Variation in age ratio of midcontinent greater white-fronted geese during fall migration

Journal of Fish and Wildlife Management
By: , and 

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Abstract

Annual productivity is an important parameter for the management of waterfowl populations. Fall age ratio (juveniles:total birds) is an index of productivity of the preceding breeding season. However, differences in the timing of migration between family groups and nonbreeding birds may bias age-ratio estimates. We examined temporal variation in age ratios of midcontinent greater white-fronted geese Anser albifrons frontalis from interior and northwestern Alaska at a northern autumn staging area near Delta Junction, Alaska. Photographic sampling conducted near Delta Junction resulted in an annual age ratio of 0.388 ± 0.004 (mean ± SE) in 2010 and 0.390 ± 0.001 in 2011. Our study demonstrated temporal variation in age ratios over the duration of the migration period during August and September. We recommend that sampling be conducted for 3-d periods at the beginning, middle, and end of the migration period to account for temporal variation in migration of family groups.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Variation in age ratio of midcontinent greater white-fronted geese during fall migration
Series title Journal of Fish and Wildlife Management
DOI 10.3996/112015-JFWM-117
Volume 9
Issue 1
Year Published 2018
Language English
Publisher U.S. Fish and Wildlife Service
Contributing office(s) Alaska Science Center Biology WTEB
Description 8 p.
First page 340
Last page 347
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