Maturational costs of reproduction due to clutch size and ontogenetic conflict as revealed in the invisible fraction.

Proceedings. Biological Sciences
Barry Sinervo, Andrew G McAdam

Abstract

Reproduction is thought to entail costs, but assessing survival costs associated with maturation as organisms express reproductive genes for the first time is problematic because many will die prior to expressing a phenotype. We quantified selection acting on this invisible fraction by measuring selection on predicted breeding values for clutch size estimated from a multigenerational pedigree of side-blotched lizards in which clutch size was heritable (h2=0.25+/-0.04). The survival effects of predicted breeding values for clutch size during maturation, however, differed between males and females indicating ontogenetic conflict. Increased mortality during maturation was associated with lower predicted breeding values for clutch size for females, but higher predicted breeding values for males who do not produce a clutch. Genetic correlations between clutch size and male and female survival were consistent with calculated selection differentials. Experimental yolk removal did not affect progeny survival during maturation, indicating that selection on maturing progeny was not due to confounding yolk-volume maternal effects, and hormone manipulations confirmed clutch size as the target of viability selection during maturation. Such ...Continue Reading

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Citations

Jan 24, 2008·Proceedings. Biological Sciences·L E B Kruuk, W G Hill
May 14, 2010·Proceedings. Biological Sciences·Julius P Mojica, John K Kelly
Oct 9, 2014·Journal of Evolutionary Biology·R W TaylorA G McAdam
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Jul 25, 2009·Evolution; International Journal of Organic Evolution·Erik I SvenssonBarry Sinervo
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Oct 17, 2017·Journal of Evolutionary Biology·K E Brown, J K Kelly
Jun 3, 2021·Evolution; International Journal of Organic Evolution·Jill T AndersonMonica A Geber

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