Abstract
Ecological problems arising as a result of rapid growth of S. natans Hoffim in some lakes of Kashmir have been studied. High viability of spores coupled with rapid vegetative propagation seem to be responsible for the spread of the weed. Lake channels protected from wind by a canopy of trees are the most favourable situations in which Salvinia produces a thick mat. Water in these channels is rich in nutrients. Oxygen poor layers of water beneath the mat are detrimental for insect and fish life. Besides, the changing light conditions have profound influence on the submerged vegetation. The most common associates of Salvinia are Hydrocharis dubia and Ceratophyllum demersum.
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