Conservation Genetics

, Volume 8, Issue 4, pp 885–891 | Cite as

Low MHC DRB class II diversity in the mountain goat: past bottlenecks and possible role of pathogens and parasites

  • Julien MainguyEmail author
  • Kirsty Worley
  • Steeve D. Côté
  • David W. Coltman
Original Paper


Major histocompatibility complex (MHC) genes are the most polymorphic in vertebrates and code for molecules playing a central role in pathogen resistance. We studied levels of MHC DRB class II diversity in a long-term study population of mountain goats (Oreamnos americanus) at Caw Ridge, Alberta, and two other populations from British Columbia, Canada. Only two alleles were found among the three populations sampled. The Caw Ridge population was fixed for one of the two MHC DRB alleles, but this lack of variation did not appear to have affected it negatively because the population doubled over two decades and had no history of any apparent infectious diseases. Past population bottlenecks during Pleistocene glaciations are thought to have been the main factor contributing to the low levels of MHC diversity in mountain goats, a hypothesis supported by our previous work reporting low polymorphism at neutral loci. Additionally, the limited MHC variability in mountain goats may be related to its northern distribution as we found that allelic diversity at MHC DRB class II in wild ungulates decreases with increasing latitude, possibly as a result of low parasite diversity at high latitudes. The low MHC variation in mountain goats and other northern ungulates such as muskoxen (Ovibos moschatus) may expose these species to population outbreaks that could be generated by introduced pathogens or northward shifts in the distribution of pathogens with global climate warming.


Genetic drift Latitude Major histocompatibility complex (MHC) Pathogens and parasites Wild ungulates 



Many people helped with fieldwork at Caw Ridge over the years and we thank all of them. M Festa-Bianchet and KG Smith were instrumental in initiating the study at Caw Ridge. We thank H Schwantje for samples from British Columbia. We are also grateful to A Rus Hoelzel and three anonymous reviewers for comments that improved the quality of this manuscript. Funding was provided by the Natural Environment Research Council (UK), the Natural Sciences and Engineering Research Council (NSERC, Canada), the Alberta Natural Resources Service, the Rocky Mountain Goat Foundation, the Alberta Conservation Association (ACA), and Alberta Ingenuity. J Mainguy was supported by NSERC, Fonds Québécois de la Recherche sur la Nature et les Technologies, and ACA grants in biodiversity scholarships.


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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Julien Mainguy
    • 1
    Email author
  • Kirsty Worley
    • 2
  • Steeve D. Côté
    • 1
  • David W. Coltman
    • 3
  1. 1.Département de biologie and Centre d’études nordiquesUniversité LavalQuébecCanada
  2. 2.Department of Animal and Plant SciencesUniversity of SheffieldSheffieldUK
  3. 3.Department of Biological SciencesUniversity of AlbertaEdmontonCanada

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