Migration of Willow Ptarmigan in Arctic Alaska’
ABSTRACT. Willow ptarmigan (Lagopus lagopus) migrate southward in autumn through Anaktuvuk Pass in the Brooks Range of Alaska and move northward in late winter to their principal nesting grounds on the arctic slope. In the morphologically homogeneous population four categories were distinguished-adu...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.7797 http://pubs.aina.ucalgary.ca/arctic/Arctic20-2-77.pdf |
| Summary: | ABSTRACT. Willow ptarmigan (Lagopus lagopus) migrate southward in autumn through Anaktuvuk Pass in the Brooks Range of Alaska and move northward in late winter to their principal nesting grounds on the arctic slope. In the morphologically homogeneous population four categories were distinguished-adult and juvenile males, adult and juvenile females-month by month at three localities. Adult males pre-ponderate in winter in their northern range, a large proportion ofjuveniie males winter at Anaktuvuk, and females preponderate in the southern wintering range. Each age-sex category moves according to its own program and flocks change composition. R6SUM6. Migration du lagopade des saules duns 1’Alaska arctique. A l’automne, le lagoptde des saules (Lagopus lagopus) migre vers le sud par la passe d’Anaktuvuk, dans la chaine de Brooks, Alaska; 8 la fin de l’hiver, il revient vers le nord jusqu’8 ses principaux terrains de nichte situts sur le versant arctique. Dam une population morphologiquement domogtne, on a distingut, mois par mois, en trois localitb difftrentes, quatre cattgoriea h’individus- mlles adultes, mlles juvtniles, femelles adultes et femelles juvtniles. En diver, les mlles adultes l’emportent en nombre dans le nord de l’aire de migration: une |
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