Download or read book Sightings of Grizzly Bears in the Greater Yellowstone Ecosystem written by Lyman L. McDonald and published by . This book was released on 1989 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sightings of Grizzly Bears in the Greater Yellowstone Ecosystem written by Lyman L. McDonald and published by . This book was released on 1988 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a progress report on the first year of a three-year study to determine the efficacy and cost of using grizzly bear sightings reported on mail questionnaires as a method of monitoring grizzly bear population abundance and distribution.
Download or read book Sightings of Grizzly Bears in the Greater Yellowstone Ecosystem written by Lyman L. McDonald and published by . This book was released on 1989 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Yellowstone Grizzly Bears written by Daniel D. Bjornlie and published by National Park Service Yellowstone National Park. This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temporal Spatial and Environmental Influences on the Demographics of Grizzly Bears in the Greater Yellowstone Ecosystem written by and published by . This book was released on 2006 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past 2 decades, the grizzly bear (Ursus arctos) population in the Greater Yellowstone Ecosystem (GYE) has increased in numbers and expanded in range. Understanding temporal, environmental, and spatial variables responsible for this change is useful in evaluating what likely influenced grizzly bear demographics in the GYE and where future management efforts might benefit conservation and management. We used recent data from radio-marked bears to estimate reproduction (1983-2002) and survival (1983-2001); these we combined into models to evaluate demographic vigor (lambda [k]). We explored the influence of an array of individual, temporal, and spatial covariates on demographic vigor. -- Abstract, first paragraph.
Download or read book Distribution of Grizzly Bears in the Greater Yellowstone Ecosystem in 2004 written by Charles C. Schwartz and published by . This book was released on 2006 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The US Fish and Wildlife Service (USFWS) proposed delisting the Yellowstone grizzly bear (Ursus arctos horribilis) in November 2005. Part of that process required knowledge of the most current distribution of the species. Here, we update an earlier estimate of occupied range (1990-2000) with data through 2004. We used kernel estimators to develop distribution maps of occupied habitats based on initial sightings of unduplicated females (n = 481) with cubs of the year, locations of radiomarked bears (n = 170), and spatially unique locations of conflicts, confrontations, and mortalities (n = 1,075). Although each data set was constrained by potential sampling bias, together they provided insight into areas in the Greater Yellowstone Ecosystem (GYE) currently occupied by grizzly bears. The current distribution of 37,258 km2 (1990-2004) extends beyond the distribution map generated with data from 1990-2000 (34,416 km2). Range expansion is particularly evident in parts of the Caribou-Targhee National Forest in Idaho and north of Spanish Peaks on the Gallatin National Forest in Montana.
Download or read book Grizzly written by and published by Rizzoli Publications. This book was released on 2015-10-13 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Renowned photographer Thomas D. Mangelsen’s latest project focuses on a celebrated Yellowstone grizzly bear family, which he has been tracking and photographing for ten years. The grizzly bears of Yellowstone and Grand Teton National Parks are the most famous wild bruins in the world. Millions of people and generations of travelers annually make special pilgrimages to the northern Rockies just to catch sight of these powerful, breathtaking animals. But like a lot of large predator populations on earth, grizzlies in the lower 48 states have struggled for survival. In Grizzly, renowned nature photographer Thomas D. Mangelsen and environmental writer Todd Wilkinson team up to tell the inspiring if sometimes harrowing story of a remarkable bear clan: Mother Grizzly 399 and her generations of offspring. While tracking this charismatic band of bears, Mangelsen has amassed an incomparable photographic portfolio that offers an intimate glimpse into the lives of this celebrated bear family. The rescue of Yellowstone grizzlies ranks as one of the greatest feats of wildlife conservation. WINNER 2016 - Outdoor Writers Association of America - Book of the Year
Download or read book Distribution of Grizzly Bears in the Greater Yellowstone Ecosystem 1990 2000 written by Charles C. Schwartz and published by . This book was released on 2002 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Yellowstone grizzly bear (Ursus arctos horribilis) has been expanding its range during the past 2 decades and now occupies historic habitats that had been vacant. A current understanding of the distribution of grizzly bears within the ecosystem is useful in the recovery process and to help guide the state and federal land management agencies and state wildlife agencies of Idaho, Wyoming, and Montana as they prepare management plans. We used kernel estimators to develop distribution maps of occupied habitats based on initial sightings of unduplicated females (n = 300) with cubs-of-the-year, information from radiomarked bears (n = 105), and locations of conflicts, confrontations, and mortalities (n = 1,235). Although each data set was constrained by potential sampling bias, together they provided insight into areas within the Greater Yellowstone Ecosystem (GYE) currently occupied by grizzly bears. The current distribution (1990?2000) extends beyond the recovery zone identified in the U.S. Fish and Wildlife Service (USFWS) Recovery Plan. Range expansion is particularly evident in the southern portion of the ecosystem in Wyoming. A comparison of our results from the 1990s to previously published distribution maps show an approximate increase in occupied habitat of 48% and 34% from the 1970s and 1980s, respectively. We discuss data biases and problems implicit to the analysis.
