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Heterozygosity-fitness correlations in a wild mammal population: accounting for parental and environmental effects

Annavi, Geetha and Newman, Christopher and Buesching, Christina D. and Macdonald, David W. and Burke, Terry and Dugdale, Hannah L. (2014) Heterozygosity-fitness correlations in a wild mammal population: accounting for parental and environmental effects. Ecology and Evolution, 4 (12). pp. 2594-2609. ISSN 2045-7758

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HFCs (heterozygosity–fitness correlations) measure the direct relationship between an individual's genetic diversity and fitness. The effects of parental heterozygosity and the environment on HFCs are currently under-researched. We investigated these in a high-density U.K. population of European badgers (Meles meles), using a multimodel capture–mark–recapture framework and 35 microsatellite loci. We detected interannual variation in first-year, but not adult, survival probability. Adult females had higher annual survival probabilities than adult males. Cubs with more heterozygous fathers had higher first-year survival, but only in wetter summers; there was no relationship with individual or maternal heterozygosity. Moist soil conditions enhance badger food supply (earthworms), improving survival. In dryer years, higher indiscriminate mortality rates appear to mask differential heterozygosity-related survival effects. This paternal interaction was significant in the most supported model; however, the model-averaged estimate had a relative importance of 0.50 and overlapped zero slightly. First-year survival probabilities were not correlated with the inbreeding coefficient (f); however, small sample sizes limited the power to detect inbreeding depression. Correlations between individual heterozygosity and inbreeding were weak, in line with published meta-analyses showing that HFCs tend to be weak. We found support for general rather than local heterozygosity effects on first-year survival probability, and g2 indicated that our markers had power to detect inbreeding. We emphasize the importance of assessing how environmental stressors can influence the magnitude and direction of HFCs and of considering how parental genetic diversity can affect fitness-related traits, which could play an important role in the evolution of mate choice.

Item Type:Article
Keyword:Capture–mark–recapture survival analysis; European badger; Heterozygosity–fitness correlations; Inbreeding depression; Meles meles; Paternal effects
Faculty or Institute:Faculty of Science
Publisher:John Wiley & Sons
DOI Number:10.1002/ece3.1112
ID Code:37854
Deposited By: Nabilah Mustapa
Deposited On:21 Apr 2016 12:23
Last Modified:21 Apr 2016 12:23

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