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Showing 1 to 20 of 22 for “"ducklings"”.
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Effects of Phorate on Ducklings, Macroinvertebrates, and Microtox in Northern Prairie Wetlands
… insecticide, on mallard (platyrbynchos) ducklings and aquatic macroinvertebrates was studied in littoral mesocosms in South Dakota wetlands. In 1991 and 1992, four mesocosms were constructed in each of three wetlands. In each wetland, one mesocosm was a reference and phorate …
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The Pathogenicity of Duck Hepatitis Virus for Duck Cell Cultures, Chickenembryos and Ducklings
Made available in DSpace on 2014-12-09T22:30:04Z (GMT). No. of bitstreams: 1 6500814.pdf: 4014156 bytes, checksum: 79fedf95640242ddf87f56b7c98729e1 (MD5) Previous issue date: 1964
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Availabilty of Potential Invertebrate Foods for Anatini Ducklings Above and Below the Water Surface of Eastern South Dakota Wetlands
… as potential foods for Anatini (dabbler) ducklings was explored during the summers of 1998 and 1999 in eastern South Dakota. Two study areas, the Oakwood Lakes complex and Mickelson Memorial Wetland, were chosen for this research during the summer of 1998. In 1999, a third area, Redetzke …
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The role of prenatal auditory stimulation in the development of filial behaviour in the domestic duckling
… call for which naive Peking X Aylesbury ducklings show the greatest natural preference. In each experiment SO ducklings were tested at 20 ± 2 hrs. posthatching, for following and approach responses to one of four auditory stimulus conditions or a silent model. The responsiveness of …
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Brood ecology and population dynamics of King Eiders
… monitored 111 and 46 individually-marked ducklings from broods of 23 and 11 radio-marked King Eiders during 2000 and 2001. Total brood loss accounted for 84% of all duckling mortality with most brood loss (77%) less than 2 days after hatch. Estimated apparent survival rates of ducklings to …
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Fathead Minnows, Aquatic Invertebrates, and Mallard Duckling Interactions in Man-Made Ponds
… 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 foods. …
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Pheasant Use and Waterfowl Production on State and Private Lands
… were successful on private areas and produced 66 ducklings, and 18 of 48 duck nests were successful on state areas and produced 151 ducklings in 1969. The difference between pheasant nesting success on state and private areas was significant. (P<.05) but no significant difference was found in …
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The role of incubation temperature in determining avian phenotype: implications for avian ecology, life history evolution, and conservation
… days to weeks after hatching. In most cases, ducklings that hatched from eggs incubated at lowest temperature performed poorer than ducklings that hatched from eggs incubated at the higher temperatures. Incubation temperature also affected wood duck embryonic developmental trajectories and …
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The Ability of Speaking Rate to Influence Infants' Preferences for Infant-Directed Speech
… Research using avian species has shown that ducklings, for example, prefer their species- specific maternal call only when it is presented at values close to the species-typical mean. These studies have shown that experience affects ducklings' preferences for rate in auditory events. …
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Movements, Survival, and Habitat Use of Mallard Broods Hatched from Predator Reduced Nesting Habitats in Eastern South Dakota
… areas often produce high numbers of hatched ducklings, however, the eventual fate of these ducklings is often poorly understood. The objectives of our study were: to determine movements of mallard (Anas platyrhynchos) broods from nest site to brood rearing wetlands, and thereafter; to …
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Breeding Ecology and Productivity of Mallards and Mallard-grey Duck Hybrids in New Zealand
… hatched more eggs per nest, and fledged more ducklings. Predicted fecundity suggested ASY and SY females recruited 0.25 and 0.36 female offspring into the breeding population, respectively. Model-predicted population growth rates suggested an annual decrease of 0.16 per year. Sensitivity …
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An Evaluation of the Effects of Climate Variability on the Size of Wild North American Duck Eggs from 1859-2010
… be affected because larger eggs result in larger ducklings which experience higher survival rates than smaller ducklings. The effect of past climate variability on North American duck species has not been addressed prior to this research. This study provides empirical baseline data on current, …
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Waterfowl Use and Production of Artificial Nesting Structures and Hay Bales in South Dakota
… 0% for ducks, 78. 4% for geese). Known number of ducklings produced per usable structure in water averaged 1. 4 on culverts, 0. 8 on baskets and 0. 6 on bales, while known number of ducklings produced per occupied structure averaged 6. 4 on culverts, 6. 1 on baskets and 2. 0 on bales. Known number …
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Drivers of Productivity of Montane and Boreal Breeding Ducks
… I used age-corrected body masses of 5727 scaup ducklings at RRL and 26 years of annual duck pair and brood abundance counts at YKSA to assess annual variation in duckling quality (RRL) and productivity (YKSA). Age-corrected scaup duckling body mass was lower in years of both early and late …
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Waterfowl Pair and Brood Use of Dug brood Complexes in East-Central South Dakota
… Edge area were important feeding areas for ducklings. Future evaluations of modified wetlands should include pre-modification and post-modification studies to better evaluate changes in waterfowl density, diversity and production.
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Population ecology of wood ducks in Nevada under experimental manipulation of harvest
… techniques. I used CMR data from 3,035 ducklings that were marked with uniquely coded webtags on the day of hatch over nine nesting seasons (2008-2016). Duckling mortality was greatest during the first week of life and approached zero by the second week after hatching. I observed a …
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Studies on the biology of Plagiorchis elegans (Rudolphi, 1802), (Trematoda: Digenea) in its mammalian and molluscan hosts
… rats, gerbils and hamsters) and birds(chicks, ducklings and pigeons) are susceptible to infection. Egg counts were performed to follow the course of the infection in mice and rats. Primary infections of LACA mice are of short duration as a result of a host immune response. By means of surgical …
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Consequences of avian parental incubation behavior for within-clutch variance in incubation temperature and offspring behavioral phenotypes
… temperatures lead to a reduced ability of ducklings to exit the nest cavity (Chapter 3), a more proactive behavioral phenotype (Chapter 4), a smaller body size, and a reduced efficiency in food consumption (Chapter 5), compared to those incubated at higher temperatures. Together, my …
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Synthetic studies on the spiroacetal moiety of stenocarpin, a metabolite of Diplodia maydis
… isolation of stenocarpin, a metabolite toxic to ducklings, from maize cultures of D. maydis as the 4,6-0-diacetate derivative and its structure elucidation has been reported in the literature. Detailed NMR studies established the structure as either (3S,4R,6R,7R)- or (3R,4R,6R,7R)-spiro[(4,6, …
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Survival, Movements, and Habitat Use of Mallard Broods Produced on Overwater Nesting Structures in Eastern South Dakota
… added in 1999. Eighty-six females and 58 day-old ducklings were radiomarked. Brood survival was high at Oakwood (71%), Mickelson (100%), and Redetzke (80%). Duckling survival was 0. 424 ± 0. 057 to 38 ± 18 �ays at Oakwood (years pooled), 0. 733 ± 0. 035 to 40. 5 ± 14.S days at Mickelson (years …
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