Spatiotemporally consistent genomic signatures of reproductive isolation in a moving hybrid zone

Studies of hybrid zone dynamics often investigate a single sampling period and draw conclusions from that temporal snapshot. Stochasticity can, however, result in loci with spurious outlier patterns, which is exacerbated by limited temporal or geographic sampling. Comparing admixed populations from...

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Bibliographic Details
Published in:Evolution 2014-11, Vol.68 (11), p.3066-3081
Main Authors: Taylor, Scott A., Curry, Robert L., White, Thomas A., Ferretti, Valentina, Lovette, Irby
Format: Article
Language:English
Subjects:
Ancestry
Animal populations
Animal reproduction
Animals
Birds
Black-capped chickadee
Carolina chickadee
Clines
Divergence
Evolution
Evolutionary genetics
Gene loci
Genetic loci
Genomes
genomic cline
Genomics
genotyping by sequencing (GBS)
Hybridity
Hybridization, Genetic
Hybrids
introgression
Loci
Outliers
Passeriformes - classification
Passeriformes - genetics
Poecile
Reproductive Isolation
Sampling
Sequence Analysis, DNA
Stochasticity
United States
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Summary:Studies of hybrid zone dynamics often investigate a single sampling period and draw conclusions from that temporal snapshot. Stochasticity can, however, result in loci with spurious outlier patterns, which is exacerbated by limited temporal or geographic sampling. Comparing admixed populations from different geographic regions is one way to detect repeatedly divergent genomic regions potentially involved in reproductive isolation. Temporal comparisons also allow us to control partially for the role of stochasticity, but the power of temporal sampling has not yet been adequately explored. In North America, black-capped (Poecile atricapillus) and Carolina (P. carolinensis) chickadees hybridize in a contact zone extending from New Jersey to Kansas. The hybrid zone is likely maintained by strong intrinsic selection against hybrids, and it is moving north. We used a reduced representation genomic approach and temporally spaced sampling—two samples of ∼80 individuals separated by a decade—to determine the pattern and consistency of selection and genomic introgression in the chickadee hybrid zone. We report consistently low introgression for highly divergent loci between P. atricapillus and P. carolinensis in this moving hybrid zone. This is strong evidence that these loci may be linked to genomic regions involved in reproductive isolation between chickadees.
ISSN:0014-3820
1558-5646
DOI:10.1111/evo.12510