Phylogeography of a migratory songbird across its Canadian breeding range: Implications for conservation units
Date
2017-06-28Author
Haché, Samuel
Bayne, Erin M.
Villard, Marc-André
Proctor, Heather
Davis, Corey S.
Stralberg, Diana
Janes, Jasmine K.
Hallworth, Michael T.
Foster, Kenneth R.
Chidambara-vasi, Easwaramurthyvasi
Grossi, Alexandra A.
Gorrell, Jamieson C.
Krikun, Richard
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Show full item recordAbstract
The objectives of this study were to describe and evaluate potential drivers of genetic
structure in Canadian breeding populations of the Ovenbird, Seiurus aurocapilla. We
performed genetic analyses on feather samples of individuals from six study sites
using nuclear microsatellites. We also assessed species identity and population genetic
structure of quill mites (Acariformes, Syringophilidae). For male Ovenbirds breeding in
three study sites, we collected light-level geolocator data to document migratory
paths and identify the wintering grounds. We also generated paleohindcast projections
from bioclimatic models of Ovenbird distribution to identify potential refugia
during the last glacial maximum (LGM, 21,000 years before present) as a factor explaining
population genetic structure. Birds breeding in the Cypress Hills (Alberta/Saskatchewan) may be considered a distinct genetic unit, but there was no evidence for genetic differentiation among any other populations. We found relatively strong migratory connectivity in both western and eastern populations, but some evidence of mixing among populations on the wintering grounds. There was also little genetic variation among syringophilid mites from the different Ovenbird populations. These results are consistent with paleohindcast distribution predictions derived from two different global climate models indicating a continuous single LGM refugium, with the
possibility of two refugia. Our results suggest that Ovenbird populations breeding in
boreal and hemiboreal regions are panmictic, whereas the population breeding in
Cypress Hills should be considered a distinct management unit.
Identifier (Other)
DOI: 10.1002/ece3.3170DOI: 10.25316/IR-17
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