belgium);(2) Laboratoire de Biologie Animale et Cellulaire, Faculté des Sciences, Université Libre de Bruxelles, Av. F.D. Roosevelt 50, B-1050 Bruxelles, (Belgium);(3) Biocomputing, Biozentrum der Universität Basel, Klingelbergstrasse 70, CH-4056 Basel, (Switzerland) |
| Abstract: | The lipid fraction of the defensive secretion of adultGastrophysa viridula was analyzed by gas-liquid chromatography and gas chromatography-mass spectrometry. Three long chain acetates and two methyl-branched hydrocarbons were identified and their amounts in the secretion of single field-collected and laboratory-reared beetles determined. The composition of the secretion was affected by the sex, reproductive status, and age of the beetle. The ratio of (Z)-11-eicosenyl acetate to (Z)-13-docosenyl acetate ranged from 0.30 to 0.78 in male beetles and from 1.05 to 2.06 in female beetles. The biological significance of this sexual dimorphism is discussed. |
| Keywords: | Gastrophysa viridula Chrysomelidae Coleoptera chemical defence acetates hydrocarbons gas-liquid chromatography gas chromatography-mass spectrometry sexual dimorphism |
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