Conservation Genetics

, Volume 11, Issue 6, pp 2333–2342

MHC-mediated local adaptation in reciprocally translocated Chinook salmon

  • Melissa L. Evans
  • Bryan D. Neff
  • Daniel D. Heath
Research Article

Abstract

Most Pacific salmonid populations have faced significant population declines over the past 30 years. In order to effectively conserve and manage these populations, knowledge of the evolutionary adaptive state of individuals and the scale of adaptation across populations is needed. The vertebrate major histocompatibility complex (MHC) represents an important adaptation to parasites, and genes encoding for the MHC are widely held to be undergoing balancing selection. However, the generality of balancing selection across populations at MHC loci is not well documented. Using Chinook salmon (Oncorhynchus tshawytscha) from two populations, we follow the survival of full-sib family replicates reared in their natal river and reciprocally transplanted to a foreign river to examine selection and local adaptation at the MHC class I and II loci. In both populations, we found evidence of a survivorship advantage associated with nucleotide diversity at the MHC class I locus. In contrast, we found evidence that MHC class II diversity was disadvantageous in one population. There was no evidence that these effects occurred in translocated families, suggesting some degree of local adaptation at the MHC loci. Thus, our results implicate balancing selection at the MHC class I but potentially differing selection across populations at the class II locus.

Keywords

Major histocompatibility complex Chinook salmon Adaptive divergence Nucleotide divergence Balancing selection Directional selection Survival 

Supplementary material

10592_2010_119_MOESM1_ESM.docx (585 kb)
Supplementary material 1 (DOCX 584 kb)

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Melissa L. Evans
    • 1
    • 2
  • Bryan D. Neff
    • 1
  • Daniel D. Heath
    • 3
  1. 1.Department of BiologyUniversity of Western OntarioLondonCanada
  2. 2.Institut de Biologie Intégrative et des Systèmes, Pavillon Charles-Eugène-MarchandUniversité LavalQuebecCanada
  3. 3.Great Lakes Institute for Environmental Research and the Department of Biological SciencesUniversity of WindsorWindsorCanada

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