Download or read book Population Characteristics and Habitat Utilization of Bighorn Sheep Steens Mountain Oregon written by Walter A. Van Dyke and published by . This book was released on 1978 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: A herd of re-introduced California bighorn sheep (Ovis canadensis californiana) was studied from 15 June 1976 to 31 August 1977. Thirteen major and seven minor habitats were delineated and described. Habitat use by bighorns was observed throughout the study and a habitat preference value (H.P.V.) was calculated based on use by ewe-lamb groups. Certain habitats were highly preferred for foraging or resting by bighorns during different seasons of the year, probably because of the physical and vegetative characteristics they offered. Examination of daily activity patterns of ewe-lamb groups revealed that they primarily fed in the morning, rested at mid-day, and again fed toward evening during all seasons. Comparison of the activity budgets (time allotment for the various activities) between the sex and age groups within seasons disclosed statistical differences in all seasons. In spring lambs foraged less and pursued other activities more than ewes or rams. In summer, rams foraged less than lambs and lambs foraged less than ewes. The reverse trend was noted for resting activity. These trends were probably related energy demands of each sex and age class. In fall and winter no difference was found between the activity budgets of ewes and lambs. Adult rams, however, spent less time foraging and more time resting and pursuing other activities than ewes or lambs. This was related to energy demands and the rut. Estimated herd size fluctuated between 128 and 180 individuals with most of the change attributable to birth and subsequent mortality of lambs. Factors responsible for lamb mortality were not identified but losses appeared related to parasites and disease; Between 1976 and 1977 the population increased very little.
Download or read book Habitat Use and Population Characteristics of Bighorn Sheep on Hart Mountain National Antelope Refuge Oregon written by David Carl Payer and published by . This book was released on 1992 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mountain Sheep of North America written by Raul Valdez and published by University of Arizona Press. This book was released on 2021-11-09 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mountain sheep epitomize wilderness for many people because they occupy some of the most inaccessible and rugged habitats known to man, from desert crags to alpine mountains. But of all hoofed mammals in North America, wild sheep present the greatest management problems to biologists. This book is a major reference on the natural history, ecology, and management of wild sheep in North America. Written by wildlife biologists who have devoted years of study to the animals, it covers Dall's and Stone's sheep and Rocky Mountain, California, and desert bighorn and examines a variety of factors pertinent to their life histories: habitat, diet, activity, social organization, reproduction, and population dynamics. Additional chapters consider distribution and abundance, adaptive strategies, and management guidelines. Discussions on diseases of wild sheep present a wealth of information that will be of particular use to wildlife biologists, including detailed clinical descriptions of conditions that threaten sheep populations, from pasteurellosis to capture myopathy. An appendix reviews the cytogenetics and genetics of wild sheep. North American wild sheep may face extinction in many areas unless critical questions concerning their management are answered soon. Prior to the publication of this book, there was no single reference available in which one could find such a synthesis of information. Mountain Sheep of North America provides that source and points toward the preservation of these magnificent wild creatures.
Download or read book Status and Habitat Use of California Bighorn Sheep on Hart Mountain Oregon written by Christine Anne Kornet and published by . This book was released on 1978 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: California bighorn sheep (Ovis canadensis californiana) were studied on Hart Mountain, Oregon, during the summer and fall of 1976, and the spring of 1977. The population consisted of a minimum of 196 sheep in June, 1977. The high number of lambs observed and high lamb:ewe ratios throughout both years of the study indicated that the population was expanding rapidly. Sheep occupied about 85 percent of the length of the mountain; ewe-lamb groups occupied 25 percent. Both ewes and rains occurred on two distinct ranges during all seasons, and interchange of individuals between the two ranges was minimal during the study. Most rutting activity occurred during November. Lambs were born between mid-April and late May. Fifteen habitats within the ewe-lamb range were identified and sampled for plant species composition. A habitat preference value (HPV) was calculated for each habitat on Hart Mountain, based on use by ewe groups. Bluebunch wheatgrass (Agropyron spicatum) and big sagebrush (Artemisia tridentata) were the two most widely distributed plant species in the ewe-lamb range; Idaho fescue (Festuca idahoensis) provided the greatest amount of herbaceous cover. Daily activities of ewe groups centered around four contiguous bedding grounds and three principal feeding areas. Topography, as well as vegetational composition, appeared to influence the preference of ewes for certain locations, particularly for major cliff formations and adjacent feeding\ areas. Habitat factors unique to the present ewe-lamb range are discussed as possible determinants of its location.
Download or read book Land Mammals of Oregon written by B. J. Verts and published by Univ of California Press. This book was released on 1998 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive, up-to-date treatment of mammals of Oregon since Vernon Bailey's THE MAMMALS AND LIFE ZONES OF OREGON was published in 1936. This new book provides a basic reference to mammalian life in the northwestern U.S., with descriptions of 136 extant or recently extirpated species. 122 color and 36 b&w photos, 140 maps, 150 drawings.
