District II Grizzly Bear Progress Report [1977] PDF Download
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![District II Grizzly Bear Progress Report [1977] PDF](https://books.google.com/books/content/images/frontcover/oJsbzwEACAAJ?fife=w150-h200)
Author: Larry Roop
Publisher:
ISBN:
Category : Grizzly bear
Languages : en
Pages : 47
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Book Description
Numbers of grizzly bear sightings and sign observations in 1976 were greater than 1975, but did not reach 1973 and 1974 levels. Census flights in Yellowstone National Park showed a similar trend. Factors influencing sightings and census results other than bear population densities are discussed. A total of 44 sightings and sign observations were recorded. Sightings of grizzlies in marginal or unsuitable habitat were verified. The observability of grizzlies in different habitats is an important factor in grizzly sightings. Open areas represent the largest proportion of ground observations while aerial radio locations are represented by very few bears in this habitat type. Time lapse camera sets in the Wyoming national forests yielded 26 bears (five grizzlies and 21 blacks) identified at a total of 16 camera sets maintained for 308 days. Results of a master?s thesis on application of time lapse cameras in bear census studies are discussed. Grizzly bear-livestock interactions are detailed and instances of livestock depredation by grizzlies are documented. There were five known grizzly bear mortalities in the entire Yellowstone population during 1976, including four man-caused and one natural mortalities. Observed production of young was considerably higher in 1976 than in 1975.
![District II Grizzly Bear Progress Report [1977] PDF](https://books.google.com/books/content/images/frontcover/oJsbzwEACAAJ?fife=w80-h100)
Author: Larry Roop
Publisher:
ISBN:
Category : Grizzly bear
Languages : en
Pages : 47
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Book Description
Numbers of grizzly bear sightings and sign observations in 1976 were greater than 1975, but did not reach 1973 and 1974 levels. Census flights in Yellowstone National Park showed a similar trend. Factors influencing sightings and census results other than bear population densities are discussed. A total of 44 sightings and sign observations were recorded. Sightings of grizzlies in marginal or unsuitable habitat were verified. The observability of grizzlies in different habitats is an important factor in grizzly sightings. Open areas represent the largest proportion of ground observations while aerial radio locations are represented by very few bears in this habitat type. Time lapse camera sets in the Wyoming national forests yielded 26 bears (five grizzlies and 21 blacks) identified at a total of 16 camera sets maintained for 308 days. Results of a master?s thesis on application of time lapse cameras in bear census studies are discussed. Grizzly bear-livestock interactions are detailed and instances of livestock depredation by grizzlies are documented. There were five known grizzly bear mortalities in the entire Yellowstone population during 1976, including four man-caused and one natural mortalities. Observed production of young was considerably higher in 1976 than in 1975.
![District II Grizzly Bear Progress Report [1977] PDF](https://books.google.com/books/content/images/frontcover/0Z7-zgEACAAJ?fife=w80-h100)
Author: Larry Roop
Publisher:
ISBN:
Category : Grizzly bear
Languages : en
Pages : 61
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Book Description
The total number of grizzly bear sightings or sign observations increased only slightly in 1977 over 1976 levels for the Shoshone National Forest, but in the Bridger-Teton National Forest the number of observations was more than ten times greater than 1976. This increase in observations was due to increased effort to obtain sightings and increased bear activity. Other factors influencing bear sighting reports, including political and sociological aspects, are discussed. A total of 126 sightings or sign observations are listed. Increased hunting camp problems and livestock conflicts with grizzly bears are discussed. Higher than usual mortality occurred during 1977, totaling 12 bears in the Yellowstone population. Five of the mortalities were female grizzlies with two cubs or two yearlings each. The influence of large ungulates killed on highways and left to attract grizzlies is thought to be responsible for at least two of the mortalities.
