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- W2023374033 abstract "Abstract Speciation is regarded primarily as a bifurcation from an ancestral species into two distinct taxonomic units, but gene flow can create complex signals of phylogenetic relationships, especially among different loci. We evaluated several hypotheses that could account for phylogenetic discord between mitochondrial DNA (mt DNA ) and nuclear DNA (nu DNA ) within Hawaiian duck ( Anas wyvilliana ), including stochastic lineage sorting, mt DNA capture and widespread genomic introgression. Our results best support the hypothesis that the contemporary Hawaiian duck is descended from an ancient hybridization event between the mallard ( Anas platyrhynchos ) and Laysan duck ( Anas laysanensis ). Whereas mt DNA clearly shows a sister relationship between Hawaiian duck and mallard, nu DNA is consistent with a genetic mosaic with nearly equal contributions from Laysan duck and mallard. In addition, coalescent analyses suggest that gene flow from either mallard or Laysan duck, depending on the predefined tree topology, is necessary to explain contemporary genetic diversity in Hawaiian ducks, and these estimates are more consistent with ancient, rather than contemporary, hybridization. Time since divergence estimates suggest that the genetic admixture event occurred around the Pleistocene–Holocene boundary, which is further supported by circumstantial evidence from the Hawaiian subfossil record. Although the extent of reproductive isolation from either putative parental taxon is not currently known, these species are phenotypically, genetically and ecologically different, and they meet primary criteria used in avian taxonomy for species designation. Thus, the available data are consistent with an admixed origin and support the hypothesis that the Hawaiian duck may represent a young hybrid species." @default.
- W2023374033 created "2016-06-24" @default.
- W2023374033 creator A5040463818 @default.
- W2023374033 creator A5047451796 @default.
- W2023374033 creator A5065001790 @default.
- W2023374033 creator A5091225253 @default.
- W2023374033 date "2015-04-29" @default.
- W2023374033 modified "2023-10-12" @default.
- W2023374033 title "Genetic admixture supports an ancient hybrid origin of the endangered Hawaiian duck" @default.
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- W2023374033 doi "https://doi.org/10.1111/jeb.12637" @default.
- W2023374033 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25847706" @default.
- W2023374033 hasPublicationYear "2015" @default.
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