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 25 for “"nest predators"”.
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Vocal responses of adult Eastern Bluebirds (Sialia sialis) to potential nest predators and the behavioral responses of nestlings
… are functionally referential and may provide nestlings with information about the threat posed by potential predators. However, few investigators have examined the responses of nestlings in cavity nests to the anti-predator vocalizations of adults. Therefore, the objectives of my study of …
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Modeling and analysis of a three-species food web with facilitated and intraguild predation
… between two major loggerhead sea turtle nest predators, North American raccoons and Atlantic ghost crabs. Studies have also highlighted that ghost crab predation assists raccoons in finding nests (i.e., facilitated predation). However, the combined effects of these two intraguild …
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Aspects of Mammalian Predation on Upland Nesting Waterfowl in Central North Dakota
<p>The impact of mammalian predation on upland nesting waterfowl was studied in central- North Dakota during the summers of 1987 and 1988. Survival of artificial nests was examined in relation to nest density, vegetation cover, distance from roads, active predator dens, and other artificial nests …
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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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Exploiters and exploited: antagonism, mutualism and mimicry in an ecological community
… how drongos are exploited by cuckoos and nest predators, while simultaneously exploiting other heterospecifics into aiding them to defend their nest. Chapter 1 introduces the rationale of studying antagonism in a broader context. Chapter 2 integrates evidence from diverse antagonistic …
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An experimental analysis of nest predation in eastern deciduous forests
Nest predation exerts a major influence on the reproductive success of birds because it is the most important cause of nest loss. In this thesis, I studied how richness, density, and frequency of nests, and the fragmentation of forests through alterations of the landscape and forest structure …
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Habitat influences on avian diversity and reproductive success in western aspen forests
… density and structural complexity around nest sites or the addition of conifer-dependent nest predators. We examined the effects of conifer encroachment on the diversity and reproductive success of birds in fourteen aspen stands that differed in the extent of conifer encroachment in …
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Habitat influences on avian diversity and reproductive success in western aspen forests
… density and structural complexity around nest sites or the addition of conifer-dependent nest predators. We examined the effects of conifer encroachment on the diversity and reproductive success of birds in fourteen aspen stands that differed in the extent of conifer encroachment in …
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Nest predation and habitat selection in the grasshopper sparrow (Ammodramus savannarum)
Predation is the leading cause of nest failure for many birds and is an important source of natural selection that shapes avian behavior and life-history traits. However, our understanding of the relationship between habitat characteristics and nest loss and how predation affects nest-site …
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Post-breeding public information use in a ground-nesting songbird community
… are PI cues used by Veeries and other ground-nesting songbirds (i.e., Ovenbirds [Seiurus aurocapilla]) for territory establishment in subsequent breeding seasons. Moreover, I hypothesize that ground-nesters integrate multiple social cues sampled throughout the breeding season when selecting …
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Smallmouth bass mortality during parental care: implications for year-class strength
… relatively low and stable during spawning, and nest success was high (64%). Mortality (attrition) averaged 9.5% per day (range 5.2-13.9%) and 94.1% total (range 80.9-99.5%) for broods that survived to dispersal. Mean DMR for the interval from swim-up to larval metamorphosis (14.0%) was higher …
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Population Dynamics of Willow Flycatchers in the Sierra Nevada
… and brood parasitism rates, and meadow and nest-scale characteristics and, in turn, how these affected reproductive investment, fecundity, site fidelity, and potential for population growth. Flycatchers breeding in the central regions initiated nesting on average a week later than …
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Snakes as predators of bird nests: now and in a warming world
… evolutionary biology. For most species of birds, nest predation is the primary cause of nest failure and snakes have often been implicated as important nest predators. However, in other studies snakes are absent or infrequent predators. Here, I reviewed available nest camera studies from North …
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Vocalizations Of Adult American Kestrels (falco Sparverius): Effect Of Breeding Stage, Sex, And Context On Call Use And Characteristics
… (study skins) of conspecifics and potential nest predators (human). I found that the characteristics of vocalizations of males and females were similar, but the chitter calls of males were at a higher frequency than those of females. Sex and call context had significant effects on the use of …
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Habitat selection and breeding ecology of grassland birds in areas managed with fire and grazing
… diversity of grassland birds? and 2) how does nest-site selection relate to nest success in three grassland bird species, and what does this mean in the context of management? I found that reduced stocking rates on patch-burned sites increased pasture-level heterogeneity, leading to increased …
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Avian nest predation: relationships with landscape characteristics and influences on adult and nestling behavior.
Nest predation is the leading cause of reproductive failure in birds. As a result, many studies have sought to understand what factors influence nest predation as well as the ways in which birds respond to predation. However, identifying the factors that lead to variation in nest predation has …
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The Impacts of Corvids on Biodiversity
Corvids are often referred to as efficient nest predators with potential negative impacts on biodiversity. Despite the plethora of literature focusing on the impact of corvids on their potential prey, no review has been conducted on the genus Corvus to synthesis these relationships, and to explore …
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Foraging in space and time
… ground) or combinations of both, or to indirect predators (nest predators). Risk was assumed to be distributed homogeneously, so changing the habitat or temporal adaptations where not regarded as potential options. Results show that wild-caught voles have strategic answers to this homogeneously …
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Land use and breeding ecology of a renosterveld endemic bird: the Agulhas Long-billed Lark Certhilauda brevirostris
… contributors to biodiversity loss. Ground-nesting birds are especially vulnerable. Understanding the distribution and nesting requirements of a species is important, particularly if that species exists almost entirely within a human-modified landscape. The Agulhas Long-billed Lark …
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Assessing Changes in Bog Turtle (Glyptemys muhlenbergii) Population Abundance and Factors Influencing Nest Predation in Virginia
… success, numerous subsequent years of complete nesting failure can negatively impact population-level survival. Recent studies have suggested that anthropogenically subsidized nest predators may be playing a role in continued nest failure at certain wetlands. My second chapter investigated the …
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