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Complex Mhc-based mate choice in a wild passerine

Författare:
Publiceringsår: 2006
Språk: Engelska
Sidor: 1111-1116
Publikation/Tidskrift/Serie: Proceedings / Royal Society. Biological sciences
Volym: 273
Nummer: 1590
Dokumenttyp: Artikel
Förlag: The Royal Society

Sammanfattning

The extreme polymorphism of the vertebrate major histocompatibility complex (Mhc) is famous for protecting hosts against constantly evolving pathogens. Mate choice is often evoked as a means of maintaining Mhc variability through avoidance of partners with similar Mhc alleles or preference for heterozygotes. Evidence for these two hypotheses mostly comes from studies on humans and laboratory mice. Here, we tested these hypotheses in a wild outbred population of house sparrows (Passer domesticus). Females were not more or less closely related to the males they paired with when considering neutral genetic variation. However, males failed to form breeding pairs when they had too few Mhc alleles and when they were too dissimilar from females at Mhc loci (i.e. had no common alleles). Furthermore, pairs did not form at random as Mhc diversity positively correlated in mating pairs. These results suggest that mate choice evolves in response to (i) benefits in terms of parasite resistance acquired from allelic diversity, and (ii) costs associated with the disruption of co-adapted genes.

Disputation

Nyckelord

  • Biology and Life Sciences

Övrigt

Published
Yes
  • Molecular Ecology and Evolution Lab
  • ISSN: 1471-2954
  • ISSN: 0962-8452

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