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Application of Family Biotic Index in Assessment of two Rivers Affected by Oil Pollution in Assam, India

Author Affiliations

  • 1 Dept. of Life Sciences, Dibrugarh University, Assam, India

Int. Res. J. Environment Sci., Volume 5, Issue (11), Pages 35-40, November,22 (2016)

Abstract

By using Family Biotic Index (FBI) two rivers viz. Dhansiri and its tributary river Kaliani were assessed from March, 2012 to February, 2014, dividing the entire period into four seasons as pre monsoon, post monsoon and winter. These two rivers were affected since its operation from the year, 2000 by the Numaligarh Oil Refinery of Assam. In the study, 23 genera and 2 tribes (Chironomidae family) belonging to 25 families of macro invertebrates have been recorded belonging to ten orders, four classes and three phyla. The annual FBI values were found to be lowest for the control area of Kaliani and most of the macro invertebrates that were found in that control area were relatively pollution intolerant. On the other hand, the point of effluent discharge (S6) of contaminated area receiving the refinery effluents with the highest FBI value has shown “Very poor” water qualities with severe organic pollution likely as the most of contributing families were highly tolerant to organic pollution.

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