4 Works

Data from: Becoming pure: identifying generational classes of admixed individuals within lesser and greater scaup populations

Philip Lavretsky, Jeffrey Peters, Kevin Winker, Volker Bahn, Irina Kulikova, Yuri Zhuravlev, Robert Wilson, Christopher Barger, Kirsty Gurney, Kevin McCracken, Jeffrey L. Peters, Chris Barger & Kevin G. McCracken
Estimating the frequency of hybridization is important to understand its evolutionary consequences and its effects on conservation efforts. In this study, we examined the extent of hybridization in two sister species of ducks that hybridize. We used mitochondrial control region sequences and 3,589 double-digest restriction-associated DNA sequences (ddRADseq) to identify admixture between wild lesser scaup (Aythya affinis) and greater scaup (A. marila). Among 111 individuals, we found one introgressed mitochondrial DNA haplotype in lesser scaup...

Data from: Recent speciation and elevated Z-chromosome differentiation between sexually monochromatic and dichromatic species of Australian teals

Kirandeep K. Dhami, Leo Joseph, David A. Roshier & Jeffrey L. Peters
Sex chromosomes potentially have an important role in speciation and often have elevated differentiation between closely related species. In birds, traits associated with male plumage, female mate preference, and hybrid fitness have been linked to the Z-chromosome (females are heterogametic, ZW). We tested for elevated Z-differentiation between two recently diverged species of Australian ducks, the sexually monochromatic grey teal Anas gracilis and the dichromatic chestnut teal A. castanea. Despite prominent morphological differences, these two species...

Data from: Speciation genomics and a role for the Z chromosome in the early stages of divergence between Mexican ducks and mallards

Philip Lavretsky, Jeffrey M. DaCosta, Blanca E. Hernández-Baños, , Michael D. Sorenson, Jeffrey L. Peters & Andrew Engilis
Speciation is a continuous and dynamic process, and studying organisms during the early stages of this process can aid in identifying speciation mechanisms. The mallard (Anas platyrhynchos) and Mexican duck (A. [p.] diazi) are two recently diverged taxa with a history of hybridization and controversial taxonomy. To understand their evolutionary history, we conducted genomic scans to characterize patterns of genetic diversity and divergence across the mitochondrial DNA (mtDNA) control region, 3523 autosomal loci and 172...

Data from: Genetic admixture supports an ancient hybrid origin of the endangered Hawaiian duck

Philip Lavretsky, , John M. Eadie, Jeffrey L. Peters & A. Engilis
Speciation is regarded primarily as a bifurcation from an ancestral species into two distinct taxonomic units, but gene flow can create different signals of phylogenetic relationships among different loci. We evaluated several hypotheses that could account for phylogenetic discord between mitochondrial DNA (mtDNA) and nuclear DNA (nuDNA) within Hawaiian ducks (Anas wyvilliana), including stochastic lineage sorting, mtDNA capture, and widespread genomic introgression. Our results best support the hypothesis that the contemporary Hawaiian duck is descended...

Registration Year

  • 2015

Resource Types

  • Dataset


  • Wright State University
  • University of California, Davis
  • University of Saskatchewan
  • University of Alaska Fairbanks
  • National Autonomous University of Mexico
  • University of Miami
  • Alaska Department of Fish and Game
  • Commonwealth Scientific and Industrial Research Organisation
  • Boston University