Tag: American Kestrel

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, […]

Nest Success of Southeastern American KestrelsAssociated with Red-Cockaded Woodpeckers inOld-Growth Longleaf Pine Habitat in Northwest Florida

American Kestrel (Falco sparverius) Science Article 8 abstract The Southeastern American Kestrel (Falco sparverius paulus), anon-migratory subspecies of the widespread American Kestrel, has declined tothe point that it is listed as threatened in Florida, the state in which it is mostcommon. We studied the nesting biology of Southeastern American Kestrels in1999 and 2000 at Eglin […]

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) […]


American Kestrel (Falco sparverius) Science Article 13 abstract A herpesvirus was isolated from the liver of a captive-bred American kestrel(Falco sparverius) which had died of inclusion body disease. Initial isolation wasachieved in chicken embryo fibroblasts after three blind passages. Cell-adapted virusproduced a distinct rounding of CEF cells within 24 to 48 h. Biologic and serologictests […]

Regulation of Yolk-Androgen Concentrations byPlasma Prolactin in the American Kestrel

American Kestrel (Falco sparverius) Science Article 12 abstract The concentrations of maternally derived androgens in the yolks of avian eggs vary within and among clutches, but a mechanistic basis for this variation has not been elucidated. We investigated in the American kestrel, Falco sparverius, whether changes in plasma-prolactinconcentrations induced by changes in photoperiod and food […]

Copulatory behaviour and paternity in the American kestrel:the adaptive significance of frequent copulations

American Kestrel (Falco sparverius) Science Article 11 abstract The adaptive significance of repeated withinpair copulations is not well understood. We analysed thecopulatory behaviour of 16 pairs of solitary-nesting American kestrels, Falco sparverius, in southernQuebec (Canada), and the achieved reproductive success (paternity) of 21 kestrel families determined byDNA fingerprinting, in terms of four hypotheses. (1) The […]