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Mate choice, male condition-dependent ornamentation and MHC in the pheasant

In English

Författare

Summary, in English

The Hamilton and Zuk model predicts that genes for resistance to various pathogens may be continuously heritable due to selection disequilibria caused by coadaptional cycles of hosts and pathogens. The model further suggests that the expression of male secondary ornaments is condition-dependent and that only individuals with superior genetic disease resistance and vigour can fully express exaggerated secondary ornaments. Female choice is therefore expected to discriminate among males on the basis of secondary sexual characters in order to pass on genes for disease resistance that improve fitness in the offspring. In wild ring-necked pheasants, Phasianus colchicus, of the Revinge area in southern Sweden, females prefer to mate with long-spurred males and data on reproductive success indicate that they may improve their chicks' survival rate by doing so. Male spur length is positively correlated with age, body size and viability. MHC genotyping for both class I and class II B of pheasant males trapped in the study area identified eight MHC haplotypes and a total of 17 different MHC genotypes. Multivariate analyses revealed that MHC genotype is significantly associated with variation in both male spur length and male viability. These data indicate that polymorphic genes with a central role in immune recognition can be associated with viability and the expression of a condition-dependent intersexually selected male trait, thus supporting essential parts of the Hamilton and Zuk model.

Publiceringsår

1997

Språk

Engelska

Sidor

133-140

Publikation/Tidskrift/Serie

Hereditas

Volym

127

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Genetics

Nyckelord

  • great reed warbler
  • b-complex
  • major histocompatibility complex
  • red jungle fowl
  • class-ii genes
  • phasianus-colchicus
  • mating
  • sexual selection
  • female choice
  • preferences
  • evolution

Status

Published

Projekt

  • Avian MHC genes

Forskningsgrupp

  • Molecular Ecology and Evolution Lab

ISBN/ISSN/Övrigt

  • ISSN: 1601-5223