Evolutionary Ecology

, Volume 22, Issue 5, pp 617–636

MHC-associated mating strategies and the importance of overall genetic diversity in an obligate pair-living primate

Authors

  • Nina Schwensow
    • Animal Ecology & ConservationUniversity of Hamburg
    • Leibniz-Institute for Zoo- and Wildlife Research (IZW)
  • Joanna Fietz
    • Experimental EcologyUniversity of Ulm
  • Kathrin Dausmann
    • Animal Ecology & ConservationUniversity of Hamburg
    • Animal Ecology & ConservationUniversity of Hamburg
    • Leibniz-Institute for Zoo- and Wildlife Research (IZW)
Original Paper

DOI: 10.1007/s10682-007-9186-4

Cite this article as:
Schwensow, N., Fietz, J., Dausmann, K. et al. Evol Ecol (2008) 22: 617. doi:10.1007/s10682-007-9186-4

Abstract

Mate choice is one of the most important evolutionary mechanisms. Females can improve their fitness by selectively mating with certain males. We studied possible genetic benefits in the obligate pair-living fat-tailed dwarf lemur (Cheirogaleus medius) which maintains life-long pair bonds but has an extremely high rate of extra-pair paternity. Possible mechanisms of female mate choice were investigated by analyzing overall genetic variability (neutral microsatellite marker) as well as a marker of adaptive significance (major histocompatibility complex, MHC-DRB exon 2). As in human medical studies, MHC-alleles were grouped to MHC-supertypes based on similarities in their functional important antigen binding sites. The study indicated that females preferred males both as social and as genetic fathers for their offspring having a higher number of MHC-alleles and MHC-supertypes, a lower overlap with female’s MHC-supertypes as well as a higher genome wide heterozygosity than randomly assigned males. Mutual relatedness had no influence on mate choice. Females engaged in extra-pair mating shared a significant higher number of MHC-supertypes with their social partner than faithful females. As no genetic differences between extra-pair young (EPY) and intra-pair young (IPY) were found, females might engage in extra-pair mating to ‘correct’ for genetic incompatibility. Thus, we found evidence that mate choice is predicted in the first place by the ‘good-genes-as-heterozygosity hypothesis’ whereas the occurrence of extra-pair matings supports the ‘dissassortative mating hypothesis’. To the best of our knowledge this study represents the first investigation of the potential roles of MHC-genes and overall genetic diversity in mate choice and extra-pair partner selection in a natural, free-living population of non-human primates.

Keywords

Mate choiceMHC class IIMicrosatellitesPair-living lemurExtra-pair partnerCheirogaleus mediusMadagascar

Copyright information

© Springer Science+Business Media B.V. 2007