Influence of upland cover on occupancy rates on nest structures by mallards / Michael J. Artmann.
Material type:
TextPublication details: Missoula, MT : University of Montana, 1999.Description: vi, 37 leaves : ill. ; 28 cmSubject(s): Online resources: Abstract: Artificial nest structures are one of the most cost effective methods for increasing mallard (Anas platyhynchos) nest success; efficacy of structures depends on both nest success and the rate at which they are occupied. Nest success in nest structures is usually high, but occupancy rates are highly variable. The factors causing this variation are largely unknown. The degree of 'competition' between nest structures and surrounding upland cover for nesting mallard hens is unknown, but commonly considered important. To address this question, I compared occupancy rates of structures in areas dominated by grassland (Grassland sites), to rates in areas dominated by cropland (Cropland sites).
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Thesis(M.S.)--University of Montana, 1999.
Includes bibliographical references (leaves 31-36).
Artificial nest structures are one of the most cost effective methods for increasing mallard (Anas platyhynchos) nest success; efficacy of structures depends on both nest success and the rate at which they are occupied. Nest success in nest structures is usually high, but occupancy rates are highly variable. The factors causing this variation are largely unknown. The degree of 'competition' between nest structures and surrounding upland cover for nesting mallard hens is unknown, but commonly considered important. To address this question, I compared occupancy rates of structures in areas dominated by grassland (Grassland sites), to rates in areas dominated by cropland (Cropland sites).