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 20 of 281 for “"brood"”.
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Waterfowl Pair and Brood Use of Dug brood Complexes in East-Central South Dakota
… type of excavation in wetland basins is the dug brood complex; an interconnected system of pond units, channels, and islands, primarily created to provide waterfowl brood rearing habitat during drought. In 1981-82, a study was conducted to evaluate waterfowl pair and brood use of 8 pairs of Class …
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Acoustic manipulation by brood-parasitic honeyguide
Brood-parasitic birds lay their eggs in the nests of other species (‘hosts'), and their chicks encounter the challenge of acquiring sufficient food from host parents. Many parasitic chicks require more food than host chicks, and so need to elicit high rates of provisioning through their begging …
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Brood ecology and population dynamics of King Eiders
… of nest success. To gain insight into King Eider brood ecology I, respectively, 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 …
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Maternal Effects on Brood Reduction in Common Grackles
… their productivity in the long term by adjusting brood size to food availability in the short term. Consequently, future research regarding the adaptive allocation of maternal effects in common grackles should focus on identifying the strategies of mothers in the short term that may increase their …
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Coevolution between brood-parasitic honeyguides and their hosts
Obligate brood parasites lay their eggs in the nests of other species, foisting the costs of parental care onto the host parents. The success of the parasite and host are then at odds, with both parties evolving defences and countermeasures in an evolutionary arms race. This reciprocal influence of …
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Host recognition and fitness costs of avian brood parasitism
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Movements and Habitat Use By Hen Pheasants During Brood Rearing
… obtained on movements and cover preferences for brood rearing. Most studies of the type of cover utilized by pheasant broods have been based on roadside and random field observations. Kozicky and Hendrickson (1951) carried out studies of the type of cover used by broods in Iowa. Hammer (1965) in …
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Offspring retrieval behaviors after brood loss in the convict cichlid
… young in response to complete or catastrophic brood loss. This retrieval behavior is important for both parents because parents, especially the males, have been observed to abandon their mate and brood when it does not appear to be successful. </p> <p>Because brood loss in a natural setting …
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Frontline interactions between avian interspecific brood parasites and their hosts
… and evolution of the interactions between avian brood parasites and their hosts. Evidence of coevolution, reciprocal evolution, between avian interspecific brood parasites and hosts is evident at all stages of the host nesting cycle. The first chapter of this thesis presents a broad literature …
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Frontline interactions between avian interspecific brood parasites and their hosts
… and evolution of the interactions between avian brood parasites and their hosts. Evidence of coevolution, reciprocal evolution, between avian interspecific brood parasites and hosts is evident at all stages of the host nesting cycle. The first chapter of this thesis presents a broad literature …
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Costs and benefits of host use by brood parasitic birds
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Factors Affecting Waterfowl Brood Use of Stock Ponds in South Dakota
A July waterfowl brood survey was conducted from 1973 to 1976 on stock ponds located within four physiographic strata in South Dakota. Information was collected on weather, stock pond characteristics, land use and the condition of other wetlands located within the quarter section (64.8 ha) study …
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Avian brood parasitism as a model system for studying multispecies interactions
The relationships between avian brood parasites and their hosts are widely recognised as model systems for studying coevolution. Through the examination of tractable interactions between one species of brood parasite and one species of host, important insights have been gained on the processes that …
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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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Brood-rearing Period Cover Use By Wild Turkey Hens in Southcentral South Dakota
Brood-rearing period cover use by wild turkey (Meleagris gallopavo) hens with broods and those without, in Gregory County, South Dakota, was determined in order to formulate management suggestions for grassland/riparian woodland habitat. Two hens with broods and 12 hens without broods were studies …
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Aquatic Plant Communities and Invertebrates in a Prairie Pothole During Duck Brood Rearing
… Sampling was done weekly throughout the duck brood rearing season. Linear regression revealed a 4 to 100 ratio of animal to plant biomass (R²=0.488). Comparatively high degrees of association were found between Ceratophyllum demersum and Gastropoda and between Lemna minor and most zooplankton …
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Nesting aggregation as a Determinant of Brood Parasitism in Mason Bees (Osmia spp.)
… systems and are vulnerable to exploitation by brood parasites, such as kleptoparasitic wasps. High levels of nesting density have the potential to increase rates of brood parasitism by attracting larger numbers of parasites to areas with aggregations of nests. I conducted a field study in …
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Coevolutionary causes and consequences of high-fidelity mimicry by a specialist brood parasite
… is particularly evident in avian interspecific brood parasites, which are birds that lay their eggs in the nests of other species, or ‘hosts'. A possible rare example of a “perfect mimic” is the African cuckoo Cuculus gularis (a specialist parasite of fork-tailed drongos Dicrurus adsimilis) …
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Evaluation of a Power Plant Reservoir As A Holding Area For Paddlefish Brood Stock
… the reservoir as a holding area for paddlefish brood stock. Paddlefish captured during the first year after their release into the boiler make-up reservoir averaged 2.2 kg body weight increases and 59 mm eye-fork length increases. Condition factors of captured paddlefish also increased during …
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Influence of Weather On Movement and Habitat Use of Hen Pheasants During Brood Rearing
… habitat use and movement of hen pheasants during brood-rearing were studied by Hanson (1971). Survival of broods may have as much influence on pheasant population as hatching success (Trautman and Dahlgren 1965). Since little is known about the influence of daily weather variations on hens during …
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