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Predicting the Spread of Invasive Exotic Plants into De-watered Reservoirs Following Dam Removal on the Elwha River, Olympic National Park, WA
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In 2012, Olympic National Park will begin removal of two dams on the Elwha River and restoration of ecosystems that have been altered for more than 90 years. Specific goals of the project include restoring native migratory fish runs and sediment transport to the coast, maintaining water quality, and re-vegetating former reservoir soil. Preventing the establishment of exotic plants in former reservoirs is the highest priority of Olympic National Park. Establishment of exotic plant species could threaten project goals, for example by inhibiting the establishment of native trees, which would eliminate shade and large woody debris inputs necessary for fish habitat. USGS scientists will identify the most threatening sources of invasive plants in time for park staff to control them and predict which areas of the former reservoirs are most at risk for exotic invasion. These areas would be targeted for the greatest focus of limited resources following dam removal.
Woodward, Andrea - Biologist
Phone: 206-526-6282 x332
Email: andrea_woodward@usgs.gov
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