DOI: 10.5061/dryad.28660
title: Data from: Variation in age ratio of midcontinent greater white-fronted geese during fall migration

description: 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.
description: Data
 A1Microsoft Excel file
 which contains raw survey data for midcontinent greater white-fronted
 geese (Anser albifrons frontalis) migrating near Delta Junction Alaska
 during 2010 and 2011, organized in a single tab, “Data A1 – 2010-2011 Raw
 Data.” The “2010-2011 Raw Data” tab contains date, time, total adults,
 total juveniles, total not identified, total sample, proportion of
 juveniles, age ratio, percent of birds identified and
 location.Reference
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