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, […]
Category: Falconiformes
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) […]
ISOLATION OF A HERPESVIRUS FROM AN AMERICANKESTREL WITH INCLUSION BODY DISEASE
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 […]
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 […]