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Viewed one at a time, Water Lettuce does not appear to be much of threat.

But packed together, it can lead to a lower concentration of oxygen in covered waters and sediments by blocking air-water interface and root respiration. Extremely thick mats of water lettuce can even prevent sunlight from reaching underlying water. The cumulative effect of these negative characteristics of the plant is a loss of biodiversity in invaded habitats.

2007 by Peter Schulz