Uncovering the Genomic Basis of Parallel Allochronic Divergence in Two Pelagic Seabird Species Complexes (Hydrobates spp.)
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Authors
Yoo, Gihyun
Date
Type
thesis
Language
eng
Keyword
Genetic parallelism , Introgression , Allochrony , Population divergence , Whole-genome sequencing , Storm-petrel
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Abstract
While parallel evolution, the repeated evolution of similar traits in related taxa, provides important insights into the mechanisms and constraints underlying evolution, whether parallel traits originate from the same genomic regions is unclear. To investigate the genomic basis of parallel evolution, I examined populations of the band-rumped and Leach’s storm-petrel species complexes (Hydrobates spp). Many colonies of these highly pelagic seabirds contain sympatric populations that independently diverged in breeding season – an example of parallel allochronic divergence. I used low-coverage whole-genome sequences of 115 birds, representing all colonies with allochronic populations. For each colony, I identified genomic outliers differentiating seasonal populations using PCAdapt and windowed FST scans and examined whether the same outliers were detected in multiple colonies – i.e. genetic parallelism. I complemented the outlier analyses with tests of introgression – D and fdM statistics – between colonies to further clarify the likely genomic mechanism underlying allochrony. Despite some shared outliers, genetic parallelism was low among archipelagos. Moreover, evidence of introgression between colonies were generally not consistent with the patterns of seasonal population divergence. However, signals of introgression around outliers for some North Atlantic archipelagos suggest that introgression may have influenced allochronic divergence in those colonies. Combined, these patterns potentially indicate that allochronic divergence in storm-petrels occurred mainly through independent adaptations in each archipelago, with contributions from standing genetic variation and introgression.
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Proquest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owne