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Nuptial gifts fail to resolve a sexual conflict in an insect
Simmons, Leigh W
University of Exeter
BMC Evolutionary Biology
Copyright © 2008 Wedell et al; licensee BioMed Central Ltd.
Background Because of the potential benefits to individuals of saving investment for future mating opportunities, there is conflict between mates over most aspects of reproduction. Males of many species transfer compounds in the ejaculate that manipulate female reproductive physiology to increase male reproductive success. These seminal compounds are often associated with direct and/or indirect costs to females. In contrast, in some species ejaculates also contain nutrients used by females for somatic maintenance and increased reproductive output. In general, the extent to which male seminal components are detrimental or beneficial to females is poorly understood, and interactions between seminal compounds with different effects have been almost completely neglected. Here we examine the impact of male receptivity-suppressing factors and nutrient donations on female longevity and lifetime reproductive output in the bushcricket Requena verticalis. Results We show that receiving multiple ejaculates reduces longevity in female R. verticalis, indicating a cost of male derived receptivity-suppressing compounds. Consumption of male nutrient donations does not appear to ameliorate this longevity cost, and there was no effect of nutrient provisioning on female lifetime fecundity. Conclusion These results indicate that nutrient provisioning does not provide a resolution to sexual conflict over female receptivity in this bushcricket species.
BMC Evolutionary Biology 2008 8:204
PubMed Central ID