Download or read book Wild Mammals of North America written by George A. Feldhamer and published by JHU Press. This book was released on 2003-11-19 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Table of contents
Download or read book Habitat Use and Population Characteristics of Newly Reintroduced California Bighorn Sheep Ovis Canadensis Californiana in South central Idaho written by Gretchen Irene Fowles and published by . This book was released on 2002 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Translocations of bighorn sheep have had variable success due to the lack of good quality, predictive habitat models and of regular follow-up monitoring of translocated populations. This research helps to fill these voids. Radio telemetry was used to estimate the habitat use of a newly reintroduced population of California bighorn sheep (Ovis canadensis californiana) on the Jim Sage Range in Idaho. The habitat characteristics of locations used by groups of sheep were compared to those of randomly selected locations over two different geographic scales by use of GIS and logistic regression. The characteristics included vegetative composition, terrain ruggedness, distance to water sources, distance to steep slopes, slope, aspect, and elevation. Predictive habitat selection models based on winter, lambing, and summer habitat use were developed. The habitat models correctly classified 78-82% of used locations. Open grassy areas, distance to steep slopes and water, high elevation, and rugged terrain significantly contributed to the presence of sheep. The models suggested that there is an adequate amount of suitable habitat to support a viable population on the Jim Sage Range but that barriers may prevent their access to a portion of the range. Characteristics of the population, including births, deaths, movement patterns, and group composition and size were also monitored so that baseline data with which to compare future data to evaluate the status of the population would be provided. Adequate lambing and recruitment rates were observed. Twenty-two deaths occurred since the first translocation, and mountain lions were a major cause of these. Most of the mountain lion kills occurred during the first four months after the first release. Group size varied seasonally and was positively affected by population density.
Download or read book Seasonal Sex specific Habitat Selection by a Low Elevation Population of Bighorn Sheep written by Edward Alan Klinksiek and published by . This book was released on 2004 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-elevation habitats may pose problems for reintroduced bighorn sheep where fire suppression and human presence have altered the landscape. Because male and female bighorn segregate for much of the year, habitat use may differ and impose new management strategies for restoring and maintaining populations of bighorn in these unique habitats. Seasonal, sex-specific habitat use was studied in a northwest Nebraska population of bighorn sheep from January- August, 2002 and 2003. Close proximity to escape terrain was a significant component of habitat selection models for all group types in all seasons, except winter 2002 for mixed-sex groups. Elevation was also important in habitat selection by all group types in all seasons, except males in spring 2003, with bighorn sheep found at lower elevations than random points. Slope was an important component during most seasons with all groups selecting areas with steeper slopes. Although not important in habitat selection by males, aspect was an important component of habitat selection by females and mixed-sex groups in 2003. Habitat type was important to males and females in spring and summer, but not for mixed-sex groups. Mixed-sex groups and female groups in winter and spring were found farther from water than expected. Distance to disturbance, although not important to mixed-sex groups, only appeared important to females in summer, when they were found closer to disturbance, and males in spring 2002, when they were found farther than expected from disturbance features. Sex differences in habitat use included female bighorn using areas closer to escape terrain and disturbance features, and lower in elevation than male bighorn. Although segregation of male and female bighorn sheep occurred during the spring and summer seasons, use of habitat types did not differ. Visibilities did not differ between male and female locations. When segregated, habitat use by male and female bighorn in the Pine Ridge appears to be regulated primarily by escape terrain with habitat type, slope, and elevation also being important factors. Continued survival and expansion of bighorn sheep in the Pine Ridge should focus on protection of current areas of use from disturbance and identification and enhancement of similar habitats.
Download or read book Recreation Area Management Final Plan for the Steens Mountain Recreation Lands Oregon written by and published by . This book was released on 1985 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pueblo Lone Mountain Allotment Management Plan Environmental Assessment EA written by and published by . This book was released on 1995 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Bibliography to Rocky Mountain Bighorn Sheep Literature written by and published by . This book was released on 1999 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rangewide Plan for Managing Habitat of Desert Bighorn Sheep on Public Lands written by United States. Bureau of Land Management and published by . This book was released on 1989 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Habitats in Managed Rangelands written by Walter A. Van Dyke and published by . This book was released on 1983 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Desert Bighorn Sheep written by Norman S. Smith and published by . This book was released on 1988 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Habitat Use and Movements of Desert Bighorn Sheep Near the Silver Bell Mine Arizona written by Kirby D. Bristow and published by . This book was released on 1996 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oregon Wilderness written by and published by . This book was released on 1990 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Desert Bighorn Sheep written by Norman S. Smith and published by . This book was released on 1988 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
