Global ETD Search
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Showing 1 to 9 of 9 for “"Aerial insectivores"”.
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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
In the last decades, several species of avian aerial insectivores have experienced steep declines in different regions of North America, and no single driver has been identified. Given the common reliance of aerial insectivores on flying insects, changes in spatiotemporal availability of prey …
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Factors influencing pre-fledging mass recession of nestling Tree Swallows
<p>Fledglings of some aerial insectivores experience pre-fledgling mass recession, possibly to achieve an optimum wing loading by the time of fledging. However, studies of aerial insectivores to date have been limited to two species of swifts (Apodidae), and additional studies of species of aerial …
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The Role of Breeding Habitat Loss in the Decline of Eastern Whip-Poor-Will (Antrostomus Vociferus) Populations in Canada
… of birds that feed on flying insects (i.e., aerial insectivores) have been declining for several decades in North America, yet the cause of these declines is poorly understood. Among aerial insectivores, Eastern Whip-poor-will (Antrostomus vociferus; “Whip-poor-will”) populations have …
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The impact of edge-effects on aerial insectivorous bat assemblages in the Amazon
… and extent of edge effects on Amazonian aerial-insectivorous bats by relying on a suite of theoretical models previously applied to other taxa. Acoustic sampling was conducted across two seasons at the Biological Dynamics of Forest Fragments Project along four 2km transects consisting of …
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Facultative adjustment of pre-fledging mass recession by nestling Chimney Swifts (Chaetura pelagica)
… flight costs, particularly seabirds and aerial insectivores, 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 …
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Variation in mass and wing loading of nestling American Kestrels: possible effects of nestling behavior and adult provisioning behavior
… of maneuverability and speed is required (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 …
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Migratory connectivity and differential patterns of decline in Barn Swallow (Hirundo rustica) in North America: Potential effects of factors on breeding and wintering grounds
… in the recent decades but long-distance migrant aerial insectivores seem to be declining at greater rates than any other group. The Barn Swallow (Hirundo rustica) is a long-distance migrant and an aerial insectivore whose breeding populations have declined drastically in northern regions of North …
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Indirect effects of agricultural intensification on tree swallow (Tachycineta bicolor) foraging behaviour, body condition, and physiology
Throughout North America, many species of aerial insectivorous birds – birds that capture flying insects – have exhibited sharp declines, with tree swallows (Tachycineta bicolor) experiencing a 2.8% annual decline in Canada since 1989. The timing of these declines coincides with major changes in …