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Soay rams target reproductive activity towards promisculous females' optimal insemination period.

Preston, B. T. and Stevenson, I. R. and Wilson, Kenneth (2003) Soay rams target reproductive activity towards promisculous females' optimal insemination period. Proceedings of the Royal Society B: Biological Sciences, 270 (1528). pp. 2073-2078. ISSN 0962-8452

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Abstract

Female promiscuity is thought to have resulted in the evolution of male behaviours that confer advantages in the sperm competition that ensues. In mammalian species, males can gain a post-copulatory advantage in this sperm 'raffle' by inseminating females at the optimal time relative to ovulation, leading to the prediction that males should preferentially associate and copulate with females at these times. To the best of our knowledge, we provide the first high-resolution test of this prediction using feral Soay sheep, which have a mating system characterized by male competition for access to highly promiscuous females. We find that competitive males time their mate guarding (and hence copulations) to occur close to the optimal insemination period (OIP), when females are also increasingly likely to 'cooperate' with copulation attempts. Subordinate males practice an alternative mating tactic, where they break the integrity of the consort pair and force copulations on females. The timing of these forced copulations is also targeted towards the OIP. We thus provide quantitative evidence that female promiscuity has resulted in the evolution of reproductive strategies in which males 'load' the sperm raffle by targeting their mating activity towards female OIPs, when the probability of sperm-competition success is at its greatest.

Item Type: Article
Journal or Publication Title: Proceedings of the Royal Society B: Biological Sciences
Uncontrolled Keywords: Sperm Competition ; Promiscuity ; Mate Guarding ; Alternative Mating Tactic ; Soay Sheep
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 8997
Deposited By: Dr Kenneth Wilson
Deposited On: 20 May 2008 15:57
Refereed?: Yes
Published?: Published
Last Modified: 31 Oct 2014 14:23
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/8997

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