Lake Mead National Recreation Area Vegetation Monitoring and Analysis: Quarterly Progress Report, April 1, 2008 to June 30, 2008

Executive Summary The Weed Sentry program surveyed over 182 miles of transportation corridors on federal land in Clark County for incipient populations of exotic plants. Five manuscripts attained published or in-press status this quarter. The published manuscripts are (1) assessing vegetation in grassy remnants of the Las Vegas Valley (Desert Plants), (2) assessing exotic species distributions in Clark County (Environmental Monitoring and Assessment), (3) a synthesis of burro effects on Mojave Desert vegetation (Environmental Management), and (4) examining canopy-tree influences along a soil parent material gradient in (Journal of the Torrey Botanical Society). Staff delivered eight presentations this quarter at conferences, university lectures or agency meetings. A total of 13 permanent sites were established and sampled as part of a microhabitat and distance-from-road invasibility study