Genetic characterization of Common Eiders breeding in the Yukon-Kuskokwim Delta, Alaska

Sarah A. Sonsthagen, Sandy L. Talbot, Kevin G. McCracken

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

We assessed population genetic subdivision among four colonies of Common Eiders (Somateria mollissima v-nigrum) breeding in the Yukon-Kuskokwim Delta (YKD), Alaska, using microsatellite genotypes and DNA sequences with differing modes of inheritance. Significant, albeit low, levels of genetic differentiation were observed between mainland populations and Kigigak Island for nuclear intron lamin A and mitochondrial DNA (mtDNA) control region. Intercolony variation in haplotypic frequencies also was observed at mtDNA. Positive growth signatures assayed from microsatellites, nuclear introns, and mtDNA indicate recent colonization of the YKD, and may explain the low levels of structuring observed. Gene flow estimates based on microsatellites, nuclear introns, and mtDNA suggest asymmetrical gene flow between mainland colonies and Kigigak Island, with more individuals on average dispersing from mainland populations to Kigigak Island than vice versa. The directionality of gene flow observed may be explained by the colonization of the YKD from northern glacial refugia or by YKD metapopulation dynamics.

Original languageEnglish (US)
Pages (from-to)878-893
Number of pages16
JournalCondor
Volume109
Issue number4
DOIs
StatePublished - Nov 1 2007
Externally publishedYes

Keywords

  • Common Eider
  • Gene flow
  • Population genetic structure
  • Somateria mollissima

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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