rhinoceros auklet microsatellite data
We tested the hypothesis that segregation in wintering areas promotes population differentiation in a sentinel North Pacific seabird, the rhinoceros auklet (Cerorhinca monocerata). We collected tissue samples for genetic analyses on five breeding colonies in the western Pacific Ocean (Japan) and 13...
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Sprache: | eng |
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Zusammenfassung: | We tested the hypothesis that segregation in wintering areas promotes
population differentiation in a sentinel North Pacific seabird, the
rhinoceros auklet (Cerorhinca monocerata). We collected tissue samples for
genetic analyses on five breeding colonies in the western Pacific Ocean
(Japan) and 13 in the eastern Pacific Ocean (California to Alaska), and
deployed light-level geologgers on 12 eastern Pacific colonies to
delineate wintering areas. Loggers were deployed previously on one colony
in Japan. There was strong genetic differentiation between populations in
the eastern vs. western Pacific. Deep-ocean habitat along the northern
continental shelf appears to act as a barrier to dispersal; abundant in
the western and eastern Pacific Ocean, the rhinoceros auklet is virtually
absent as a breeder in the Aleutian Islands and Bering Sea, and no
loggered birds crossed the North Pacific in the non-breeding season. Late
Pleistocene glaciation over the North Pacific also might have forced a
southward range shift that isolated the western and eastern populations.
While genetic differentiation was strongest between the eastern vs.
western Pacific, there was also extensive differentiation within both
regional groups. In pairwise comparisons among eastern Pacific colonies,
the standardized measure of genetic differentiation (F’ST) was negatively
correlated with the extent of spatial overlap in wintering areas. That
result supports the hypothesis that segregation in the non-breeding season
promotes genetic structuring. Strong natal philopatry and a neritic
foraging habit probably also play roles. Widely distributed, vulnerable to
anthropogenic stressors, and exhibiting extensive genetic structure, the
rhinoceros auklet encompasses the scope of the conservation challenges
posed by seabirds. |
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DOI: | 10.5061/dryad.zs7h44j6j |