Abstract
The subsocial tenebrionid Parastizopus armaticeps Pér. is parasitized by the closely related Eremostibes opacus Koch (Coleoptera: Tenebrionidae). We found that the pygidial defensive secretions of both species are similar and contain a mixture of 1,4-benzoquinones, 1-alkenes, and monoterpene hydrocarbons. The 1-alkenes are dominated by 1-undecene, with admixtures of 1-tridecene in both species and 1-pentadecene in P. armaticeps only. Methyl- and ethyl-1,4-benzoquinone are the major quinones of the secretions of both species. The monoterpene fractions consist of (−)-α-pinene, (−)-camphene, sabinene, (−)-β-pinene, and (−)-limonene. Volatiles trapped with Porapak Q at the entrance to the breeding burrows of P. armaticeps were identified as components of the defensive secretion. However, in contrast to the secretion, the 1,4-benzoquinones were almost completely absent in the volatiles. Bioassays investigating attraction showed that the cleptoparasite E. opacus was drawn to the monoterpene hydrocarbons, produced by P. armaticeps, and deterred by the 1,4-benzoquinones. The 1-alkenes had no effect. Among the monoterpenes, only (−)-camphene was attractive to E. opacus. This is one of the rare cases of chemical exploitation of defensive allomones, and the first based on odor homology. We have drawn an evolutionary scenario including various functional changes in the defensive secretion compounds, leading to the kairomonal exploitation.
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Acknowledgments
We are grateful to Thomas Schmitt for synthesis of isopropyl- and propyl-1,4-benzoquinone as reference standards and to Sonia Whitlow, Stefanie Geiselhardt, and two anonymous reviewers for helpful comments on the manuscript. This work was supported by the Deutsche Forschungsgemeinschaft, Bonn (Ra 338/5-4, Pe 231/13-1,2).
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Geiselhardt, S., Szepat, T., Rasa, O.A.E. et al. Defensive Secretion Components of the Host Parastizopus armaticeps as Kairomones for the Cleptoparasite Eremostibes opacus . J Chem Ecol 32, 767–778 (2006). https://doi.org/10.1007/s10886-006-9028-9
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DOI: https://doi.org/10.1007/s10886-006-9028-9