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

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 controvers...

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Bibliographic Details
Published in:Molecular ecology 2015-11, Vol.24 (21), p.5364-5378
Main Authors: Lavretsky, Philip, Dacosta, Jeffrey M, Hernández‐Baños, Blanca E, Engilis, Andrew, Jr, Sorenson, Michael D, Peters, Jeffrey L
Format: Article
Language:English
Subjects:
Anas platyrhynchos
Animals
anseriformes
Chromosomes
DNA, Mitochondrial - genetics
ducks
Ducks - classification
Ducks - genetics
elevated Z divergence
Evolution, Molecular
Genetic diversity
Genetic Speciation
genetic variation
Genetics, Population
Genomics
genotyping by sequencing
hybridization
loci
marker discordance
Mexico
Mitochondrial DNA
Models, Genetic
Molecular Sequence Data
phylogeography
Population Density
population size
Sequence Analysis, DNA
Sex Chromosomes - genetics
speciation
taxonomy
United States
Z chromosome
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Summary: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 Z‐linked sex chromosome loci. Between the two taxa, Z‐linked loci (ΦST = 0.088) were 5.2 times more differentiated than autosomal DNA (ΦST = 0.017) but comparable to mtDNA (ΦST = 0.092). This elevated Z differentiation deviated from neutral expectations inferred from simulated data that incorporated demographic history and differences in effective population sizes between marker types. Furthermore, 3% of Z‐linked loci, compared to
ISSN:0962-1083
1365-294X
DOI:10.1111/mec.13402