Author:
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ISBN:
Category : State libraries
Languages : en
Pages : 640
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Book Description
Author: John Johnson Craighead
Publisher:
ISBN:
Category : Bears
Languages : en
Pages : 28
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Book Description
Delineates a critical habitat for grizzly bears in the Yellowstone region by defining spatial requirements and habitat use, and by identifying threats to the habitat.
![District II Grizzly Bear Progress Report [1980] PDF](https://books.google.com/books/content/images/frontcover/Gdr_zgEACAAJ?fife=w80-h100)
Author: Larry Roop
Publisher:
ISBN:
Category : Grizzly bear
Languages : en
Pages : 33
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Book Description
Grizzly bear sightings and sign observations were lower for 1979 in the Shoshone National Forest than in past years of the study. Other types of data indicate that bear activity in this area was not abnormally low, and some sociological or political factors that might have influenced sighting numbers are discussed. In the Bridger-Teton National Forest there were marked increases in fall sightings of grizzly bears, particularly in the Thorofare and upper Yellowstone drainages. Changes in human-use patterns may have influenced these sightings. Associated with this increased bear activity were 15 reported incidents of grizzly bears into hunting camps and two incidents of grizzlies claiming hunters? elk outside of camps. There were three known and six suspected mortalities during 1979. Two of the known and three of the suspected bear losses were associated with livestock conflicts. Present grizzly bear production ratios, when compared to periods prior to this study, indicate a slightly lower cub:female ratio but a higher yearling:female ratio. This would indicate lower grizzly bear reproduction but higher cub survival.
Author:
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ISBN:
Category : Grizzly bear
Languages : en
Pages : 260
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Book Description
Provides scientists, educators, managers, and the interested public with the most advanced knowledge and technology regarding grizzly bear - habitat interrelationships.
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ISBN:
Category : Forests and forestry
Languages : en
Pages : 312
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Book Description
![District II Grizzly Bear Progress Report [1982] PDF](https://books.google.com/books/content/images/frontcover/ja_-zgEACAAJ?fife=w80-h100)
Author: Larry Roop
Publisher:
ISBN:
Category : Grizzly bear
Languages : en
Pages : 61
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Book Description
Weather for 1982 was normal and in most areas there was more precipitation than in 1981. A heavy spring winterkill of ungulates and adequate bear food production during the summer resulted in less grizzly bear-human conflicts in 1982 than in 1981. There were 19 grizzly bear relocations in 1982 compared to 32 in 1981. There were 30 management related grizzly bear captures, most near Cooke City and Silvergate, MT. Fewer backcountry camp problems were reported and there were no known livestock problems with grizzly bear this season. Only one grizzly bear mauling was reported this season compared to seven attacks last season. A minimum population estimate of 183 to 207 grizzly bear for 1980 has been computed from IGBS data by a special committee on population analysis. The committee calculated a slight downward trend for the Yellowstone population from 1974-1982.
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ISBN:
Category :
Languages : en
Pages : 270
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Book Description
![District II Grizzly Bear Progress Report [1983] PDF](https://books.google.com/books/content/images/frontcover/R-EUzwEACAAJ?fife=w80-h100)
Author: Larry Roop
Publisher:
ISBN:
Category : Grizzly bear
Languages : en
Pages : 59
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Book Description
Weather for 1982 was normal and in most areas there was more precipitation than in 1981. A heavy spring winterkill of ungulates and adequate bear food production during the summer resulted in less grizzly bear-human conflicts in 1982 than in 1981. There were 19 grizzly bear relocations in 1982 compared to 32 in 1981. There were 30 management related grizzly bear captures, most near Cooke City and Silvergate, MT. Fewer backcountry camp problems were reported and there were no known livestock problems with grizzly bear this season. Only one grizzly bear mauling was reported this season compared to seven attacks last season. A minimum population estimate of 183 to 207 grizzly bear for 1980 has been computed from IGBS data by a special committee on population analysis. The committee calculated a slight downward trend for the Yellowstone population from 1974-1982.
