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Fecundity and MHC affects ejaculation tactics and paternity bias in sand lizards

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Olsson, M and Madsen, T and Ujvari, B and Wapstra, E (2004) Fecundity and MHC affects ejaculation tactics and paternity bias in sand lizards. Evolution, 58 (4). pp. 906-909. ISSN 0014-3820

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Abstract

We demonstrate that extending copulation enhances probability of paternity in sand lizards and that determinants of copulation duration depend on a males’ mating order (first or second). First males, with no information on presence of rivals, extend copulation when mating with a more fecund female. Second males, however, adjust copula duration in relation to a first male’s relatedness with his female, which there is reason to believe can be deduced from the MHC-related odor of the copulatory plug. Male-female relatedness negatively influences a male’s probability of paternity, and when second males are in a favored role (i.e., the first male is the one more closely related to the female), second males transfer larger ejaculates, resulting in higher probability of paternity. This result corroborates predictions from recent theoretical models on sperm expenditure theory incorporating cryptic female choice and sexual conflict. More specifically, the results conform to a ‘‘random roles’’ model, which depicts males as being favored by some females and disfavored by others, but not to a ‘‘constant-type’’ model, in which a male is either favored or disfavored uniformly by all females in a population.

Item Type: Article
Keywords: Fecundity, lizards, major histocompatibility complex, paternity bias, sperm competition
Journal or Publication Title: Evolution
Page Range: pp. 906-909
ISSN: 0014-3820
Identification Number - DOI: 10.1111/j.0014-3820.2004.tb00423.x
Additional Information: The definitive version is available at www.blackwell-synergy.com
Date Deposited: 16 Oct 2007 00:44
Last Modified: 18 Nov 2014 03:23
URI: http://eprints.utas.edu.au/id/eprint/2199
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