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Image Number K11418-1
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Giant salvinia grows so thick it forms mats that block out sunlight and use up
oxygen in lakes and ponds. Here, in a greenhouse, Student Conservation Association
intern Melissa Martin and entomologist Philip Tipping record giant salvinia biomass.
Photo by Peggy Greb.
640 pixels wide: (k11418-1.jpg)
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Last Modified: 05/23/2006
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