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 106 for “"Nestling"”.
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Variation in mass and wing loading of nestling American Kestrels: possible effects of nestling behavior and adult provisioning behavior
… (i.e. aerial insectivores), it is important that nestlings not gain excess weight. Nestlings in some species must attain an efficient wing loading just prior to fledging to facilitate mobility for hunting and evading predators. My objective was to examine the mass of nestling American Kestrels …
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Factors influencing pre-fledging mass recession of nestling Tree Swallows
… contributing to pre-fledging mass recession by nestling Tree Swallows (Tachycineta bicolor). My study was conducted during the 2015 breeding season at the Blue Grass Army Depot in Madison County, Kentucky. Nestling Tree Swallows (n = 127) in 29 broods were divided into half-weighted (n = 32), …
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Determinants and Developmental Consequences of Organic Contaminant Uptake in Nestling Insectivorous Birds
… and their metabolites on wildlife with passerine nestlings as model organisms. For organisms at higher trophic levels, especially terrestrial ones the major route of exposure to persistent pollutants is food. Consequently, I estimated the diet of nestlings of populations of three species - tree …
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Facultative adjustment of pre-fledging mass recession by nestling Chimney Swifts (Chaetura pelagica)
… mass recession is a crucial aspect of the nestling period, ensuring fledglings will have an appropriate wing loading. My objectives were to determine if mass recession by Chimney Swift <em>(Chaetura pelagica)</em> nestlings is intrinsically controlled or facultatively adjusted by nestlings, …
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Perceived Predation Risk And The Responses Of Adult And Nestling Tree Swallows (tachycineta Bicolor)
… are functionally referential and provide their nestlings with information about the level of threat predators may pose. Although several investigators have examined the responses of nestlings of species with open-cup nests to the anti-predator calls of adults, few have conducted such studies …
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Avian nest predation: relationships with landscape characteristics and influences on adult and nestling behavior.
… risk influence the timing of nest departure in nestling birds. Regarding my first question, I found that predation by different predator species was influenced by different land cover types surrounding nests, but the direction and strength of relationships often varied among scales and …
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Effect of nestling sex ratio on the provisioning behavior of adult Eastern Bluebirds (Sialia sialis)
… differed in the number of male and female nestlings (N = 9), I found no effect of brood sex ratio on provisioning rates (P = 0.34). </p> <p>Female bluebirds provisioned nestlings at higher rates than males (P = 0.0046) and the provisioning rates of adult bluebirds varied with brood size (P …
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Ultraviolet reflectance of nestling plumage and the provisioning strategies of adult Eastern Phoebes (Sayornis phoebe)
… The lower breast and belly plumage of nestling Eastern Phoebes (<em>Sayornis phoebe</em>) reflects in the UV and adults may use variation in this reflectance to evaluate nestling quality and vary their provisioning behavior accordingly. To examine this possibility, I manipulated UV …
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The influence of temperature on parental investiment in Common Fiscal and consequences for nestling growth
… has a negative effect on daily mass gain in the nestlings of Common Fiscal (Lanius collaris) breeding in the southern Kalahari. This effect may be driven by parents modifying their provisioning rates at high temperature, but the mechanisms underpinning the relationship are not known. I …
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How does temperature affect Fork-tailed Drongo, Dicrurus adsimilis, foraging effort, nestling provisioning and growth rates?
… provided. Additionally, I aimed to identify how nestling growth rates change with temperature. The results of two supplemental feeding experiments indicated that as temperatures increased, adults significantly reduced their willingness to forage, reduced provisioning to offspring and exhibited …
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The influence of vulture restaurants on breeding success and nestling body condition of Gyps vulture populations across southern Africa
… such a relationship for Cape Vultures (p> 0.05). Nestling body condition of African White-backed Vultures was also not influenced by proximity to vulture restaurants (p> 0.05). Findings of this study provide motivation on the use of vulture restaurants as a conservation strategy across southern …
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Effect of variation in nestling hunger levels on the begging behavior of nestlings and the provisioning behavior of adult American Kestrels
<p>Little is known about how variation in nestling begging intensity influences the behavior of adult raptors and how responses of adult males and females to such variation might differ. My objective was to manipulate the begging intensity of nestling American Kestrels (Falco sparverius) and …
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Parent-Offspring Conflict and the Allocation of Parental Investment in the Feral Pigeon (Columba Livia) (Nestling Growth, Concorde Fallacy, Food Limitation)
Feral pigeons (Columba livia) increased feeding of offspring in response to playback of recorded begging calls. Parent-offspring conflict can account for these results, if parents cease responding to offspring demands when costs of investment are relatively high. This hypothesis was tested by …
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Effects of Variation in Hunger Levels on Begging Behavior of Nestlings and the Provsioning Behavior of Male and Female Eastern Phoebes
<p>Nestling birds solicit food from their parents using conspicuous vocalizations and visual begging displays and there is considerable empirical evidence suggesting that nestling begging represents honest signals of need, and that adults use these signals to determine provisioning rates. Less is …
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Nestling Diet, Quality, and Post-fledging Survival: Comparing Two Species of Aerial Insectivores in a Gradient of Agricultural Intensity in Saskatchewan, Canada
… been implicated in their decline. The quality of nestling nutrition mediated by parental selection of insect prey types (aquatic versus terrestrial) can be an important determinant of offspring health and development which, in turn, can have lasting effects on future life-stages, including the …
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Incubation temperature impacts growth, physiology and survival in nestlings of an open-cup nesting passerine
… incubation temperature influences variation in nestling growth and physiological development as well as survival may be of critical importance to bird conservation. I examined how variation in incubation temperature influences key aspects of nestling development in American robins (Turdus …
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Family Conflicts over Parental Care in the Blue Tit, Cyanistes caerleus.
… caeruleus. Experimental work mid-way through the nestling period investigates how nestlings solicit parental care through begging, and the food allocation rules of male and female parents. Nestling begging was found to relate to short-term hunger, but contrary to expectation, small nestlings did …
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Niche segregation among three sympatric species of swallows in southern Ontario
… potential interspecific differences in nestling diet and post-fledging movements. Using DNA barcoding of nestling feces and stable isotope analysis (δ13C, δ15N, δ2H) of nestling feathers, I found evidence of differences in dietary sources of provisioned young. Barn Swallows showed …
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Passerine Exposure to Metal Contaminants from Oilsands Mining in the Athabasca Region of Northeastern Alberta, Canada
… in kidney, liver, and stomach contents of nestling tree swallows, and monitored tree swallow nest success and nestling growth. I identified insects fed to nestlings to understand the influence of diet on metal accumulation in tissues, and collected insects to assess metal levels in …
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