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Image Number K9651-7 Giant salvinia is a fast-growing fern that can clog ponds and lakes. Forming mats up to 2 feet thick, the plant gobbles up oxygen and blocks sunlight needed by other water dwellers. A tiny weevil, Cyrtobagous salviniae, is under study as a biocontrol for this obnoxious invader. Photo by Scott Bauer.  640 pixels wide: (k9651-7.jpg)   Please visit our Image Gallery


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