Habitat use, movements and survival of mallard broods in southwestern Manitoba / Jay Joseph Rotella.
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TextPublication details: ID : University of Idaho, 1990.Description: ix, 66 leaves : ill. , map ; 28 cmOnline resources: Abstract: Brood and duckling survival were estimated for 69 mallard (Anas platyrhynchos) broods in southwestern Manitoba, 1987-89. This study provided the first estimates for Canada and the largest sample of broods ever monitored. Relationships among survival, habitat conditions, and hatch date were investigated. Annual brood- and duckling-survival rates averaged 0.49 and 0.22, respectively. Wetland conditions varied (P<0.05) among years. Brood survival was highest (P = 0.09) in the wettest year. Annual duckling-survival rates were similar (P = 0.13). Brood survival was directly related to wetland density and inversely related to hatch date. Duckling survival followed similar trends. My survival estimates are the lowest reported. Habitat-selection and movement data from 29 broods were analyzed. No wetland type was preferred (P > 0.1),habitat selection varied among broods, and there was no consistent trend in selection. Broods spent 10, 5, and 85% of their time on seasonal,small semi-permanen
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Thesis(Ph.D.)--University of Idaho, 1990.
Includes bibliographical references.
Brood and duckling survival were estimated for 69 mallard (Anas platyrhynchos) broods in southwestern Manitoba, 1987-89. This study provided the first estimates for Canada and the largest sample of broods ever monitored. Relationships among survival, habitat conditions, and hatch date were investigated. Annual brood- and duckling-survival rates averaged 0.49 and 0.22, respectively. Wetland conditions varied (P<0.05) among years. Brood survival was highest (P = 0.09) in the wettest year. Annual duckling-survival rates were similar (P = 0.13). Brood survival was directly related to wetland density and inversely related to hatch date. Duckling survival followed similar trends. My survival estimates are the lowest reported. Habitat-selection and movement data from 29 broods were analyzed. No wetland type was preferred (P > 0.1),habitat selection varied among broods, and there was no consistent trend in selection. Broods spent 10, 5, and 85% of their time on seasonal,small semi-permanen