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Journal
Publications
Loehr J., K. Worley, A. Grapputo, J. Carey,
A. Veitch and D.W. Coltman. 2005. Evidence for cryptic glacial refugia
from North American mountain sheep mitochondrial DNA. J .
EVOL . BIOL. doi : 1 0 .1111/ j . 1 4 20-9101
Abstract
The separation of populations by ice sheets into large refugia can
account for much of the genetic diversity found in present day populations.
The evolutionary implications of small glacial refugia have not been as
thoroughly explored. To examine refugial origins of North American mountain
sheep Ovis spp., we analyzed a 604 bp portion of the mitochondrial DNA
(mtDNA) control region from 223 O. dalli and O. canadensis. Major refugia
were identified in eastern Beringia and southern North America, and we found
evidence for two smaller refugia situated between the Laurentide and
Cordilleran glaciers. Our results are the first to demonstrate support for
survival of any organism in the latter two refugia. These refugia also
appear to have conserved a genetic signal that confirms past hybridization
of O. dalli and O. canadensis.
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