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Showing 1 to 17 of 17 for “"Falco sparverius"”.
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American Kestrels (Falco sparverius) may use tail-pumping to maintain balance
<p>When perched, several species of small falcons, including American Kestrels (Falco sparverius), often pump their tails, but the possible function of this behavior is unknown. My objective was to use observations and experiments to examine the possible function(s) of tail-pumping by American …
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Ecological studies on the American kestrel (Falco sparverius) in east-central Indiana
The American kestrel (Falco sparverius) population of both Harrison and Washington Townships, Delaware County, east-central Indiana, showed a decline from December, 1985 to March, 1986, stabilization, and then a rise in June and July, 1986. Surveys reflect a larger kestrel population in Harrison …
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Toxic effects of dietary methylmercury on immune system structure, function, and development in the American kestrel (Falco sparverius)
This dissertation summarizes three investigations in which immunosuppressive effects of environmentally relevant concentrations of dietary methylmercury (MeHg) were assessed in adult non-breeding male kestrels, female kestrels during egg laying, and nestling kestrels. Immunological endpoints …
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Reproductive Success of American Kestrels (<em>Falco sparverius</em>) Nesting in Boxes along an Interstate in Northeastern Tennessee.
… nest sites for American Kestrels, <em>Falco sparverius</em>. When the availability of nest sites is a limiting factor, the addition of nest boxes can increase local breeding populations. These programs also facilitate the collection of data on breeding kestrels.</p><p>This study focuses …
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Survey of Reproduction of the Southeastern American Kestrel (Falco Sparverius Paulus) in Electrical Transmission Towers in South-Central Georgia
… southeastern subspecies of the American kestrel, Falco sparverius paulus, which was found to be breeding in the hollow cross-arms of the 230 kV electrical transmission towers between the Offerman substation in the east, to Plant Mitchell (Putney), in the west, in south-central Georgia. This …
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Vocalizations Of Adult American Kestrels (falco Sparverius): Effect Of Breeding Stage, Sex, And Context On Call Use And Characteristics
<p>American Kestrels (Falco sparverius) are small falcons with a vocal repertoire known to consist of three different vocalizations: whine, chitter, and klee calls. However, the characteristics and contextual use of these calls have not been quantified. To determine the characteristics of these …
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Reproductive Success of Southeastern American Kestrels (Falco Sparverius Paulus) Nesting in 230Kv Transmission Towers and Alternative Nest Structures in South-Central Georgia
… southeastern subspecies of the American Kestrel (Falco sparverius paulus). Numbers of Southeastern American Kestrels are estimated to have declined by more than 80% over the last fifty years in the southeastern United States. In Georgia, populations have nearly disappeared below the Fall Line. The …
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Use of Eastern South Dakota Shelterbelts By Nesting Birds of Prey
… Species observed were the American kestrel (Falco sparverius), Swainson’s hawk (Butwo Swainsoni), red-tailed hawk (Buteo jamaicensis), great horned owl (Bubo virginianus) and screech owl (Otus asio). Density figures for 1979 and 1980 were 0.60 and 0.65 birds/km², respectively. IN 1979, 12 …
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The Impact of Wind Turbines on the Distribution of Wintering and Migrating Raptors
… Owl (Bubo scandiacus), or American Kestrel (Falco sparverius) – changed their distributions in response to wind turbines. Similarly, we found no evidence of changes in the distributions of different age classes of Bald Eagle in response to wind turbines. Changes in overall population sizes on …
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Perceived Predation Risk And The Responses Of Adult And Nestling Tree Swallows (tachycineta Bicolor)
… striatus), a study skin of an American Kestrel (Falco sparverius), and a rubber model of a black rat snake (Pantherophis obsoletus), as well as a study skin of an American Robin (Turdus migratorius) used as a control. Experiments began at nests when nestlings were 12 or 13 days old. To assess …
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Vocal responses of Blue Jays (Cyanocitta cristata) to raptors that differ in predatory threat
… in my experiments, including American Kestrels (Falco sparverius), Cooper’s Hawks (Accipiter cooperii), Red-tailed Hawks (Buteo jamaicensis), and Great Horned Owls (Bubo virginianus), pose lesser threats. Although Blue Jays in my study did respond differently to different predators, their vocal …
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Biology and conservation of the endangered Bahama Swallow (Tachycineta cyaneoviridis)
… competition for cavities with American Kestrels (Falco sparverius), and non-native House Sparrows (Passer domesticus) and European Starlings (Sturnus vulgaris). These results highlight the importance of pine forest and the Hairy Woodpecker for the persistence of the swallow.
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Variation in mass and wing loading of nestling American Kestrels: possible effects of nestling behavior and adult provisioning behavior
… examine the mass of nestling American Kestrels (Falco sparverius) during the mid- to late nestling period and specifically to determine the possible effects of attaching small lead weights (3gm and 6gm) to some nestlings. If wing loading at fledging is important for nestling kestrels, then the …
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Vocal responses of adult Eastern Bluebirds (Sialia sialis) to potential nest predators and the behavioral responses of nestlings
… a study skin of an American Kestrel <em>(Falco sparverius)</em>, and a rubber model of a black rat snake <em>(Pantherophis obsoletus)</em>. My control was a study skin of a Mourning Dove <em>(Zenaida macroura)</em>. To assess responses during 3-min trials, predators or the control were …
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Factors Associated with Space Use and Reproductive Success of American Kestrels in Northern Virginia, USA
… evaluated the space use of American kestrels (Falco sparverius), a species of conservation concern, and tested whether their movement behavior was associated with sex-specific parental roles, local resource availability, and central-place foraging theory as a framework for linking movement to …
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Effect of variation in nestling hunger levels on the begging behavior of nestlings and the provisioning behavior of adult American Kestrels
… begging intensity of nestling American Kestrels (Falco sparverius) and examine the responses of adult males and females. I studied 12 pairs of kestrels nesting in nest boxes from 1 March to 1 July 2014 at the Blue Grass Army Depot, Madison County, Kentucky. Nest boxes were modified with a separate …