A Study of the Breeding Habitat and Productivity of Canvasback and Redhead Ducks in Southwestern Manitoba and the Use of Remote Sensing in the Interpretation of Habitat PDF Download
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Author: Ronald Murray William Zdan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ronald Murray William Zdan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jerome H. Stoudt
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 526
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A study of canvasback (Aythya valisineria) breeding populations, nest success, productivity, and habitat requirements was conducted from 1961 to 1972 on a 181.3 square kilometer area south of Minnedosa, Manitoba.
Author: National Library of Canada
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1058
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Author: David P. Olson
Publisher:
ISBN:
Category : Birds
Languages : en
Pages : 220
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This study is an attempt to compare canvasback (Aythya valisineria) and redhead (Aythya americana) breeding populations and productivity on small prairie potholes, a large marsh, and a large shallow lake. The objectives are: 1) to record the changes in the sex and age composition and the size of canvasback and redhead breeding populations during the reproductive season; 2) to compare large and small habitats in relation to nesting and brood success; and 3) to investigate the interrelationships between canvasbacks and redheads attempting to nest on the same areas. The canvasback and redhead are diving ducks of the tribe Aythyini and both species are native only to the North American continent. They are quite similar in size, appearance and feeding behavior, but there is even more similarity in the habitats they use, particularly nesting habitat. Both species construct over-water nests in dense, emergent, aquatic plant cover. The canvasback tends to nest somewhat earlier than the redhead.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 762
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Author: Richard L. Schroeder
Publisher:
ISBN:
Category : Canvasback
Languages : en
Pages : 32
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Author: Lewis M. Cowardin
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 32
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Author: Jerome H. Stoudt
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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Author: Lewis M. Cowardin
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 32
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During 1987-90, we used high-altitude photography, aerial videography, counts, and models to estimate sizes of breeding populations of dabbling ducks (Anatinae) and duck production and to identify duck habitat on U.S. Fish and Wildlife Service land and easements and on private land pothole region of the United States. in the prairie km2). Wetland area (ha per km2) The study area contained about 3.1 million wetland basins (28,490 was highest on service-owned land; wetland-basin density was greatest on service easements. Temporary and seasonal wetlands were underrepresented and lakes were overrepresented on service-owned land. Seventy-eight percent of all basins were less than 0.41 ha. Cropland dominated private land. Pond density decreased from 4.4/km2 in 1987 to 3.4/km2 in 1990 and pond area, from 7.2 ha/km2 to 2.7 ha/km2. The density of the blue-winged teal was greatest (3.4 pairs/km) and was followed in magnitude by those of the mallard (2.1 pairs/km2), the gadwall (1.8 pairs/km2), the northern pintail (0.8 pairs/km), and the redhead (0.8 pairs/km2). Duck density was consistently highest on service-owned land. The decline of breeding-population sizes in 1987-90 closely corresponded to losses of pond numbers and pond area. The density of breeding pairs per pond was inversely related to pond density, suggesting that breeding ducks tended to concentrate on the remaining ponds as drought intensified. The production of recruits followed the same pattern as breeding-population sizes. We estimated that 2.5% of the ducklings hatched on service-owned land, which was 1.3% of the study area; 19.6% hatched on service easements, which were 14.2% of the study area; and 77.9% hatched on private land, which was 84.6% of the study area.
Author: United States. Bureau of Sport Fisheries and Wildlife
Publisher:
ISBN:
Category : Canvasback
Languages : en
Pages : 56
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