Predicting Grizzly Bear Density in Western North America

摘要: Conservation of grizzly bears (Ursus arctos) is often controversial and the disagreement focused on estimates density used to calculate allowable kill. Many recent bear are now available but field-based will never be for more than a small portion hunted populations. Current methods predicting in areas management interest subjective untested. Objective have been proposed, these statistical models so dependent results from individual study that do not generalize well. We built regression relate ultimate measures ecosystem productivity mortality interior coastal ecosystems North America. 90 ecosystems, which 14 were currently known unoccupied by bears. In areas, we 17 including 2 areas. Our best model included negative relationship with tree cover positive relationships proportion salmon diet topographic ruggedness, was correlated precipitation. 3 variables indexed terrestrial productivity, 1 describing vegetation cover, indices human use landscape and, an index ruggedness. our predict current population sizes across Canada present as alternatives estimates. fewer British Columbia latest status review. These predictions can assess status, set limits total human-caused mortality, conservation planning, because static, they cannot trend.