Temporal variation of heterozygosity-based assortative mating and related benefits in a lesser kestrel population

Authors

  • J. ORTEGO,

    1. Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain
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  • G. CALABUIG,

    1. Grupo de Investigación de la Biodiversidad Genética y Cultural, Instituto de Investigación en Recursos Cinegéticos – IREC (CSIC, UCLM, JCCM), Ciudad Real, Spain
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  • R. BONAL,

    1. Grupo de Investigación de la Biodiversidad Genética y Cultural, Instituto de Investigación en Recursos Cinegéticos – IREC (CSIC, UCLM, JCCM), Ciudad Real, Spain
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  • A. MUÑOZ,

    1. Instituto de Recursos Naturales, Centro de Ciencias Medioambientales (CSIC), Madrid, Spain
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  • J. M. APARICIO,

    1. Grupo de Investigación de la Biodiversidad Genética y Cultural, Instituto de Investigación en Recursos Cinegéticos – IREC (CSIC, UCLM, JCCM), Ciudad Real, Spain
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  • P. J. CORDERO

    1. Grupo de Investigación de la Biodiversidad Genética y Cultural, Instituto de Investigación en Recursos Cinegéticos – IREC (CSIC, UCLM, JCCM), Ciudad Real, Spain
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Joaquín Ortego, Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales (CSIC), C/José Gutiérrez Abascal 2, E-28006 Madrid, Spain.
Tel.: +34 914 111 328; fax: +34 926 295 451; e-mail: joaquin.ortego@mncn.csic.es

Abstract

Heterozygosity as a target of mate choice has received much attention in recent years and there is growing evidence supporting its role in the evolution of mate preferences. In this study we analyse mating patterns in relation to heterozygosity in a lesser kestrel (Falco naumanni) population intensively monitored over six study years (2002–2007). The magnitude of heterozygosity-based assortative mating varied over time, being particularly patent in the last study years (2006, 2007). We have found evidence that this mating pattern entails both direct and indirect-genetic benefits. Clutch size increased with female heterozygosity and more heterozygous males raised a higher number of fledglings particularly in those years when the strength of the heterozygosity-based assortative mating was markedly higher. In the last study year, parent–offspring correlation of heterozygosity was stronger and higher than the expected if individuals would have randomly mated with respect to heterozygosity. Overall, our results offer empirical support to the heterozygous mate hypothesis of sexual selection but suggest that genetic diversity may act as a temporally variable target for mate choice.

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