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Showing 1 to 20 of 24 for “"bighorn sheep"”.
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Desert bighorn sheep in Mexico
The management of bighorn sheep in Mexico is not based on empirical data. We conducted phone interviews and a literature review to determine published information on desert bighorn sheep in Mexico. Most information on bighorn sheep was published prior to 1983 and focused on population size and …
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Trace element analysis of bighorn sheep horns
A total of 249 samples of horn material from bighorn sheep was collected from nine locations. The concentrations of eight elements were determined in all samples by inductively coupled argon plasma spectroscopy. Year of horn growth was determined for 154 of the samples. All elements of …
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Evaluation of Mineral Use in Bighorn Sheep (Ovis canadensis)
Bighorn sheep (Ovis canadensis) are an ecologically fragile species (Valdez and Krausman 1999). Bighorn sheep are not federally listed as threatened or endangered, but they should be considered a species of concern due to human-induced disturbance and encroachment on their habitat (Krausman 1993). …
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Habitat Selection and Resource Use by Bighorn Sheep Following Translocation
… to restore struggling populations of wild sheep, elk, deer, goats, and other wildlife. One of the most effective restoration tools to emerge from this era was translocation of individuals by physically moving them from healthy source populations to formerly occupied habitats. This process …
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Short-term effects of wildfire on Sierra Nevada bighorn sheep habitat ecology
… habitat selection by endangered Sierra Nevada bighorn sheep (Ovis candensis sierrae; hereafter Sierra bighorn) for 2 years following wildfire on winter ranges in eastern California. We hypothesized that wildfire would change both forage availability and predation risk. Green forage biomass on …
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Short-term effects of wildfire on Sierra Nevada bighorn sheep habitat ecology
… habitat selection by endangered Sierra Nevada bighorn sheep (Ovis candensis sierrae; hereafter Sierra bighorn) for 2 years following wildfire on winter ranges in eastern California. We hypothesized that wildfire would change both forage availability and predation risk. Green forage biomass on …
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Evaluation of an Augmentation of Rocky Mountain Bighorn Sheep at Badlands National Park, South Dakota
<p>Audubon’s (a.k.a. Badlands) bighorn (Ovis canadensis auduboni [Merriam 1901] now O. c. Canadensis [Shaw 1804]), described as a subspecies of bighorn sheep, was extirpated from its range by 1924. In 1964, 22 Rocky Mountain bighorn sheep were translocated from Pikes Peak, Colorado, to Badlands …
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Determining Impacts of Mountain Lions on Bighorn Sheep and Other Prey Sources in the Black Hills
… cougar (Puma concolor) feeding habits and bighorn sheep (Ovis canadensis) population dynamics in the Black Hills, South Dakota. We used Global Positioning System (GPS) telemetry to locate 1,506 cougar feeding events and found deer (Odocoileus spp.; 83%), primarily white-tailed deer (O. …
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Habitat Selection and Sexual Suggestion of Rocky Mountain Bighorn Sheep in Custer State Park, South Dakota
Spatial segregation between Rocky Mountain bighorn sheep (Ovis canadensis canadensis) ram and ewe herds has been documented by Geist (1971), Geist and Petocz (1977), Shank (1979), Morgantini and Hudson (1981), and Hogg (1983), where ram herds consist of mature males approximately 4 years old and …
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Lungworm Infections, Reproduction and Summer Habitat Use of Bighorn Sheep in Custer State Park, South Dakota
Bighorn sheep (Ovis canadensis) were once indigenous to the Black Hills and Badlands of South Dakota. When European settlers moved into this region during the late 1800' s, market hunting, loss of habitat, and introduction of animal diseases and parasites caused the subspecies of the region, the …
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CAUSE SPECIFIC MORTALITY OF DESERT BIGHORN SHEEP LAMBS IN THE FRA CRISTOBAL MOUNTAINS, NEW MEXICO, USA
Desert bighorn sheep (Ovis canadensis mexicana) are an endangered species in New Mexico. Many of the small, isolated populations of desert bighorn are declining, and factors affecting their growth rates include low lamb recruitment and high mortality of adults due to cougar predation. No one has …
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CAUSE SPECIFIC MORTALITY OF DESERT BIGHORN SHEEP LAMBS IN THE FRA CRISTOBAL MOUNTAINS, NEW MEXICO, USA
Desert bighorn sheep (Ovis canadensis mexicana) are an endangered species in New Mexico. Many of the small, isolated populations of desert bighorn are declining, and factors affecting their growth rates include low lamb recruitment and high mortality of adults due to cougar predation. No one has …
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Patterns of helminth and protozoan parasite infections in bighorn sheep, Ovis canadensis: sex, season and activity
… energy and nutrients away from the hosts. I used bighorn sheep, Ovis canadensis, and five of their natural parasites, strongyle, Nematodirus spp., Marshallagia spp., lungworm and Eimeria spp., to investigate seasonality of parasites and host-sex bias and whether higher parasite FEC leads to …
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Escaping the extinction vortex: identifying factors affecting population performance and recovery in endangered Sierra Nevada bighorn sheep
… efforts for federally endangered Sierra Nevada bighorn sheep, the rarest subspecies of mountain sheep in North America. I initiated a combination of demographic, habitat and genetic analyses to identify the stochastic and deterministic factors limiting the recovery of this subspecies, examine …
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Escaping the extinction vortex: identifying factors affecting population performance and recovery in endangered Sierra Nevada bighorn sheep
… efforts for federally endangered Sierra Nevada bighorn sheep, the rarest subspecies of mountain sheep in North America. I initiated a combination of demographic, habitat and genetic analyses to identify the stochastic and deterministic factors limiting the recovery of this subspecies, examine …
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Effects of Ivermectin on Lungworm Infection and Lamb Survival of Bighorn Sheep in Custer State Park, South Dakota
… rates, and survival of lambs of free-ranging bighorn sheep in Custer State Park (CSP), South Dakota. Three distinct ewe herds in CSP allowed for comparisons among ewes given o, l, and 2 treatments of ivermectin. Treatments were given in February and March, 1987, and January and February, 1988. …
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A study assessing forage quality and desert bighorn sheep (Ovis canadensis nelsoni) diet in central Nevada using microhistology and molecular analysis
Desert bighorn sheep (Ovis canadensis nelsoni) populations in central Nevada have suffered from die-offs although biologists and wildlife managers have struggled to determine the exact cause of these population declines, making population management difficult. An important, often overlooked and …
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Desert bighorn movements and habitat use in relation to the proposed Black Canyon Bridge Project, Nevada
… the Eldorado Mountains, Nevada, to characterize bighorn sheep (Ovis canadensis) habitat quality, and information on movements of radio-collared bighorn to estimate home range size and patterns of movement. Study results were used to evaluate potential impacts of three proposed highway alignments …
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Species Identification of the Stylohyoid Bone for North American Artiodactyls
… of 15 hooved mammals: cattle, bison, domestic sheep, bighorn sheep, Dall sheep, mountain goat, domestic goat, elk, caribou, white-tailed deer, mule deer, moose, pronghorn antelope, domestic pig, and horse. Objectives included documenting how to side the stylohyoid (left or right), and producing …
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Tekison Cave: A Case Study in Archaeological Collection Rehabilitation and Accessibility
… a faunal analysis (which showed presence of bighorn sheep with evidence of butchery), radiocarbon dating (which provided two age estimates about 900 years ago), and sourced an obsidian biface (from Whitewater Ridge, Oregon). I interviewed an original excavator to better understand the …
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