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Showing 1 to 20 of 145 for “"waterfowl"”.
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Breeding Waterfowl Populations in South Dakota
Breeding waterfowl in South Dakota were censused on 500 legal quarter sections within 125 clusters representing a proportional stratified random sample of 0.16 percent of the state area. Two breeding pair counts, one in May and second in June, were conducted each year on the sample units in 1973 …
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Variables Associated With Breeding Waterfowl On South Dakota Stock Ponds
… watering ponds by indicated breeding pairs of waterfowl was measured in the western two-thirds of South Dakota from 1973 to 1976. Multiple regression and discriminant analyses were used to describe the habitat associated with pairs of each species. Habitat variables explained 35-47 percent of …
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An Evaluation of the Roadside Technique for Censusing Breeding Waterfowl
… of the roadside technique for censusing breeding waterfowl was conducted in east-central South Dakota. On the 54-mile transect used in 1968, number of coutns necessary to be within 20 percent of population mean with specified confidence of 0.90 for blue-winged teal (Anas discors) and gadwall (Anas …
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Waterfowl Production in the James River Valley of South Dakota
A study of waterfowl production was conducted on two study areas in the James River Valley of South Dakota in 1971 and 1972. Its objectives were to measure rates of reproductive success and to determine the effect of land use and other influences on duck production. The five most abundant species …
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Breeding Waterfowl Use of Intermittent Streams, McHenry County, North Dakota
… North Dakota were censured for breeding pairs of waterfowl in 1977 and 1978. Pair count data were available for 1976. Emphasis of this study was placed on the narrow meandering portions of the streams. High dabbling duck (Anas spp.) densities were observed in 1977 and 1978; 6.11 pairs per ha and …
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Factors Influencing Habitat Use By Breeding Waterfowl in South Dakota
… adjacent upland conditions, and corresponding waterfowl populations were surveyed on 500 quarter sections in 125 clusters proportionally stratified within eight physiographic strata in South Dakota. Two survey were conducted, one in May and a second in June, each year during 1973 and 1974. …
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Pheasant Use and Waterfowl Production on State and Private Lands
Ring-necked pheasant (Phasianus colchicus) use on state-owned game production areas was compared to that on privately-owned areas in east-central South Dakota. Four 80-acre and four 160-acre tracts of state lands were paired with private areas of the same size having the same amount of wetland and …
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Functional Anatomy of the Feeding Apparatus in Waterfowl (Aves: Anatidae)
Made available in DSpace on 2014-12-04T22:45:49Z (GMT). No. of bitstreams: 1 0010483.pdf: 14603000 bytes, checksum: 8a2f473561dfd0489915e19250152c18 (MD5) Previous issue date: 1954
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Spatiotemporal Modeling for Wildlife Demographic Analysis: Bridging Analysis to Waterfowl Conservation
Examining variation in ecological systems is critical to understanding the fundamental demographic processes (e.g. reproduction, survival, growth, and dispersal) that govern populations and manage them in an increasingly altered world. Population dynamics often respond to environmental alterations, …
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An Evaluation of Waterfowl Production Surveys in Eastern South Dakota, 1995
… U. S. Fish and Wildlife Service's (USFWS) Aerial Waterfowl Production and Habitat Survey (production survey) in eastern South Dakota. Survey 1 was conducted before and Survey 2 was conducted during the production survey, while Surveys 3 and 4 were conducted after the production survey. During this …
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Factors Affecting Waterfowl Brood Use of Stock Ponds in South Dakota
A July waterfowl brood survey was conducted from 1973 to 1976 on stock ponds located within four physiographic strata in South Dakota. Information was collected on weather, stock pond characteristics, land use and the condition of other wetlands located within the quarter section (64.8 ha) study …
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Ecology of spring-migrating waterfowl within the lower Wabash River floodplain
… is an understudied, but important time for waterfowl as conditions faced during this period may affect reproductive success. Therefore, increasing our understanding of waterfowl ecology during spring is vital for maintaining desired population levels. The Midwestern United States has lost …
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Environmental influences on moult and movement strategies in southern African waterfowl
Waterfowl annual life history events in north-temperate regions are driven primarily by predictable seasonal variations in temperature. In contrast, the spatio-temporal availability of adequate resources to waterfowl in the semi-arid regions of southern Africa is determined by rainfall which is …
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The occurrence and toxicology of heavy metals in Chesapeake Bay waterfowl
… accumulations of heavy metals in Chesapeake Bay waterfowl and to determine effects of chronic cadmium and lead ingestion on energy metabolism in waterfowl. Concentrations of cadmium, lead, copper, and zinc were measured in 774 livers, 266 kidneys, and 271 ulnar bones from 15 species of ducks …
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Evaluation of Duck Production On Waterfowl Production Areas in Northeast North Dakota
An investigation of duck production on six Waterfowl Production Areas (WPA’s) in northeastern North Dakota was conducted during 1970-73. This investigation was conducted in conjunction with habitat-manipulation study by the Northern Prairie Wildlife Research Center that entailed prescribed burning …
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Aspects of Mammalian Predation on Upland Nesting Waterfowl in Central North Dakota
… impact of mammalian predation on upland nesting waterfowl was studied in central- North Dakota during the summers of 1987 and 1988. Survival of artificial nests was examined in relation to nest density, vegetation cover, distance from roads, active predator dens, and other artificial nests in a …
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A survey of the summer waterfowl of a township near Gull, Michigan
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Zoology, 1953
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Grassland and breeding bird use of moist-soil wetlands managed for waterfowl
Many species of breeding birds are declining in the United States, and grassland birds are among those experiencing the steepest declines. One of the most widely accepted reasons for decreasing populations is habitat loss. For grassland birds in the midwestern United States during the spring and …
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