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Biota of Lakes
Lakes exhibit life zones. So far you have been reading about the vertical zonation of lakes. The lakes can be divided into horizontal zones as well. This division is on the basis of life forms existing in lakes. The penetration of sunlight in the lake influences the vertical gradient of sunlight, temperature and oxygen. The horizontal gradation of lakes is affected by distribution of organisms in the waters. These results in definite zones are as follows:
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