| psoroptic scabies in desert bighorn sheep (ovis canadensis nelsoni) from northwestern arizona. | scabies due to infestation by psoroptes ovis was monitored from 1979 through 1981 in nelson's desert bighorn sheep in northwestern arizona. visual examinations for ear lesions and evaluations of ear scrapings were used to assess the prevalence of mites in sheep that were live-captured or killed during the hunting season. the prevalence of psoroptic scabies in live-captured sheep for the years 1979, 1980, and 1981, was 25%, 25%, and 0%, respectively, and was higher in rams (1979, 65%; 1980, 100%) ... | 1983 | 6644933 |
| isolations of aerobic bacteria from wild desert bighorn sheep (ovis canadensis nelsoni and o. c. mexicana) in arizona. | nasal, pharyngeal, cervical and vaginal swab specimens were obtained from 74 desert bighorn sheep for the purpose of investigating the normal aerobic bacterial flora of wild sheep. a total of 281 isolates was obtained and identified by standard microbiologic tests. one hundred seven of these isolates were gram positive and included bacillus sp. (36%), staphylococcus epidermidis (8%), s. aureus (4%), corynebacterium sp. (diphtheroids, 4%), and streptococcus sp. (48%). gram negative isolates total ... | 1983 | 6887449 |
| survey of chronic sinusitis-induced skull anomalies in desert bighorn sheep. | bone anomalies were found in 20% of 630 skulls from desert bighorn sheep (ovis canadensis) representing populations of california bighorn (o canadensis californiana), lower california bighorn (o canadensis cremnobates), mexican bighorn (o canadensis mexicana), and nelson bighorn (o canadensis nelsoni) that are native to arizona, california, nevada, new mexico, and utah. the anomalies were extremely diverse, ranging from osteonecrosis within the matrix of the paranasal sinuses to extensive lysis ... | 1981 | 7327996 |
| the distribution of dermacentor hunteri and anaplasma sp. in desert bighorn sheep (ovis canadensis). | the ixodid tick dermacentor hunteri has been collected intermittently this century, primarily from desert bighorn sheep (ovis canadensis). anaplasma spp. are intraerythrocytic rickettsial parasites of ungulates and are vectored in the western united states by ticks of the genus dermacentor. we tested the hypotheses that d. hunteri would be found infesting all populations of desert bighorn, and that all infested populations would be seropositive for anaplasma sp. dermacentor hunteri was found on ... | 1997 | 9057693 |
| the rise and fall of psoroptic scabies in bighorn sheep in the san andres mountains, new mexico. | between 1978 and 1997, a combination of psoroptic scabies (psoroptes spp.), mountain lion (puma concolor) predation, and periodic drought reduced a population of native desert bighorn sheep (ovis canadensis) in the san andres mountains (sam), new mexico, from >200 individuals to a single ewe. in 1999, this ewe was captured, ensured to be psoroptes-free, and released back into the sam. eleven radio-collared rams were translocated from the red rock wildlife area (rrwa) in new mexico into the sam r ... | 2005 | 16244062 |
| potential effects of the united states-mexico border fence on wildlife. | security infrastructure along international boundaries threatens to degrade connectivity for wildlife. to explore potential effects of a fence under construction along the u.s.-mexico border on wildlife, we assessed movement behavior of two species with different life histories whose regional persistence may depend on transboundary movements. we used radiotelemetry to assess how vegetation and landscape structure affect flight and natal dispersal behaviors of ferruginous pygmy-owls (glaucidium b ... | 2010 | 19558522 |
| rapid decrease in horn size of bighorn sheep: environmental decline, inbreeding depression, or evolutionary response to trophy hunting? | there are numerous examples demonstrating that selection has greatly influenced phenotypes in wild-harvested species. here, a significant reduction in horn size in trophy desert bighorn sheep rams over 30 years in a reintroduced population in aravaipa canyon, arizona is documented. after examining the potential effects of a detrimental change in the environment, inbreeding depression, and hunter-caused evolutionary change, it appears that environmental deterioration, apparently from the effects ... | 2011 | 21900210 |
| potential foraging decisions by a desert ungulate to balance water and nutrient intake in a water-stressed environment. | arid climates have unpredictable precipitation patterns, and wildlife managers often provide supplemental water to help desert ungulates endure the hottest, driest periods. when surface water is unavailable, the only source of water for ungulates comes from the forage they consume, and they must make resourceful foraging decisions to meet their requirements. we compared two desert bighorn sheep (ovis canadensis nelsoni) populations in arizona, usa: a treatment population with supplemental water ... | 2016 | 26894504 |