Your search for keyword(s) "national park service policy" resulted in 1 record(s).

Title: Thunder on the Yellowstone revisited: An assessment of management of native ungulates by natural regulation, 1968-1993: Journal: Wildlife Society Bulletin; Authors: F. J. Singer, D. M. Swift, M. B. Coughenhour, and J. D. Varley; Date: 1998; Summary: Singer et al. reviewed new and previously published data on ungulate numbers and soil and vegetation characteristics in and out of long-term exclosures in Yellowstone National Park (YNP), 25 years after the initiation of the Park's "natural-regulation" management model in 1968. In comparing exclosures with grazed plots throughout Yellowstone's winter range, the authors found little widespread evidence of increased levels of exotic species, greater sediment yield, soil warming or drying, changes in soil nutrients or aboveground standing crop. However, bare ground was 11-18% greater ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article