Within-population structure highlighted by differential introgression across semipermeable barriers to gene flow in Anguilla Marmorata

Pierre Alexandre Gagnaire, Yuki Minegishi, Saliha Zenboudji, Pierre Valade, Jun Aoyama, Patrick Berrebi

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

In the marine environment, differential gene exchange between partially reproductively isolated taxa can result in introgression that extends over long distances due to high larval dispersal potential. However, the degree to which this process contributes to interlocus variance of genetic differentiation within introgressed populations remains unclear. Using a genome-scan approach in the Indo-Pacific eel Anguilla marmorata, we investigated the degree of interpopulation genetic differentiation, the rate of introgression, and within-population genetic patterns at 858 AFLP markers genotyped in 1117 individuals. Three divergent populations were identified based on clustering analysis. Genetic assignments of individuals revealed the existence of different types of hybrids that tended to co-occur with parental genotypes in three population contact zones. Highly variable levels of genetic differentiation were found between populations across the AFLP markers, and reduced rates of introgression were shown at some highly differentiated loci. Gene flow across semipermeable genetic barriers was shown to generate spatial introgression patterns at some loci which define within-population structure over long distances. These results suggest that differential introgression in subdivided populations may be relevant when interpreting spatial variation patterns displayed by outlying loci in other marine fish populations.

Original languageEnglish
Pages (from-to)3413-3427
Number of pages15
JournalEvolution
Volume65
Issue number12
DOIs
Publication statusPublished - 2011 Dec

Keywords

  • AFLP
  • Genome-scan
  • Genomic clines
  • Hybridization
  • Outlier loci
  • Speciation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Agricultural and Biological Sciences(all)

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