Tag: Falco sparverius

VOCAL DEVELOPMENT IN AMERICAN KESTREL (FALCO SPAR VERIUS) NESTLINGS

American Kestrel (Falco sparverius) Science Article 7 abstract We studied the acoustical characteristics of calls made by nestling American Kestrels (Falco sparverius). A total of 563 vocal samples was obtained from 88 chicks (49 males and 39 females) from 20 broods. Thirteen frequency, three numerical, and two temporal characteristics were measured using audio spectrography. Discriminant […]

The effects of temperature and artificial rain on the metabolism ofAmerican kestrels (Falco sparverius)

American Kestrel (Falco sparverius) Science Article 5 abstract The effect of rainfall on the metabolism of birds is poorly understood. We measured the metabolism as rate of oxygen consumption (V? O2)of four male and four female American kestrels (Falco sparverius) using open-circuit respirometry. We measured V? O2 during the spring atambient temperatures (Ta) of 5, […]

Carotenoid concentration and coloration of AmericanKestrels (Falco sparverius) disrupted by experimentalexposure to PCBs

American Kestrel (Falco sparverius) Science Article 6 abstract Bright coloration in birds is typically a sexually selected trait. Expression of suchtraits is sensitive to environmental factors, so they can function as bioindicators ofenvironmental contamination. Of particular value may be carotenoid-based colorationbecause it is commonly used as a social signal and these pigments have importanthealth functions. […]

American Kestrel Use of Pine Regeneration Stands in South Carolina

American Kestrel (Falco sparverius) Science Article 15 abstract The American Kestrel (Falco sparverius) is widely distributed across mostof the United States and is one of the most abundant of all North Americanraptors. Two subspecies of kestrels occur in the southeast, F. s. sparverius andthe rarer F. s. paulus. Amanda Allen Beheler and John B. Dunning, […]

Capture Rate of American Kestrel During NonbreedingSeason Influenced by Sex of Bird inUpstate South Carolina

American Kestrel (Falco sparverius) Science Article 9 abstract Assuming equal distribution of male and female American Kestrels (Falcosparverius) according to genetic frequency, a near equal capture rate might beanticipated (Cooke et al. 1987). Conversely, it is known that during the nestingseason males tend to provide most of the female’s energetic needs, so maleswould be more […]

Reverse mounting in the American Kestrel.

American Kestrel (Falco sparverius) Science Article 17 abstract Reverse mounting during mating has been reported in a number of avian orders (see James 1983 for review). Several authors imply that the behavior is aberrant (Ficken 1963, Nolan 1978, Thompson and Lanyon 1979), while others suggest that reverse mounting is a normal behavioral trait during courtship […]

Study Plan for Avian Injury Study

American Kestrel (Falco sparverius) Science Article 21 abstract Past and continuing discharges of polychlorinated biphenyls (PCBs) have contaminated the natural resources of the Hudson River. The Hudson River Natural Resource Trustees – New York State, the U.S. Department of Commerce, and the U.S. Department of the Interior – are conducting a natural resource damage assessment […]

Hypothermic tolerance in an embryonicAmerican kestrel (Falco sparverius)

American Kestrel (Falco sparverius) Science Article 4 abstract Embryos of several bird species tolerate acute hypothermia. However, the extent to which it can be toleratedby wild species living under natural conditions is poorly documented. At a single American kestrel (Falco sparverius)nest 15 days into incubation, we observed a 21-h bout of egg neglect by the […]

Conservation Assessment for the American Kestrel in the Black Hills National Forest, South Dakota and Wyoming.

American Kestrel (Falco sparverius) Science Article 14 abstract This report assesses the biology and conservation status of the American kestrel (Falco sparverius) in the Black Hills National Forest of South Dakota and Wyoming. The goal of this assessment is to assimilate historical and current literature on the kestrel to provide managers and the general public […]

Possible relationships between morphology, territoryquality, and skin color of American Kestrels

American Kestrel (Falco sparverius) Science Article 10 abstract Carotenoid-based coloration of skin and plumage has been found to be correlated with individualquality in many species of birds during the breeding season. However, less is known about the possible role of thesesignals during the nonbreeding season, particularly among nonpasserines that defend winter territories. AmericanKestrels (Falco sparverius) […]