Download or read book The Grizzly Bears of Yellowstone written by John Johnson Craighead and published by . This book was released on 1995 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additionally, the 1993 federal Grizzly Bear Recovery Plan is critiqued and an alternative plan is proposed. The authors state convincingly that the greatest threat to the survival of the grizzly bear is neither a lack of firm biological knowledge nor a lack of understanding in how to apply this information. Rather, the threat lies with our politico-economic system that demands unsustainable use of our public land and water resources.
Download or read book The Bears of Yellowstone written by Paul Schullery and published by . This book was released on 1992 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This completely revised third edition of The Bears of Yellowstone remains a benchmark wildlife study.
Download or read book Grizzly Bear Management in the Yellowstone Ecosystem written by United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Environmental Pollution and published by . This book was released on 1984 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Yellowstone National Park N P Grizzly Bear Management Program MT ID WY written by and published by . This book was released on 1983 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grizzly Bear Distribution in the Yellowstone Area 1973 79 written by Joseph V. Basile and published by . This book was released on 1982 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reported sightings of grizzly bears or their sign in the Yellowstone area were compiled for the 1973-79 period and, where sufficient detail permitted, plotted on maps of 10 000 m grid. The 7-year composite of observations probably fairly represents the overall distribution of the grizzly bear. Factors meriting consideration in future monitoring are presented.
Download or read book Evaluation of Rules to Distinguish Unique Female Grizzly Bears with Cubs in Yellowstone written by Charles C. Schwartz and published by . This book was released on 2008 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The United States Fish and Wildlife Service uses counts of unduplicated female grizzly bears (Ursus arctos) with cubs-of-the-year to establish limits of sustainable mortality in the Greater Yellowstone Ecosystem, USA. Sightings are clustered into observations of unique bears based on an empirically derived rule set. The method has never been tested or verified. To evaluate the rule set, we used data from radiocollared females obtained during 1975?2004 to simulate populations under varying densities, distributions, and sighting frequencies. We tested individual rules and rule-set performance, using custom software to apply the rule-set and cluster sightings. Results indicated most rules were violated to some degree, and rule-based clustering consistently underestimated the minimum number of females and total population size derived from a nonparametric estimator (Chao2). We conclude that the current rule set returns conservative estimates, but with minor improvements, counts of unduplicated females-with-cubs can serve as a reasonable index of population size useful for establishing annual mortality limits. For the Yellowstone population, the index is more practical and cost-effective than capture-mark-recapture using either DNA hair snagging or aerial surveys with radiomarked bears. The method has useful application in other ecosystems, but we recommend rules used to distinguish unique females be adapted to local conditions and tested.
Download or read book Distribution of Grizzlies in Yellowstone National Park written by Tyler Brasington and published by . This book was released on 2016-06-16 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study looks at the distribution of grizzly bear sightings in Yellowstone National Park from February 23 - June 6, 2016. Emphasis is placed on locating and following females with cubs. Emphasis is on the northern range.
Download or read book Yellowstone Grizzly Bear Investigations written by Interagency Grizzly Bear Study Team and published by . This book was released on 1977 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Conservation and Management of Grizzly Bears in the Greater Yellowstone Ecosystem written by Patricia L. Haggerty and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
