Abstract
Diversity and distribution of Phytoplanktons was studied in Dourachour of Madhepura district. Collected Phytoplanktons belonged to class Chlorophyceae, Cyanophyceae, Bacillariophyceae and Euglinophyceae. Altogether 50 species of Phytoplanktons were identified, 20 from Chlorophyceae, 16 from Cyanophyceae, 9 from Bacillariophyceae and 5 from Euglinophyceae. Chlorophyceae contributed 40% of the total phytoplanktons, Cyanophyceae 32%, Bacillariophyceae 18% and Euglinophyceae 10%. Maximum number of Phytoplanktons was recorded in the month of August and minimum in the month of June, Chlorophyceae showed maximum number in the month of August, Cyanophyceae in the month of May, Bacillariophyceae in the month of January and Euglinophyceae in the month of October. Boyd's diversity index was greater than 4 in every month which show that water of chour is clean. . KEYWORDS :Dourachour, Phytoplankton, Diversity and distribution, Chlorophyceae, Cyanophyceae, Bacillariophyceae and Euglinophyceae.
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