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Showing 1 to 20 of 52 for “"Mallard"”.
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MALLARD NESTING ECOLOGY IN THE GREAT LAKES
… Past decisions in management of Great Lakes mallard (Anas platyrynchos) populations were based largely on paradigms established in the mid-continent because regional data were lacking. Recent sensitivity analyses from the Great Lakes Mallard Study show that population growth (i.e., λ) is most …
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MALLARD NESTING ECOLOGY IN THE GREAT LAKES
… Past decisions in management of Great Lakes mallard (Anas platyrynchos) populations were based largely on paradigms established in the mid-continent because regional data were lacking. Recent sensitivity analyses from the Great Lakes Mallard Study show that population growth (i.e., λ) is most …
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Population Biology of Daubaylia potomaca (Nematoda:Rhabditida) in Mallard Lake, North Carolina
Daubaylia potomaca is a unique nematode parasite that has a direct life cycle through the pulmonate snail Helisoma anceps with the adult female nematode being the infective stage. Found in all tissues and blood spaces, this parasite was ultimately found to decrease the life span of its snail host. …
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Fathead Minnows, Aquatic Invertebrates, and Mallard Duckling Interactions in Man-Made Ponds
… minnows were stocked in half of the cells. Mallard ducklings were placed on both stocked and control cells. Nine 5-week-old ducklings were used in the analysis. The presence of fathead minnows did not affect duckling growth rates, presumably because by this age the ducklings used plant …
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Cover Use and Activity Time Budget of Blue-Winged Teal, Mallard, and Pintail Broods
Blue-winged teal (Anas discors), mallard (A. platyrhynchos), and pintail (A. acuta) broods were observed on 17 days between 25 June and 30 July, 1976. Brood activities and cover uses were recorded continuously from first light until dark. Observations of 269 broods from three wetlands were …
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Breeding Ecology and Productivity of Mallards and Mallard-grey Duck Hybrids in New Zealand
Introduced primarily for sport hunting, mallards (Anas platyrhynchos) became widely established in New Zealand (NZ) following the release of 25,000 individuals during 1940–1960. Hybridisation and introgression between mallards and the native grey duck (A. superciliosa) has been extensive, and …
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Survival, Movements, and Habitat Use of Mallard Broods Produced on Overwater Nesting Structures in Eastern South Dakota
Survival, movements, and habitat use of mallard (Anas platyrhynchos) broods produced from overwater nesting structures in eastern South Dakota were evaluated during spring and summer 1998-99. Two study sites with overwater nesting structures were chosen in 1998, representing a large semipermanent …
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Movements, Survival, and Habitat Use of Mallard Broods Hatched from Predator Reduced Nesting Habitats in Eastern South Dakota
… of our study were: to determine movements of mallard (Anas platyrhynchos) broods from nest site to brood rearing wetlands, and thereafter; to determine survival of broods hatched from SUMP areas; to determine general habitat characteristics of brood rearing wetlands. Three types of SUMP areas …
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Influence of body condition and homo- vs. heterosubtypic immunity on influenza A virus infection in mallard ducks : experimental infection data
Migrating waterfowl, particularly mallards (<italic>Anas platyrhynchos</italic>), are implicated in the global spread of influenza A viruses (IAVs). Experimental infection studies are used to assess a bird's ability to maintain IAV, but these studies have not represented the natural variation in …
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The litigation between Greenhalgh and the Mallard family, [1941-1950]: and its influence on company law in England, Australia and South Africa
On 1 July 1941 Mr Greenhalgh issued a writ against his co-shareholders in the Arderne Cinema Company, and thus began a series of cases which ended with a Court of Appeal Judgment handed down on,10 November 1950. During the almost ten-year period of the litigation, seven actions were brought by Mr …
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An Evaluation of the Roadside Technique for Censusing Breeding Waterfowl
… wetlands. Within same limits counts needed for mallard (Anas platyrhynchos) were at least four for miles and three for wetlands. Shorter transects, used in 1967 required more counts. Transects 21 miles long required up to 10 counts based on miles and 11 based on wetlands. The seven-mile transect …
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The effects of moist and dry heat cooking upon mercury levels in breast tissue and the distribution of mercury in organs of McGraw Mallard ducks administered methyl mercury chloride
Thesis (M.S.)--Michigan State University. Dept. of Food Science and Human Nutrition, 1972
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Spatiotemporal Modeling for Wildlife Demographic Analysis: Bridging Analysis to Waterfowl Conservation
… highlight conservation issues for midcontinent mallard populations. My second chapter serves as a guide to using spatially explicit models in population ecology. In a comprehensive literature review, I discuss spatial autocorrelation in demographic models and show how spatial models can mitigate …
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Variables Associated With Breeding Waterfowl On South Dakota Stock Ponds
… Shoreline distance account for more variation in mallard (Anas Platyrhmchos) and blue-winged teal (A. discors) pairs than any other single variable. Ponds used by these pairs and shoreline distances that averaged 590 m which was significantly (P<0.005) greater than the mean shoreline distances of …
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Use of Waterfowl Production Areas by Ducks and Coots in Eastern South Dakota
… in 1971 and blue-winged teal (Anas discors), mallard (Anas platyrhynchos), and gadwall (Anas strepera) were found to be the most abundant. On the Eriksrud area, the most common nesting ducks were blue-winged teal and canvasback (Aythya valisineria), eight nests of each being located during the …
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Influence of Habitat Characteristics on Wetland Bird Abundance and Species Richness at Ordway Prairie, South Dakota
… teal (Anus discors), gadwall (A. strepera), and mallard (A. platyrhynchos). Killdeer (Charadrius vociferus) and Wilson’s phalarope (Phalaropus tricolor) were the most common breeding shorebirds. Lesser yellowlegs (Tringa flavipes) were the most commonly occurring migrant shorebird. Abundance …
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Evaluating occupancy and the range dynamics of invasive bird species in South Africa
… and population range dynamics of the Myna and Mallard species are individually investigated in the South African region by fitting static and dynamic occupancy models to a set of citizen science data for a 10-year study period between 2010-2019. The occupancy and detectability of the respective …
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Distribution and Importance of Stockdams, Dugouts, and Natural Wetlands To Breeding Waterfowl In South Dakota
… most waterfowl populations throughout the study. Mallard (Anas platyrhynchos) and American wigeon (Anas crecca) populations in 1973 and mallard, pintail (Anas acuta), American wigeon, and northern shoveler (Anas clypeata) populations in 1974 used stockdams extensively. Blue-winged teal (Anas …
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