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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 65 for “"nest predation"”.
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Nest Predation by brown-headed cowbirds (Molothrus ater)
… output, if they cause unsuitable late-stage host nests to fail thereby stimulating the host to create another nest that they can parasitize. I tested key predictions of this ‘farming’ hypothesis for the brown-headed cowbird (Molothrus ater). I found evidence that cowbird attacks are not uncommon, …
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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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Managing wet grassland landscapes: impacts on predators and wader nest predation
… populations may be limited by high levels of predation of eggs and chicks. In this thesis, I assess the distribution of mammalian predators and their small mammal prey in a landscape managed for breeding waders within lowland wet grasslands, and use these findings to consider the potential for …
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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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A study of avian nest predation at Audubon Acres in Chattanooga, TN
Predation is believed to be the primary cause of nesting mortality among North American migratory land birds. High rates of nest predation can jeopardize avian reproductive biology by affecting life histories and habitat selection. Artificial nests are commonly used to study nest predation because …
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Reproductive Biology of Alligator Snapping Turtles: Behavior, Reproductive Investment, and Nest Predation
… interest. Specifically, I studied: (1) nesting behavior and (2) maternal reproductive investment patterns in a captive alligator snapping turtle population housed outdoors under semi-natural conditions, and (3) nest predation patterns in a reintroduced population. Both sites were located …
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Spatial ecology of Western Ratsnakes (Pantherophis obsoletus) : implications for bird nest predation
… forests, many birds face high rates of nest predation, to the point where this region may serve as a population sink for some species. That is, so many of their eggs and young are eaten by predators that these birds cannot produce enough offspring to replace themselves, rendering regions …
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Differential growth of body components among coexisting passerines in response to nest predation risk
… increases in time dependent mortality, like nest predation risk in birds, should favor growth of body features that enhance the ability to leave nests earlier. We studied 12 coexisting species of passerines to specifically test predictions that species with higher nest predation rates would …
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Differential growth of body components among coexisting passerines in response to nest predation risk
… increases in time dependent mortality, like nest predation risk in birds, should favor growth of body features that enhance the ability to leave nests earlier. We studied 12 coexisting species of passerines to specifically test predictions that species with higher nest predation rates would …
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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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Differential avian extinction from Barro Colorado Island, Panama: Nest predation and population genetic factors
On Barro Colorado Island (BCI), a 1500 ha forest preserve in Gatun Lake (part of the Panama Canal) that has been isolated form mainland forest for 75 years, eight species of birds in the terrestrial insectivore guild have gone extinct, one is declining, and 3 persist. I evaluated two alternative …
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An Experimental Study of Behavioral Responses to Nest Predation and Brood Parasitism in a Migratory Songbird
… by Brown-headed Cowbirds (Molothrus ater) and nest predation can greatly reduce reproductive success. I studied populations of Prothonotary Warblers (Protonotaria citrea) in a fragmented bottomland forest during 1993--2000 and conducted field experiments to determine if these birds respond to …
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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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The Spatial and Temporal Dispersion of Nests as an Adaptation to Food Exploitation and Nest Predation in The American Goldfinch
Made available in DSpace on 2014-12-14T16:11:15Z (GMT). No. of bitstreams: 1 7811269.pdf: 2993301 bytes, checksum: 042a5c404b8e7808b3e53d89f81d9edc (MD5) Previous issue date: 1978
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An experimental approach to assess the role of nest predation in the population dynamics of the sociable weaver (Philetairus socius)
Predation is a widespread population process that has been shown to affect the distribution, abundance and dynamics of populations in ecosystems. This is the first study that used an experimental approach to assess the effect of nest predation on the population dynamics of the sociable weaver …
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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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Mechanisms underlying population dynamics of a migratory songbird in a fragmented forest
… are generally considered edge effects (nest predation and cowbird brood parasitism), whereas others are attributed to fragment size and isolation (low pairing success, area sensitivity, unstable population sizes). I studied the impact of Brown-headed Cowbird (Molothrus ater) brood …
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Using Conditioned Food Aversion (CFA) to reduce Pied Crow (Corbus albus) predation of plover nests
Nest predation is one of the principle constraints on bird breeding success, accounting for 20 to 80% of all nest failures. It can be exacerbated by anthropogenic factors and the resultant increased predation pressure has caused the decline of numerous bird species worldwide. Identifying management …
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Does nest size constrain clutch size? A tropical-temperate test
… time. An untested hypothesis posits that higher nest predation in the tropics favors smaller nests thereby constraining clutch-size. We tested this hypothesis by conducting an experiment to test whether nest predation increases with nest size in a tropical forest. Furthermore, we studied north …
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