Reproductive characteristics of migratory Golden Eagles in Denali NationalPark, Alaska

Citation
Cl. Mcintyre et Lg. Adams, Reproductive characteristics of migratory Golden Eagles in Denali NationalPark, Alaska, CONDOR, 101(1), 1999, pp. 115-123
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
CONDOR
ISSN journal
0010-5422 → ACNP
Volume
101
Issue
1
Year of publication
1999
Pages
115 - 123
Database
ISI
SICI code
0010-5422(199902)101:1<115:RCOMGE>2.0.ZU;2-P
Abstract
We describe reproductive characteristics of Golden Eagles (Aquila chrysaeto s) breeding in Denali National Park, Alaska during an entire snowshoe hare (Lepus americanus) cycle, 1988-1997. Data on nesting eagles were collected at 58 to 72 nesting areas annually using two aerial surveys. Surveys were c onducted during the incubation period to determine occupancy and nesting ac tivities and late in the nestling period to count nestlings and determine n esting success. Annual occupancy rates of nesting areas did not vary signif icantly, whereas laying rates, success rates, and mean brood size varied si gnificantly over the study period. Fledgling production for the study popul ation varied sevenfold during the ten-year period. Laying rates, mean brood size, and overall population productivity were significantly correlated wi th abundance of cyclic snowshoe hare and Willow Ptarmigan (Lagopus lagopus) populations. Reproductive rates of Golden Eagles in Denali were similar to those of Golden Eagles from other high latitude study areas in North Ameri ca, but lower than for Golden Eagles from temperate zone study areas in Nor th America.