| evaluating a rapid field assessment system for anticoagulant rodenticide exposure of raptors. | anticoagulant rodenticides (ars) are commonly used to control rodent pests. however, worldwide, their use is associated with secondary and tertiary poisoning of nontarget species, especially predatory and scavenging birds. no medical device can rapidly test for ar exposure of avian wildlife. prothrombin time (pt) is a useful biomarker for ar exposure, and multiple commercially available point-of-care (poc) devices measure pt of humans, and domestic and companion mammals. we evaluated the potenti ... | 2020 | 33140186 |
| re-occupancy of breeding territories by ferruginous hawks in wyoming: relationships to environmental and anthropogenic factors. | grassland and shrubland birds are declining globally due in part to anthropogenic habitat modification. because population performance of these species is also influenced by non-anthropogenic factors, it is important to incorporate all relevant ecological drivers into demographic models. we used design-based sampling and occupancy models to test relationships of environmental factors that influence raptor demographics with re-occupancy of breeding territories by ferruginous hawks (buteo regalis) ... | 2016 | 27049324 |
| black-tailed prairie dogs and the structure of avian communities on the shortgrass plains. | we tested the hypothesis that black-tailed prairie dogs (cynomys ludovicianus) influence avian community structure on the shortgrass prairie. we surveyed 36 prairie dog towns and 36 paired sites without prairie dogs during summer and fall of 1997, 1998, and 1999 in the oklahoma panhandle. our surveys totaled 9,040 individual observations for 73 avian species. significantly distinct avian communities were present on prairie dog towns when compared to sites within four different macrohabitats of t ... | 2004 | 14685848 |
| aerobic bacterial flora of addled raptor eggs in saskatchewan. | in south-central saskatchewan, canada, in 1986, 1987 and 1989, the aerobic bacterial flora was evaluated from 75 unhatched raptor eggs of three species: 42 of the swainson's hawk (buteo swainsoni), 21 of the ferruginous hawk (buteo regalis), and 12 of the great horned owl (bubo virginianus). in addled swainson's hawk eggs, the most common bacterial genera were enterobacter (18 eggs), escherichia (12), and streptococcus (10). seven great horned owl eggs and six ferruginous hawk eggs also containe ... | 1997 | 9131569 |
| survey design for broad-scale, territory-based occupancy monitoring of a raptor: ferruginous hawk (buteo regalis) as a case study. | given the uncertain population status of low-density, widely-occurring raptors, monitoring changes in abundance and distribution is critical to conserving populations. nest-based monitoring is a common, useful approach, but the difficulty and expense of monitoring raptor nests and importance of reliable trend data to conservation requires that limited resources are allocated efficiently. power analyses offer a helpful tool to ensure that monitoring programs have the ability to detect trends and ... | 2019 | 30901333 |
| a mesothelioma in a ferruginous hawk (buteo regalis). | a malignant mesothelioma diagnosed post mortem in a ferruginous hawk (buteo regalis) resembled similar tumours reported from poultry. it was papillomatous and composed of cuboidal cells. the tumour occupied much of the respiratory tract as well as extending into the left humerus, humero-scapular-coracoid joint and pectoral muscle. | 1984 | 18766889 |
| organochlorine and mercury residues in swainson's and ferruginous hawk eggs collected in north and south dakota, 1974-79. | residues of organochlorine pesticides, polychlorinated biphenyls (pcbs), and mercury were measured in eggs of swainson's hawks (buteo swainsoni) and ferruginous hawks (b. regalis) collected in north and south dakota during 1974-79. dde was the most common compound detected in the eggs, but residues were below levels known to have adverse effects on reproduction. other organochlorine compounds and mercury were found at low levels. eggs of ferruginous hawks tended to contain more compounds with hi ... | 1988 | 24248525 |
| flight initiation by ferruginous hawks depends on disturbance type, experience, and the anthropogenic landscape. | the expansion of humans and their related infrastructure is increasing the likelihood that wildlife will interact with humans. when disturbed by humans, animals often change their behaviour, which can result in time and energetic costs to that animal. an animal's decision to change behaviour is likely related to the type of disturbance, the individual's past experience with disturbance, and the landscape in which the disturbance occurs. in southern alberta and saskatchewan, we quantified probabi ... | 2017 | 28542334 |
| dietary shifts of sympatric buteos during a prey decline. | diets of nesting red-tailed hawks (buteo jamaicensis) and ferruginous hawks (buteo regalis) were sampled before and after a decline in the hawks' principal prey species. diets of pairs that shared their foraging ranges with interspecifics were contrasted with those of pairs whose home ranges did not overlap with interspecifics. current theory predicts that diets should diverge during prey shortages and that overlap should be especially reduced in ranges shared with interspecifics. species compos ... | 1985 | 28310806 |
| prioritizing avian species for their risk of population-level consequences from wind energy development. | recent growth in the wind energy industry has increased concerns about its impacts on wildlife populations. direct impacts of wind energy include bird and bat collisions with turbines whereas indirect impacts include changes in wildlife habitat and behavior. although many species may withstand these effects, species that are long-lived with low rates of reproduction, have specialized habitat preferences, or are attracted to turbines may be more prone to declines in population abundance. we devel ... | 2016 | 26963254 |
| effects of military training activities on shrub-steppe raptors in southwestern idaho, usa. | / between 1991 and 1994, we assessed relative abundance, nesting success, and distribution of ferruginous hawks (buteo regalis), northern harriers (circus cyaneus), burrowing owls (athene cunicularia), and short-eared owls (asio flammeus) inside and outside a military training site in the snake river birds of prey national conservation area, southwestern idaho. the orchard training area is used primarily for armored vehicle training and artillery firing by the idaho army national guard. relative ... | 1999 | 9950702 |
| serological and parasitological prevalence of toxoplasma gondii in wild birds from colorado. | ground-feeding birds are considered important in the epidemiology of toxoplasma gondii because they serve as indicators of soil contamination by oocysts, and birds of prey are indicators of t. gondii prevalence in rodents and other small mammals. cats excrete environmentally resistant oocysts after consuming tissues of t. gondii -infected birds. in the present study, sera and tissues from 382 wild birds from colorado were tested for t. gondii infection. antibodies to t. gondii were found in 38 b ... | 2010 | 20950101 |