Volume No. 8 Issue No.: 3A Page No.: 786-795 Jan-Mar 2014

 

A STUDY ON MACRO-INVERTEBRATE POPULATION IN RELATION TO SOME WATER AND SOIL QUALITY PARAMETERS IN THE WETLANDS OF LOWER SUBANSIRI BASIN, INDIA

 

Doley N.* and Kalita S.

Department of Environmental Science, Gauhati University, Guwahati, Assam (INDIA)

 

Received on : September 15, 2013

 

ABSTRACT

 

The wetlands of the Lower Subansiri basin have been reported to be deteriorating due to ever increasing exploitation of resources available in the wetlands and human intervention in their natural functioning. As macro-invertebrates are regarded as one of the indicators of the health of a wetland, in the first stage of investigation on the health of the wetlands in the basin, the macroinvertebrate populations in four selected wetlands belonging to four different types of wetlands, namely Oxbow, Lake/Pond, Waterlogged and Riverine were studied and the results were interpreted in relation to some water and soil quality parameters of the respective wetland. It was observed that the Ephemeroptera, Plecoptera, Trichoptera (EPT) Richness Index in the four different types of wetlands with Cumulative Index value (CIV) ranging from 6-21 indicated water and soil quality from good to poor. Cumulative Index Value (CIV) of 21 and 19 (17-22? good) was observed in the Waterlogged and Oxbow type wetlands. The other two categories of wetlands viz: Riverine and lake/pond had fairly dense macro-invertebrates with a fair cumulative index value, but not with convincing values of water and soil quality parameters. Organic matter was found highest in the lake/pond type with very low DO and pH. Shannon Weiner Diversity Index of macro-invertebrates ranged from 2.00 to 2.38 showing a good diversity of macroinvertebrates in the wetlands.

 

Keywords : Lower Subansiri Basin, Wetlands, Water and soil quality, Bioindicators, Macro-invertebrates, Cumulative index value, Shannon Weiner diversity index

 

 

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