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Sandy River, Northern Oregon
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The Nehalem River: near Oregon's coast, this watercourse is heavily invaded by knotweeds. The
dense growth carpets the interface between the forest and the stream. The ecosystem is greatly changed as a result. (Photograph courtesy of Doug Kreuzer.) |
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The Global Invasive Species Team |  |
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Updated January 2005
©The Nature Conservancy, 2000