| virulence of raptor-origin pasteurella multocida in domestic chickens. | pasteurella multocida belonging to somatic serotype 1 and capsular type a has been known to cause avian cholera in domestic poultry. pasteurella multocida serotype 1 has also been isolated from raptorial birds. however, the capsular type for these raptorial isolates remains unknown. moreover, the virulence of these raptorial isolates for domestic poultry has not been determined. the objectives of this study were to determine the capsular type of raptorial p. multocida serotype 1 isolates and to ... | 1999 | 10396641 |
| resource partitioning among forest owls in the river of no return wilderness, idaho. | we studied resource partitioning among the forest owls in the river of no return wilderness, idaho, during the winter and spring of 1980 and 1981. the owl assemblage consisted of five abundant species: pygmy (glaucidium gnoma), saw-whet (aegolius acadicus), boreal (a. funereus), western screech (otus kennicottii), and great-horned (bubo virginianus). long-eared (asio otus) and flammulated (o. flammeolus) owls were rarely observed. information from the literature supplemented our data to describe ... | 1988 | 28310843 |
| lead in hawks, falcons and owls downstream from a mining site on the coeur d'alene river, idaho. | mining and smelting at kellogg-smelterville, idaho, resulted in high concentrations of lead in coeur d'alene (cda) river sediments and the floodplain downstream, where american kestrels (falco sparverius), northern harriers (circus cyaneus), red-tailed hawks (buteo jamaicensis), great horned owls (bubo virginianus), and western screech-owls (otus kennicotti) nested. nestling american kestrels contained significantly higher (p=0.0012) blood lead concentrations along the cda river (0.24 µg/g, wet ... | 1994 | 24221348 |
| low prevalence of west nile virus antibodies in select northern california owl species (2007-2014). | the objective of this study was to determine evidence of previous west nile virus (wnv) infection in northern california owls. owl serum samples were collected from birds presenting to a veterinary medical teaching hospital between 2007 and 2014 and were screened for the presence of wnv antibodies by an indirect enzyme immunoassay (eia). only one of 71 samples (1.41%) tested was positive by eia and confirmed by a plaque reduction neutralization test; it was the most recent sample collected. the ... | 2017 | 29297801 |
| avian thermoregulation in the heat: metabolism, evaporative cooling and gular flutter in two small owls. | the thermoregulatory responses of owls to heat stress have been the subject of few studies. although nocturnality buffers desert-dwelling owls from significant heat stress during activity, roost sites in tree and cactus cavities or in deep shade provide only limited refuge from high environmental temperatures during the day. we measured thermoregulatory responses to acute heat stress in two species of small owls, the elf owl (micrathene whitneyi) and the western screech-owl (megascops kennicotti ... | 2018 | 29925545 |
| corticosterone and the stress response in young western screech-owls: effects of captivity, gender, and activity period. | we used a standard handling protocol to examine the stress response of captive young western screech-owls during their active (nighttime) and inactive (daytime) periods and to compare the stress responses of captive and free-living owls. circulating corticosterone levels were significantly higher during the inactive period than in the active period in this nocturnal species. this suggests that the daily pattern of corticosterone secretion is reversed in nocturnal birds and is correlated with act ... | 2013 | 9231386 |
| medical management of acute ocular hypertension in a western screech owl (megascops kennicottii). | a wild young adult western screech owl (megascops kennicottii) of unknown sex was presented for evaluation of an abnormal left eye (os). ophthalmic examination os revealed raised intraocular pressure (37 mm hg; reference interval 7-16 mm hg), mydriasis, conjunctival and episcleral hyperemia, shallow anterior chamber due to anterior displacement of the lens and iris, rubeosis iridis, and engorgement of the pecten. the intraocular pressure in the right eye (od) was 11 mm hg. multifocal pale, varia ... | 2014 | 24881152 |
| effects of social status on the dispersal behaviour of juvenile western screech-owls. | variation in timing and distance of dispersal movements of juvenile birds may result from differences in competitive ability. dispersal by low-ranking juveniles may be initiated before dominants if the latter force subordinate siblings from natal areas. conversely, when vacant territories are limited and are acquired on a first-come first-served basis, selection could operate on young to disperse as early as possible. in this case, dominant individuals with priority of access to resources in the ... | 1999 | 10202096 |