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Adult bear model

One of the principal factors that have reduced grizzly bear populations has been the creation of human access into grizzly bear habitat by roads built for resource extraction. Past studies have documented mortality and distributional changes of bears relative to roads but none have attempted to estimate the direct demographic impact of roads in terms of both survival rates, reproductive rates, and the interaction of reproductive state of female bears with survival rate. We applied a combination of survival and reproductive models to estimate demographic parameters for threatened grizzly bear populations in Alberta. Instead of attempting to estimate mean trend we explored factors which caused biological and spatial variation in population trend. We found that sex and age class survival was related to road density with subadult bears being most vulnerable to road-based mortality. A demographic model found strong spatial gradients in population trend based upon road density.
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NSFW /Adult Anthro Bear model

Fossil records and historical data indicate that at one time there may have been hundreds of bear species worldwide, on all continents except Antarctica and Australia. Below you will find a photo and a brief description of each of the other seven species. For additional information, see the Additional Reading page. For complete listings and criteria, please visit www. Description: This species is similar in size and appearance to the American black bear, although the fur is longer, soft, and shaggy.
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Conceived and designed the experiments: JB GS. Performed the experiments: GS. Analyzed the data: JB. Wrote the paper: JB GS.
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