Sexual conflict over remating interval is modulated by the sex peptide pathway

Smith, Damian T., Clarke, Naomi V. E., Boone, James M., Fricke, Claudia and Chapman, Tracey (2017) Sexual conflict over remating interval is modulated by the sex peptide pathway. Proceedings of the Royal Society B, 284. ISSN 1471-2954

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Abstract

Sexual conflict, in which the evolutionary interests of males and females diverge, shapes the evolution of reproductive systems across diverse taxa. Here we used the fruit fly to study sexual conflict in natural, three-way interactions comprising a female, her current and previous mates. We manipulated the potential for sexual conflict by using sex peptide receptor (SPR) null females and by varying remating from 3 to 48h, a period during which natural rematings frequently occur. SPR-lacking females do not respond to sex peptide transferred during mating and maintain virgin levels of high receptivity and low fecundity. In the absence of SPR there was a convergence of fitness interests, with all individuals gaining highest productivity at 5h remating. This suggests that the expression of sexual conflict was reduced. We observed an unexpected second male-specific advantage to early remating, resulting from an increase in the efficiency of second male sperm use. This early window of opportunity for exploitation by second males depended on the presence of SPR. The results suggest that the sex peptide pathway can modulate the expression of sexual conflict in this system, and show how variation in the selective forces that shape conflict and co-operation can be maintained.

Item Type: Article
Uncontrolled Keywords: sexual conflict,sexual selection,drosophila melanogaster,sperm competition
Faculty \ School: Faculty of Science > School of Biological Sciences
Depositing User: Pure Connector
Date Deposited: 03 Mar 2017 01:41
Last Modified: 22 Jul 2020 01:23
URI: https://ueaeprints.uea.ac.uk/id/eprint/62837
DOI: 10.1098/rspb.2016.2394

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