10.5061/DRYAD.28660
Schock, Wade G.
University of Alaska Anchorage
Fischer, Julian B.
United States Fish and Wildlife Service
Ely, Craig R.
University of Alaska Anchorage
Stehn, Robert A.
United States Fish and Wildlife Service
Welker, Jeffrey M.
University of Alaska Anchorage
Causey, Douglas
University of Alaska Anchorage
Data from: Variation in age ratio of midcontinent greater white-fronted
geese during fall migration
Dryad
dataset
2018
Age Ratio
Staging Area
August-September 2011
August-September 2010
Mid-continent Greater White-fronted Goose
Anser albifrons frontalis
2018-01-30T19:39:10Z
2018-01-30T19:39:10Z
en
https://doi.org/10.3996/112015-jfwm-117
15332638 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
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.
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 A1Bromley RG, Rothe TC. 2003.
Conservation assessment for the dusky Canada goose (Branta canadensis
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Alaska