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.
Results
Showing 1 to 16 of 16 for “"Nest Predator"”.
-
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 …
-
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 …
-
Theory and Pattern of Life-History Evolution in Passerine Birds
… (resource effects), total breeding failure (nest predator effects), adult non-reproductive mortality, and adult reproductive risk. Variation in annual adult survivorship, clutch size, mating systems, and nest structure were predicted from the combined effects of various mortality factors.
-
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 …
-
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 …
-
Managing wet grassland landscapes: impacts on predators and wader nest predation
… 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 habitat management to reduce levels of nest predation for lapwing, Vanellus …
-
Nesting Success of Dickcissel (Spiza americana) and Non-breeding Grassland Bird Use of Northwest Arkansas’ Remnant and Restored Tallgrass Prairies
… grassland species are present at these sites, nesting success and non-breeding use are still largely unknown. Both life history aspects are required for effective grassland bird conservation. My first objective was to access nest success of the Dickcissel (Spiza americana) at two remnant and …
-
Vocal mimicry in the brown thornbill
… but its function is often unknown. Although anti-predator functions for mimetic alarm calls have been suggested, these are yet to be tested. In this thesis I formally evaluated claims of vocal mimicry in the brown thornbill (Acanthiza pusilla) and tested if mimetic vocalisations function in …
-
Vocal mimicry in the brown thornbill
… but its function is often unknown. Although anti-predator functions for mimetic alarm calls have been suggested, these are yet to be tested. In this thesis I formally evaluated claims of vocal mimicry in the brown thornbill (Acanthiza pusilla) and tested if mimetic vocalisations function in …
-
An experimental approach to assess the role of nest predation in the population dynamics of the sociable weaver (Philetairus socius)
… an experimental approach to assess the effect of nest predation on the population dynamics of the sociable weaver (Philetairus socius), a keystone species in the semi-arid savannas of the Kalahari and Namib regions. Snakes were excluded from five colonies for five breeding seasons and two colonies …
-
Foraging in space and time
… Individuals were either exposed to different predator types (airborne or 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. …
-
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 …
-
Behavioral ecology of wild turkeys
… season, sensitive to observer presence near the nest site, and as a result our understanding of their incubation behavior is limited to a handful of studies. Lacking this important behavioral information, it remains unclear how incubation behavior among turkey hens influences reproductive …
-
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 …
-
Impacts of non-renewable resource extraction on shrubland songbird nest success and abundance
… I focus on habitat selection patterns and nesting ecology of one species, the Blue-winged Warbler (Vermivora cyanoptera). This species has not been studied much outside of its antagonistic relationship to the closely related and highly imperiled Golden-winged Warbler (Vermivora …
-
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 …