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Twenty-one chapters from the first major symposium to address this important and ever-expanding issue. Covers various aspects of one of the greatest short- and long-term threats to our native biota and landscapes. The magnitude of the problem in the U.S. and abroad, together with the urgent need for action, is driven home by this collection of essays dealing with aquatic and terrestrial systems, with specific focus on causes, case studies, control measures, management practices, ecologic and economic consequences, and policy. A valuable reference for any biologist or natural resource manager.