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 10 of 10 for “"nestling provisioning"”.
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How does temperature affect Fork-tailed Drongo, Dicrurus adsimilis, foraging effort, nestling provisioning and growth rates?
… affect their behaviour, including foraging and provisioning of young, thereby reducing reproductive success. However, it remains unclear whether this results from physiological constraints on behaviour, from declining food availability and or access to prey items at high temperatures. In this …
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Parental Investment and Male Ornamentation in the Eastern Bluebird (Sialis Sialis)
… is usually measured as the rate at which nestlings are provisioned. However there are other forms of parental investment. The purpose of this study is to quantify the relationship between two measures of parental investment and their association with structural plumage coloration in male …
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Ultimate and Proximate Explanations of Helping Behavior in the Red-cockaded Woodpecker (Picoides borealis)
… that breeders spend less time incubating and provisioning young when a helper is present. Helpers may also gain fitness benefits if once they become breeders, they are assisted by young they previously helped raise. Expected frequencies of reciprocal exchange of helping are low (2%). Slightly …
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Dominance, social organisation and cooperation in the sociable weaver (Philetairus socius)
… individual cooperativeness to three tasks, nestling provisioning, nest construction and predator mobbing. I find that both explain variation in cooperativeness, yet some results follow opposite directions, revealing multiple routes to cooperation. Finally, in Chapter 6, I examine how …
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THE ROLES OF FOOD AND PREDATION IN SHAPING ADAPTIVE AND MALADAPTIVE BEHAVIORS IN POSTFIRE BIRD SPECIES
… nest sites with the most moderate microclimates. Nestlings reared in colder nest sites gained mass more slowly and experienced retarded skeletal growth while parents suffered costs associated with hot microclimates; incubating females reduced their nest attentiveness and doubled their nestling …
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THE ROLES OF FOOD AND PREDATION IN SHAPING ADAPTIVE AND MALADAPTIVE BEHAVIORS IN POSTFIRE BIRD SPECIES
… nest sites with the most moderate microclimates. Nestlings reared in colder nest sites gained mass more slowly and experienced retarded skeletal growth while parents suffered costs associated with hot microclimates; incubating females reduced their nest attentiveness and doubled their nestling …
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An integrative approach to testing density effects in a migratory songbird, the Prothonotary Warbler (Protonotaria citrea)
… year, I estimated warbler reproductive output, nestling provisioning rates, and nestling body condition prior to fledging to test for effects of density on the annual fecundity of warblers. My results suggested that warbler annual fecundity was unaffected by local conspecific densities. Warbler …
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Going through the motions : the impacts of frequent fires and grazing pressure on reproduction of Montane grassland birds
… food abundance on feeding rate, nestling provisioning rates, nestling growth rates, body condition, nest attentiveness and brooding effort. My results suggest that the food availability alone may not be the most important factor influencing the production of offspring. Instead, …
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Effect of nestling sex ratio on the provisioning behavior of adult Eastern Bluebirds (Sialia sialis)
… sex-biased parental investment. Preferential provisioning behavior has been reported in one population of Eastern Bluebirds (<em>Sialia sialis</italic>) and attributed to local resource competition. To better understand this behavior, I studied the provisioning behavior of Eastern Bluebirds in …
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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 …