Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"duckling"”.
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The feasibility of commercial duckling production in Kansas
Digitized by Kansas Correctional Industries
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Fathead Minnows, Aquatic Invertebrates, and Mallard Duckling Interactions in Man-Made Ponds
… fishless wetlands may negetatively affect duckling growth and survival. In 1991, 5 pairs of ponds (cells) were used to test what effect minnows had on the invertebrate population and duckling growth. Fathead minnows were stocked in half of the cells. Mallard ducklings were placed on both …
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Genetic study of hematopoiesis development by two zebrafish mutants: Ugly duckling and tc-244
… In this study, two zebrafish mutants ugly duckling (udu) and tc-244 were used to study the development of primitive and definitive hematopoiesis. Characterization and transplantation analysis of udu mutant suggests that the udu gene is essential for the primitive hematopoietic cell …
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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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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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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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Wood Duck Brood Movements, Habitat Use, and Survival Rates on Two Prairie Rivers in South Dakota
… or semipermanent wetlands. Brood survival (≥1 duckling reared to 30 days) was higher (P=0.04) on the Big Sioux River than on the Maple River. Duckling survival did not differ among areas or years. Initial brood size (P=0.0002) and the date of nest exodus (P=0.003) were inversely related to …
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Population ecology of wood ducks in Nevada under experimental manipulation of harvest
… rates). In duck species, the probability of duckling survival is an important component of recruitment into the breeding population. In chapter four I investigated how variation in maternal investment in offspring by nesting female wood ducks affected duckling mortality (1-survival) to 60 …
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Brood ecology and population dynamics of King Eiders
… or their components, e.g., nest success, duckling survival. Isotopic data suggested that female King Eiders were not strongly philopatric to wintering areas between years. Individuals that wintered in western seas initiated nests earlier and had slightly larger clutch sizes during early …
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MALLARD NESTING ECOLOGY IN THE GREAT LAKES
… sensitive to changes in nest success (16%) and duckling survival (32%). In spring of 2001 to 2003, 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 …
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MALLARD NESTING ECOLOGY IN THE GREAT LAKES
… sensitive to changes in nest success (16%) and duckling survival (32%). In spring of 2001 to 2003, 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 …
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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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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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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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Influence of Habitat Characteristics on Wetland Bird Abundance and Species Richness at Ordway Prairie, South Dakota
… and abundance of emergent vegetation in 1998. Duckling use of escape cover following a disturbance at a wetland was investigated. Generally, blue-winged teal and gadwall broods moved to open water when disturbed and mallard broods moved into upland cover.
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The Foraging Ecology, Habitat Use, and Population Dynamics of the Laysan teal (Anas laysanensis)
… population dynamics. Adult survival is high, but duckling survival on Laysan is low, and is a primary demographic parameter limiting population growth. Estimates indicate the population density was high (between 546-827) from 1991 until August 1993, prior to a population crash that occurred …
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The role of incubation temperature in determining avian phenotype: implications for avian ecology, life history evolution, and conservation
… C differences in incubation temperature affected duckling growth and body condition, stress endocrinology, immune responses, and energy expended to thermoregulate. Many of these effects persisted days to weeks after hatching. In most cases, ducklings that hatched from eggs incubated at lowest …
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Sounds without Borders: Industry, Society and the Voice in Giallo Cinema
… Chapter 2 analyses Lucio Fulci’s Don’t Torture a Duckling (1972) and Sergio Martino’s Torso (1973). Both films draw on longstanding Italian cultural stereotypes to pitch the silence of the rural against the vocality of the urban. The films use silence and the voice as ‘cartographic’ tools to …
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Generation and use of new tools for the characterisation of gut hormone receptors
… hormone, initially referred to as the ‘ugly duckling’ incretin hormone due to it’s ineffectiveness in inducing insulin secretion in type 2 diabetic patients. Aside from the incretin actions, GIP is thought to be involved in the regulation of high-fat diet (HFD) induced obesity. A new …