Abstract
The frequent wounding of female bedbugs (Cimex lectularius: Cimicidae) during copulation has been shown to decrease their fitness, but how females have responded to this cost in evolutionary terms is unclear. The evolution of a unique anatomical structure found in female bedbugs, the spermalege, into which the male's intromittent organ passes during traumatic insemination, is a possible counteradaptation to harmful male traits. Several functions have been proposed for this organ, and we test two hypotheses related to its role in sexual conflict. We examine the hypotheses that the spermalege functions to (i) defend against pathogens introduced during traumatic insemination; and (ii) reduce the costs of wound healing during traumatic insemination. Our results support the 'defence against pathogens' hypothesis, suggesting that the evolution of this unique cimicid organ resulted, at least partly, from selection to reduce the costs of mating-associated infection. We found no evidence that the spermalege reduces the costs of wound healing.
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Selected References
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- Arnqvist Göran, Rowe Locke. Antagonistic coevolution between the sexes in a group of insects. Nature. 2002 Feb 14;415(6873):787–789. doi: 10.1038/415787a. [DOI] [PubMed] [Google Scholar]
- Cordero C., Eberhard W. G. Female choice of sexually antagonistic male adaptations: a critical review of some current research. J Evol Biol. 2003 Jan;16(1):1–6. doi: 10.1046/j.1420-9101.2003.00506.x. [DOI] [PubMed] [Google Scholar]
- Crudgington H. S., Siva-Jothy M. T. Genital damage, kicking and early death. Nature. 2000 Oct 19;407(6806):855–856. doi: 10.1038/35038154. [DOI] [PubMed] [Google Scholar]
- Davis N. T. Studies of the reproductive physiology of Cimicidae (Hemiptera). 3. The seminal stimulus. J Insect Physiol. 1965 Sep;11(9):1199–1211. doi: 10.1016/0022-1910(65)90112-5. [DOI] [PubMed] [Google Scholar]
- Kokko Hanna, Brooks Robert, Jennions Michael D., Morley Josephine. The evolution of mate choice and mating biases. Proc Biol Sci. 2003 Mar 22;270(1515):653–664. doi: 10.1098/rspb.2002.2235. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Siva-Jothy Michael T., Stutt Alistair D. A matter of taste: direct detection of female mating status in the bedbug. Proc Biol Sci. 2003 Mar 22;270(1515):649–652. doi: 10.1098/rspb.2002.2260. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Stutt A. D., Siva-Jothy M. T. Traumatic insemination and sexual conflict in the bed bug Cimex lectularius. Proc Natl Acad Sci U S A. 2001 May 1;98(10):5683–5687. doi: 10.1073/pnas.101440698. [DOI] [PMC free article] [PubMed] [Google Scholar]