Volume No. 3 Issue No.: 4 Page No.: 1094-1098 April-June 2009

 

BIOLOGICAL ASSESSMENT OF POLLUTION IN A WATER BODY AT CALCUTTA METROPOLIS (INDIA)

 

Subrata Datta* and Sobhana Paul

Department of Zoology, East Calcutta Girls

 

Received on : May 15, 2009

 

ABSTRACT

 

Pollution studies in a short stretch of Hooghly River within Calcutta Metropolis have been made with an emphasis on the biological assessment of Water Quality. The study deals with the distribution of benthic diversity indices in Hooghly River after a sewage discharge region. The distribution and abundance of the species depended on the load and dilution factors around the sewage outfall region. These indices may be used as Biological Indicators to understand the status of pollution in a Lotic System. The study emphasizes the usefulness of Oligochaeta communities as descriptors of Sewage pollution. Oligochaetes like Limnodrilus hoffmeisteri were abundant only in sewage fed areas and their presence is found to be related with low levels of Oxygen. Reduction in species abundance and abundance of mainly Oligochaetes in the sewage outfall region are also discussed.

 

Keywords : Hooghly River, Benthic diversity, Limnodrilus hoffmeisteri

 

 

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