Level ditching study at the Wilson River Marshes. JF Giroux
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TextPublication details: MB : 1978Online resources: Abstract: In 1978, a study was initiated at the Wilson River Marshes, Manitoba, to evaluate the existing internal ditches created in 1976. A second objective was to gather information on waterfowl population, vegetation,invertebrates, water and soil quality before the construction of addtional ditches. Redhead (Aythya americana), mallard (Anas platyrhynchos) and blue-winged teal (A. discors) were the most common ducks. Aerial counts showed a density of 2.7 indicated breeding pairs per km of shoreline or 0.16 pairs per ha. Waterfowl production evaluated by a helicopter survey and a beat-out was also low with 2.1 broods per km or 0.13 per ha. The staging population was evaluated at about 100 birds being mostly mallards. A low density of 3.4 nests per ha was found on the spoils associated with existing ditches. All the nests found on those spoils or in the marsh failed to hatch eggs. More submergent vegetation was established in the bottom than in the slopes of the ditches. In general, little use
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In 1978, a study was initiated at the Wilson River Marshes, Manitoba, to evaluate the existing internal ditches created in 1976. A second objective was to gather information on waterfowl population, vegetation,invertebrates, water and soil quality before the construction of addtional ditches. Redhead (Aythya americana), mallard (Anas platyrhynchos) and blue-winged teal (A. discors) were the most common ducks. Aerial counts showed a density of 2.7 indicated breeding pairs per km of shoreline or 0.16 pairs per ha. Waterfowl production evaluated by a helicopter survey and a beat-out was also low with 2.1 broods per km or 0.13 per ha. The staging population was evaluated at about 100 birds being mostly mallards. A low density of 3.4 nests per ha was found on the spoils associated with existing ditches. All the nests found on those spoils or in the marsh failed to hatch eggs. More submergent vegetation was established in the bottom than in the slopes of the ditches. In general, little use