Faculté des sciences

Physiological sources of variation in chemical defense of Oreina gloriosa (Coleoptera: Chrysomelidae)

Eggenberger, F. ; Rowell-Rahier, Martine

In: Journal of Chemical Ecology, 1993, vol. 19, no. 3, p. 395-410

The defensive secretion of the alpine chrysomelid Oreina gloriosa is a complex mixture of mainly cardenolides and tyrosine betaine. Individually sampled secretions of adult laboratory-reared and field-collected beetles were analyzed by reverse-phase HPLC; 16 secretion components were quantified. Quantities and concentrations of different components were significantly affected by the age,... Plus

Ajouter à la liste personnelle
    Summary
    The defensive secretion of the alpine chrysomelid Oreina gloriosa is a complex mixture of mainly cardenolides and tyrosine betaine. Individually sampled secretions of adult laboratory-reared and field-collected beetles were analyzed by reverse-phase HPLC; 16 secretion components were quantified. Quantities and concentrations of different components were significantly affected by the age, sex, and reproductive status of individual beetles. Aging was correlated with marked increases (up to 4.4-fold) and decreases (up to 2.7-fold) of quantities and concentrations of several components. Differences between the sexes were smaller, but quantities of all components and concentrations of several components were larger in laboratory-reared females than in males. There was less of one component of the secretion in mated than unmated females, but the concentrations of four secretion components were higher (up to 1.6-fold) in mated females.