Winter and spring staging ecology of mallards in south central Nebraska / Dennis G. Jorde
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TextPublication details: Grand Forks, ND : University of North Dakota, 1981.Description: xv, 116 leaves : ill. ; 28 cmOnline resources: Abstract: Large numbers of mallards (Anas platyrhynchos) winter in or migrate through middle and northern latitudes of the midcontinent region in North America. Although an intensively studied species, the wintering and staging ecology of mallards north of traditional areas has received limited attention, leaving waterfowl administrators with limited information for developing management guidelines for mallard populations during these periods of the year. Mallard activity patterns, foraging strategy, and physcial condition were studied on the Platte River in south central Nebraska from mid-December to early April, 1978-80. Local movements, time budgets, food habits, physiology, and energetics during winter and early spring provided an improved perspective of mallard requirements during these stages of the annual cycle. Weather conditions had a major influence on habitat use. Mallard use of the Platte River rose markedly during the mild winter of 1980 and disparity of age and sex ratios was lowe
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Thesis(M.S.)--University of North Dakota, 1981.
Large numbers of mallards (Anas platyrhynchos) winter in or migrate through middle and northern latitudes of the midcontinent region in North America. Although an intensively studied species, the wintering and staging ecology of mallards north of traditional areas has received limited attention, leaving waterfowl administrators with limited information for developing management guidelines for mallard populations during these periods of the year. Mallard activity patterns, foraging strategy, and physcial condition were studied on the Platte River in south central Nebraska from mid-December to early April, 1978-80. Local movements, time budgets, food habits, physiology, and energetics during winter and early spring provided an improved perspective of mallard requirements during these stages of the annual cycle. Weather conditions had a major influence on habitat use. Mallard use of the Platte River rose markedly during the mild winter of 1980 and disparity of age and sex ratios was lowe