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Showing 1 to 20 of 96 for “"ducks"”.
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Nesting Chronology of South Dakota Ducks
Duck broods were censused on 476 randomly selected plots in South Dakota during July of the years 1973 through 1976. Broods were also censused on wetlands located off the study plots both in July and August of these years, except in 1976 when no August counts were made. Hatching and nest initiation …
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Hematoza of Wood Ducks (Aix Sponsa) in Missouri
A total of 317 wood ducks (Aix sponsa) from two localities in Missouri was examined for hematozoa in 1989 and 1990. Thirty seven (9.97%) harbored one or more blood parasites. Haemoproteus nettionis was the most common parasite, occurring in 36 (9.70%) of the birds. Leucocytozoon simondi was found …
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Drivers of Productivity of Montane and Boreal Breeding Ducks
… near Yellowknife, Northwest Territories, Canada. Ducks breeding at these sites have been studied for periods of 9 (RRL, scaup) to 26 (YKSA, multiple boreal duck species) years. I used age-corrected body masses of 5727 scaup ducklings at RRL and 26 years of annual duck pair and brood abundance …
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Some Immunological and Histological Characteristics of Virus Hepatitis of Ducks
Made available in DSpace on 2015-05-12T17:14:37Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0023332.PDF: 5511672 bytes, checksum: c8ddf83de10588675444f69f8d68756d (MD5) Previous issue date: 1957
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Some Immunological and Histological Characteristics of Virus Hepatitis of Ducks
Made available in DSpace on 2014-12-05T23:14:06Z (GMT). No. of bitstreams: 1 0023332.pdf: 5511672 bytes, checksum: c8ddf83de10588675444f69f8d68756d (MD5) Previous issue date: 1957
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Ecology of fall-migrating ducks in central Illinois: a radar perspective
… importance of migration in the annual cycle of ducks, but many aspects of migration ecology remain poorly understood due to the difficulty of investigating movements that occur over large spatial scales, at substantial heights and at night. Weather surveillance radar (WSR) offers a unique tool …
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Population ecology of wood ducks in Nevada under experimental manipulation of harvest
… manipulated harvest regulations for wood ducks in Nevada, to study how harvest affects population level change in abundance and the mortality process. Additionally, I assessed how variation among individuals affects the mortality and recruitment processes. Harvest regulations are used to …
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Characteristics of Wetlands Used by Breeding Diving Ducks in Eastern South Dakota
… the distribution and habitats of diving ducks in eastern South Dakota. Redheads (Aythya americana) and ruddy ducks (Oxyurajamaicensis) were the primary breeding species of diving ducks in eastern South Dakota in 1995 and 1996. Canvasback (Aythya valisineria) and lesser scaup (Aythya …
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Movements and Habitats of Brood-Rearing Wood Ducks On A Prairie River
Radio telemetry and brood surveys were used to evaluate wood duck (Aix sponsa) brood habitat and movements along 40 km of the Big Sioux River in eastern South Dakota during 1979-81. Most of the oxbows and nearby wetlands in the study area contained water in 1979-80, but drought dried all but 2 of …
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Using stable isotopes to trace the movements of ducks in southern Africa
… stable isotope technique to trace movements of ducks in southern Africa. I sampled and analysed feathers of ten duck species for stable isotope proportions of Carbon (δ13C), Nitrogen (δ15N) and Hydrogen (δD), from five wetlands (Strandfontein and Barberspan in South Africa, the Manyame catchment …
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Habitat use and energetics of American black ducks wintering at Chincoteague, Virginia
The habitat use and energetics of American black ducks (Anas rubripes) wintering at Chincoteague National Wildlife Refuge, Virginia, were investigated. Twenty-two female black ducks were systematically radiotracked on the 25,600 ha study area between 15 December 1985 and 28 February 1986. Diurnal …
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FORAGING BEHAVIOR OF DUCKS DURING SPRING MIGRATION IN THE WABASH RIVER REGION, ILLINOIS
… the system. I used a guild of spring migratory ducks as a model system and manipulated food abundance in areas differing in presumed risk to assess the relative effects of food abundance, predation risk, competition, and life history characteristics on foraging strategies used by ducks. Using a …
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Use of Waterfowl Production Areas by Ducks and Coots in Eastern South Dakota
… (WPA) by American coots (Fulica americana) and ducks was studied during 1970 and 1971 in east-central South Dakota The Eriksrud WPA, a type IV wetland with 55 acres of water area and 35 acres of upland, contained 188 coot nests during the 2-year study. Of the 188 coot nests, 178 hatched for a …
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Bioenergetics of Black-Bellied Tree Ducks in Relation to Their Growth and Distribution
Made available in DSpace on 2014-12-12T01:27:40Z (GMT). No. of bitstreams: 1 7317140.pdf: 2005694 bytes, checksum: dc528cf9b960060425133e215985f426 (MD5) Previous issue date: 1972
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Total evidence phylogeny of ducks, geese and swans(family Anatidae): implications for macroevolution andbiogeography
… neornithine bird family Anatidae comprises the ducks, geese and swans, and is one of the largest (approximately 150 species) and most studied families of modern birds. The fossil record of definitive anatids stretches from the Oligocene epoch to thepresent. However, the phylogeny of this family …
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Effects of dietary melamine and cyanuric acid in young Pekin ducks and weanling pigs
… conducted. Two experiments involved young Pekin ducks while the other involved weanling barrows fed contaminated diets for 21 consecutive days. Results indicate that [greater than or equal to] 1.00% MEL is needed to cause reduced performance in Pekin ducks and decreased body weight gain in …
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