Sperm competition games: a prospective analysis of risk assessment

Proceedings. Biological Sciences
G A ParkerM J Gage

Abstract

We develop the logic of assessment of sperm competition risk by individual males where the mechanism of sperm competition follows a 'loaded raffle' (first and second inseminates of a female have unequal prospects). Male roles (first or second to mate) are determined randomly. In model 1, males have no information about the risk associated with individual females and ejaculation strategy depends only on the probability, q, that females mate twice. Evolutionarily stable strategy (ESS) ejaculate expenditure increases linearly from zero with q, and reduces with increasing inequality between ejaculates, though the direction of the loading (which role is favoured) is unimportant. In model 2, males have perfect information and can identify each of three risk states: females that will (1) mate just once ('no risk'), (2) mate twice but have not yet mated ('future risk'), and (3) mate twice and have already mated ('past risk'). The ESS is to ejaculate minimally with 'no risk' females, and to expand equally with 'past' and 'future' risk females; the direction of the competitive loading is again unimportant. Expenditure again increases with risk, but is now non-zero at extremely low risk. Model 3 examines three cases of partial information...Continue Reading

References

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Citations

Aug 6, 2003·Journal of Theoretical Biology·M A Ball, G A Parker
Mar 1, 1998·Trends in Ecology & Evolution·D J Hosken, P Stockley
Sep 24, 2004·Nature·Javier Delbarco-Trillo, Michael H Ferkin
Sep 2, 2008·Proceedings of the National Academy of Sciences of the United States of America·Angela J Crean, Dustin J Marshall
Dec 7, 2006·Biology Letters·Sarah J Kilgallon, Leigh W Simmons
Apr 16, 2010·Biology Letters·Kensuke OkadaTakahisa Miyatake
Jun 30, 2000·Proceedings. Biological Sciences·G A Parker
Sep 28, 2000·Proceedings. Biological Sciences·J L Tomkins, L W Simmons
Sep 18, 2002·Proceedings. Biological Sciences·J M Greeff, G A Parker
Oct 16, 2001·Proceedings. Biological Sciences·J M GreeffS G Compton
Aug 20, 2002·Proceedings. Biological Sciences·Ulrika Candolin, John D Reynolds
Dec 24, 2002·Proceedings. Biological Sciences·Matthew J G GageChrister Wiklund
Feb 8, 2005·Proceedings. Biological Sciences·Aurelio F MaloMontserrat Gomendio
Jul 19, 2005·Proceedings. Biological Sciences·Steven A RammPaula Stockley
Dec 7, 2006·Proceedings. Biological Sciences·Leif Engqvist, Klaus Reinhold
Oct 16, 2008·Proceedings. Biological Sciences·Melissa L Thomas, Leigh W Simmons
Nov 7, 2008·Proceedings. Biological Sciences·Steven A Ramm, Paula Stockley
Oct 1, 2010·Proceedings. Biological Sciences·Jean-François LemaîtrePaula Stockley
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Mar 23, 2012·Proceedings. Biological Sciences·Amanda BretmanTracey Chapman
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Sep 18, 2012·Reproduction : the Official Journal of the Society for the Study of Fertility·Leigh W Simmons, John L Fitzpatrick

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