Landscape-scale variation in an anthropogenic factor shapes immune gene variation within a wild population

Catalina Gonzalez-Quevedo, Richard G. Davies, Karl P. Phillips, Lewis G. Spurgin, David S. Richardson (Lead Author)

Research output: Contribution to journalArticle

12 Citations (Scopus)
7 Downloads (Pure)

Abstract

Understanding the spatial scale at which selection acts upon adaptive genetic variation in natural populations is fundamental to our understanding of evolutionary ecology, and has important ramifications for conservation. The environmental factors to which individuals of a population are exposed can vary at fine spatial scales, potentially generating localized patterns of adaptation. Here, we compared patterns of neutral and major histocompatibility complex (MHC) variation within an island population of Berthelot's pipit (Anthus berthelotii) to assess whether landscape-level differences in pathogen-mediated selection generate fine-scale spatial structuring in these immune genes. Specifically, we tested for spatial associations between the distribution of avian malaria, and the factors previously shown to influence that distribution, and MHC variation within resident individuals. Although we found no overall genetic structure across the population for either neutral or MHC loci, we did find localized associations between environmental factors and MHC variation. One MHC class I allele (ANBE48) was directly associated with malaria infection risk, while the presence of the ANBE48 and ANBE38 alleles within individuals correlated (positively and negatively, respectively) with distance to the nearest poultry farm, an anthropogenic factor previously shown to be an important determinant of disease distribution in the study population. Our findings highlight the importance of considering small spatial scales when studying the patterns and processes involved in evolution at adaptive loci.
Original languageEnglish
Pages (from-to)4234–4246
Number of pages13
JournalMolecular Ecology
Volume25
Issue number17
Early online date10 Aug 2016
DOIs
Publication statusPublished - Sep 2016

Keywords

  • malaria
  • PCNM
  • Berthelot’s pipit
  • major histocompatibility complex
  • MHC

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