10.5061/DRYAD.0G6K1
Scordato, Elizabeth S.C.
University of Colorado Boulder
Wilkins, Matthew R.
University of Nebraska - Lincoln
University of Colorado Boulder
Semenov, Georgy
University of Arizona
Institute of Systematics and Ecology of Animals
Rubtsov, Alexander S.
State Darwin Museum; Moscow Russia
Kane, Nolan C.
University of Colorado Boulder
Safran, Rebecca J.
University of Colorado Boulder
Scordato, Elizabeth S. C.
University of Colorado Boulder
Data from: Genomic variation across two barn swallow hybrid zones reveals
traits associated with divergence in sympatry and allopatry
Dryad
dataset
2017
Genomics/Proteomics
Holocene
Hirundo rustica
National Science Foundation
https://ror.org/021nxhr62
DEB-CAREER 1149942
2017-07-25T13:54:58Z
2017-07-25T13:54:58Z
en
https://doi.org/10.1111/mec.14276
52942258 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Hybrid zones are geographic regions where isolating barriers between
divergent populations are challenged by admixture. Identifying factors
that facilitate or inhibit hybridization in sympatry can illuminate the
processes that maintain those reproductive barriers. We analyzed patterns
of hybridization and phenotypic variation across two newly-discovered
hybrid zones between three subspecies of barn swallow (Hirundo rustica).
These subspecies differ in ventral coloration and wing length, traits that
are targets of sexual and natural selection, respectively, and are
associated with genome-wide differentiation in allopatry. We tested the
hypothesis that the degree of divergence in these traits is associated
with the extent of hybridization in secondary contact. We applied measures
of population structure based on > 23,000 SNPs to confirm that
named subspecies correspond to distinct genomic clusters, and assessed
coincidence between geographic clines for ancestry and phenotype. Although
gene flow was ongoing across both hybrid zones and pairwise FST between
subspecies was extremely low, we found striking differences in the extent
of hybridization. In the more phenotypically differentiated subspecies
pair, clines for ancestry, wing length, and ventral coloration were steep
and coincident, suggestive of strong isolation and, potentially, selection
associated with phenotype. In the less phenotypically differentiated pair,
gene flow and phenotypic variation occured over a wide geographic span,
indicative of weaker isolation. Traits associated with genome-wide
differentiation in allopatry may thus also contribute to isolation in
sympatry. We discuss potentially important additional roles for
evolutionary history and ecology in shaping variation in the extent
hybridization between closely related pairs of subspecies.
scordato_BARS_genotype_estimatesIndividual genotype estimates for each
individual barn swallow (n=533) at each locus (n=23,251). Genotypes are
continuous values derived from Bayesian estimates of genotype. They can be
rounded to 0, 1, or 2 to replicated analyses that require genotype calls
(see supporting information for paper)scordato_BARS_metadataMetadata for
genotype estimates. File contains 533 rows corresponding to the genotype
file, with individual IDs, sampling locations, GPS coordinates, and taxon
classifications with corresponding color codes for plotting.
Russia