Salix spp.), aspen (Populus tremuloides) and Wyoming big sagebrush (Artemisia tridentata tridentata), already uncommon prior to 1968, continued to decline under the policy of natural regulation. They conclude that the natural-regulation model for YNP was flawed in its assumptions of a single, steady state for the park, based on conditions presumed to exist in 1870 prior to establishment of the national park. The period selected as a standard (1870) was an unusual period characterized by frequent large fires and floods, common wolves, few elk, and a cooler, wetter climate." />
Range Science Information System (RSIS) - Montana State University Library

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Thunder on the Yellowstone revisited: An assessment of management of native ungulates by natural regulation, 1968-1993