A survey of relationships between the spatial and temporal distributions of mallards and pond ecology in southwestern Ontario / Patrick R. Godin.
Material type:
TextSeries: Thesis. (M.Sc.)Publication details: Guelph, ON : University of Guelph, 1979.Description: viii, 129 leaves : ill. ; 28 cmOnline resources: Abstract: This study attempted to define which abiotic and biotic characteristics of ponds were associated with the use of ponds by mallard (Anas platyrhynchos) pairs, broods, post-breeding, and pre-migratory flocks.The study was conducted during 1977-78 on 39 ponds on a 10 km2 section of land near Cambridge, Ontario. Pond characteristics examined included:surface area; pond circumference; shoreline development; number of potential offshore loafing sites; width of peripheral terrestrial vegetation; amount of pond surface cover; water chemistry; aquatic vegetation frequency; aquatic invertebrate abundance; width of the substrate feeding zone for adult mallards; and the extent of mallard use. A 33% decline from 1977 to 1978 in the numbers of mallards observed on the study area reflected a general decline in mallard numbers throughout southwestern Ontario. Mallard pair densities of 2.3 km-2 in 1977 and 2.0 km-2 in 1978 were higher than the estimated breeding pair density of 0.62 pairs km-2 in so
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Thesis(M.Sc.)--University of Guelph, 1979.
"September, 1979."
Includes bibliographical references (leaves 108-117).
This study attempted to define which abiotic and biotic characteristics of ponds were associated with the use of ponds by mallard (Anas platyrhynchos) pairs, broods, post-breeding, and pre-migratory flocks.The study was conducted during 1977-78 on 39 ponds on a 10 km2 section of land near Cambridge, Ontario. Pond characteristics examined included:surface area; pond circumference; shoreline development; number of potential offshore loafing sites; width of peripheral terrestrial vegetation; amount of pond surface cover; water chemistry; aquatic vegetation frequency; aquatic invertebrate abundance; width of the substrate feeding zone for adult mallards; and the extent of mallard use. A 33% decline from 1977 to 1978 in the numbers of mallards observed on the study area reflected a general decline in mallard numbers throughout southwestern Ontario. Mallard pair densities of 2.3 km-2 in 1977 and 2.0 km-2 in 1978 were higher than the estimated breeding pair density of 0.62 pairs km-2 in so