Tag: Falco sparverius

Antibody-mediated immunotoxicity in American Kestrels (Falco sparverius) exposed to polychlorinated biphenyls.

American Kestrel (Falco sparverius) Science Article 23 abstract Antibody-mediated immune function in adult and recently fledged (30 to 33 d old) American kestrels (Falco sparverius) was examined in birds exposed directly, or only in ovo, to polychlorinated biphenyls (PCBs). In 1998, 9 mature male and 9 female kestrels were fed PCBs, whereas 9 females and […]

Misdirected incubation in American Kestrels: a case of competition for nest sites?

American Kestrel (Falco sparverius) Science Article 20 abstract Reports of birds exhibiting unusual incubation behaviors are perhaps not surprising, giventhe wide variety of physical properties that can elicit incubation responses in birds (seeBaerends and Drent 1982). Birds that normally are solitary nesters occasionally have beendocumented sharing the same nest site (Terres 1982, Fournier and Hines […]

Sex-related differences in habitat selection in wintering American kestrels,Falco sparverius

American Kestrel (Falco sparverius) Science Article 1 abstract The American kestrel, Falco sparverius, has sex-related differences in habitat use during thenon-breeding season, with females occupying more open habitats than males. Two competinghypotheses have been proposed to explain this phenomenon: (1) males and females prefer differenthabitats, and (2) males and females prefer similar habitats, but larger […]

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, […]

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 […]

ECOLOGICAL CORRELATES OF MATE REPLACEMENT IN THEAMERICAN KESTREL

American Kestrel (Falco sparverius) Science Article 19 abstract During 1983 and 1984 one adult member of 20 pairs of breeding kestrels was removedfrom the wild during the third week of incubation. We measured several variables, e.g., relative prey abundance, female body condition, territory size, amount of adjacent habitat, and time of removal at each experimental […]