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Reducing a Cost of Traumatic Insemination: Female Bedbugs Evolve a Unique Organ

Klaus Reinhardt, Richard Naylor and Michael T. Siva-Jothy
Proceedings: Biological Sciences
Vol. 270, No. 1531 (Nov. 22, 2003), pp. 2371-2375
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/3592164
Page Count: 5
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Reducing a Cost of Traumatic Insemination: Female Bedbugs Evolve a Unique Organ
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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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