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Showing 1 to 20 of 32 for “"Anas platyrhynchos"”.
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Thermoregulation of the White Pekin Duck, Anas Platyrhynchos
Made available in DSpace on 2014-12-14T13:39:37Z (GMT). No. of bitstreams: 1 7616138.pdf: 4042355 bytes, checksum: 60cdd0a1c190965806b0afef6e9e2d06 (MD5) Previous issue date: 1976
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An examination of the kinematics and behavior of mallards (Anas platyrhynchos) during water landings
… To examine this possibility, mallards (Anas playtrhynchos) were used as a study species and 177 water landings were recorded through the use of two camera systems with photogrammetric capabilities. This enabled the landing trajectory and landing transition kinematics to be tracked in …
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Taxonomic, ecological and quantitative examination of chewing lice (Insecta: Phthiraptera) on Canada geese (Branta canadensis) and mallards (Anas platyrhynchos) in Manitoba, Canada
Over 19 years chewing lice data from Canada geese and mallards were collected. From Canada geese (n=300) 48,669 lice were collected, including Anaticola anseris, Anatoecus dentatus, Anatoecus penicillatus, Ciconiphilus pectiniventris, Ornithobius goniopleurus, and Trinoton anserinum. The prevalence …
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Nesting Chronology of South Dakota Ducks
… classes. Early nesting species were mallards (Anas platyrhynchos) and pintails (A. acuta). Northern shovelers (A. clypeata), redheads (Aythya americana), and canvasbacks (A. valisineria) were intermediate nesters while blue-winged teal (Anas discors), gadwalls (A. strepera), and American …
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Factors Affecting Waterfowl Brood Use of Stock Ponds in South Dakota
… to 1.00 ha surface-water area. Blue-winged teal (Anas discors) broods were positively associated with alfalfa and negatively associated with total stream area on the study plot. Mallard (Anas platyrhynchos) broods were negatively associated with pasture and hayland. Pintail (Anas acuta) and …
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Habitat Preferences and Censusing of Waterfowl Broods On Stock Ponds In South Central South Dakota
… spp. were positively associated with mallard (Anas platyrhynchos), (A. strepera), northern shoveler (A. clypeata) and class 1 broods. Large differences in numbers of broods on study ponds between the 2 years were likely due to increased nesting cover provided by yellow sweet clover (Melilotus …
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Factors Influencing Habitat Use By Breeding Waterfowl in South Dakota
… coefficients of determination for mallards (Anas platyrhynchos), pintails (Anas acuta), blue-winged teal (Anas discors), and gadwall (Anas strepera). Coefficient of determination for these species were greatest in the central Coteau des Prairies, the James River Valley, and the Coteau du …
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Breeding Waterfowl Populations in South Dakota
… South Dakota in 1974. Blue-winged teal (Anas discors), mallard (Anas platyrhynchos), pintail (Anas acuta), and gadwall (Anas strepera) were, in that order, the most abundant species. Diving ducks constituted less than 5 percent of the population each year. Highest diving duck densities …
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Influence of body condition and homo- vs. heterosubtypic immunity on influenza A virus infection in mallard ducks : experimental infection data
… 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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Stopover duration and habitat use of spring-migrating dabbling ducks in the Wabash River Valley, USA
… migrating birds. Stopover duration for mallards (Anas platyrhynchos) and green-winged teal (Anas crecca) was approximately 17 days (95% CI: 12.6–22.9 days). This is shorter than current estimates used by conservation planners and may shift objectives. Additionally, mallards and green-winged teal …
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THE EVOLUTIONARY DEVELOPMENT OF CROWN GALLOANSERAE SKULLS: TRACKING CHANGES IN GALLIFORM AND ANSERIFORM CRANIAL DEVELOPMENT
… of two species of anseriforms, mallard duck (Anas platyrhynchos) and swan goose (Anser cygnoides), because skull ossification extends into these stages and therefore these criteria are necessary for robust comparisons. Subsequently, I qualitatively compared the ossification of each element of …
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Waterfowl Pair and Brood Use of Dug brood Complexes in East-Central South Dakota
… Pheasants (Phasianus colchicus), mallards (Anas platyrhynchos), and gadwalls (A. strepera) most frequently used dug brood complex islands for nesting. In the event of additional dug brood pond construction, consideration should be given to creating small, rectangular islands spaced as far …
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Use of Waterfowl Production Areas by Ducks and Coots in Eastern South Dakota
… made on four WPAs 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 …
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Movements, Survival, and Habitat Use of Mallard Broods Hatched from Predator Reduced Nesting Habitats in Eastern South Dakota
… 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 were used …
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The occurrence and toxicology of heavy metals in Chesapeake Bay waterfowl
… highest in largely herbivorous species, such as Anas platyrhynchos, Anas rubripes, and Anas strepera. Spent shot may be an important source for tissue burdens of lead in these ducks. No marked trends were observed between food habits and tissue concentrations of copper or zinc. Cadmium and lead …
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Resource Selection, Survival, and Departure of Adult Female Mallards From The Lake St. Clair Region During Autumn And Winter
During autumn and winter, mallards (Anas platyrhynchos) maximize fitness through their spatiotemporal distribution to avoid mortality risks while balancing trade-offs to access foods to undergo migration and maintain homeostasis. Thousands of mallards use Lake St. Clair as it is an important, but …
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Fuglafána Vatnshamravatns í Borgarfirði.
… voru grágæs (Anser anser), rauðhöfðaönd (Anas penelope), brandönd (Tadorna tadorna), álft (Cygnus cygnus), stokkönd (Anas platyrhynchos), kría (sterna paradisaea), hettumáfur (Larus ridibundus), svartbakur (Larus marinus) og stelkur (Tringa totanus). Álft var auk þess eina tegundin sem …
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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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Soil ingestion and lead concentration in wildlife species
… Canada geese (Branta canadensis) and mallards (Anas platyrhynchos) were 4.92 (± 0.60) and 11.73 (± 1.54), respectively. Diets of short-tailed shrews (Blarina brevicauda) consisted of 5.20 (± 1.87)% soil, white-footed mice (Peromyscus leucopus) 16.21 (± 4.85)%, meadow voles (Microtus …
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Distribution and Importance of Stockdams, Dugouts, and Natural Wetlands To Breeding Waterfowl In South Dakota
… 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 discors), …
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