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Showing 1 to 20 of 30 for “"Mallards"”.
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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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An examination of the kinematics and behavior of mallards (Anas platyrhynchos) during water landings
… landing kinematics. 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 …
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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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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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Taxonomic, ecological and quantitative examination of chewing lice (Insecta: Phthiraptera) on Canada geese (Branta canadensis) and mallards (Anas platyrhynchos) in Manitoba, Canada
… 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 of …
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Seasonal population levels, breeding and hunting of waterfowl on the New River, Virginia
… and March and lowest in the summer months. Mallards were sighted more frequently than any other species, followed by the wood duck and the black duck. The most abundant diving ducks were scaup, bufflehead and common goldeneye. Peak numbers of waterfowl were sighted during December; the …
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Soil ingestion and lead concentration in wildlife species
… by 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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Effects of Two Haying Provisions on Duck Nesting in Conservation Reserve Program (CRP) Fields in South Dakota
… idled strips and idled fields were primarily of mallards (Anas platyrhynchos), nests in hayed strips were primarily of blue-winged teal (Anas discors). In 1990 mean visual obstruction readings of residual and peak green growth vegetation were significantly greater (P50.05) in idled blocks than …
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Nesting Chronology of South Dakota Ducks
… brood age 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 …
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Stopover duration and habitat use of spring-migrating dabbling ducks in the Wabash River Valley, USA
… of 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 …
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Effects of food on bald eagle distribution and abundance on the northern Chesapeake Bay: an experimental approach
… were offered. We also paired gizzard shad with mallards (Anas platyrhynchos) and rabbits (eastern cottontails, Sylvilagus floridanus, or domestic rabbits, Oryctolagus cuniculus) in shoreline trials, and gizzard shad with mallards and eastern gray squirrels (Sciurus carolinensis) in captive eagle …
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MALLARD NESTING ECOLOGY IN THE GREAT LAKES
… as part of the Great Lakes Mallard Study, 536 mallards were radio-marked at nine sites in four states (Michigan, Ohio, Wisconsin, and Indiana). I tested a set of a priori candidate models to evaluate the relative influence of habitat variables on survival rate of mallard nests (DSR) at local …
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MALLARD NESTING ECOLOGY IN THE GREAT LAKES
… as part of the Great Lakes Mallard Study, 536 mallards were radio-marked at nine sites in four states (Michigan, Ohio, Wisconsin, and Indiana). I tested a set of a priori candidate models to evaluate the relative influence of habitat variables on survival rate of mallard nests (DSR) at local …
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Northern pintail nest site selection, nest success, renesting ecology and survival in the intensively farmed prairies of southern Saskatchewan: an evaluation of the ecological trap hypothesis
… were located in edge and grassland habitats. Mallards nested in habitats with dense cover in greater proportion to their availability and avoided crop stubble. Nest success estimates in crop stubble were lower (<1-4% vs. 6-37%) than the surrounding habitats with greater cover. Nest success …
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Environmental Factors Influencing Spring Migration Chronology of Lesser Scaup (Aythya affinis)
… Migration chronology of lesser scaup and mallards differed suggesting surveys designed for mallard migration may be biased for scaup. My thesis provides insight into how environmental factors and annual variation in weather influences scaup migration chronology, and could be used to …
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Nicarbazin for contraception of Canada geese: laboratory and field studies
… three laboratory studies using domestic mallards (Anas platyrhynchos) as a model for Canada geese to determine effect of NCZ on waterfowl reproduction. In the first study, mallards were given gelatin capsules containing 0, 8.5, 17.0, or 33.75 mg/kg body weight NCZ perorally once daily for …
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Factors Influencing Habitat Use By Breeding Waterfowl in South Dakota
… had highest 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 …
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Waterfowl Production On Three Types of Artificial Nesting Structures in South Dakota Wetlands
… years combined. Primary nesting species were mallards (Ana platyrhynchos), redhead (Aythya americana), and giant Canada geese (Branta Canadensis). Occupancy rates averaged 24.0%, 45.7%, and 15.0% for baskets, bales, and culverts, respectively. Nesting success averaged 69.5%, 35.8% and 66.7% …
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FORAGING BEHAVIOR OF DUCKS DURING SPRING MIGRATION IN THE WABASH RIVER REGION, ILLINOIS
… for a greater food reward (food treatment). Mallards, lesser scaup, and wood ducks exhibited risk-taking behavior consistent with perceived predation risk. Mallards devoted more time to feeding and used longer feeding stints when in areas with less cover. Alternatively, lesser scaup devoted …
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