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Hazarika, Lakhi Prasad
- Status, Distribution and Conservation Threats of Endangered Cetacean Platanista gangetica gangetica Roxb. in Subansiri River, Northeastern India
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Authors
Affiliations
1 Department of Zoology, North Lakhimpur College, North Lakhimpur-787 031, Assam, IN
2 Department of Botany, Lakhimpur Girls' College, North Lakhimpur-787 031, Assam, IN
1 Department of Zoology, North Lakhimpur College, North Lakhimpur-787 031, Assam, IN
2 Department of Botany, Lakhimpur Girls' College, North Lakhimpur-787 031, Assam, IN
Source
Nature Environment and Pollution Technology, Vol 9, No 4 (2010), Pagination: 791-798Abstract
Critically endangered Ganges River Dolphin (Platanista gangetica gangetica Roxb.) is found in substantial numbers in the downstream of Subansiri river, a major tributary of the River Brahmaputra. Best estimates of 21, 23 and 26 dolphins were recorded in 2005-06, 2006-07 and 2007-08 respectively. Until recently, the Subansiri river was considered one of the safe havens for residential dolphin due to relatively healthy downstream environment coupled with awareness of river bank inhabitants. Water environment of the un-damming Subansiri river strongly influence the existence of dolphin population. However, compositional changes of their distribution may have occurred after regulation of the river by the 2000 MW Lower Subansiri Hydroelectric Projects, whose construction has begun. Only 25 cumec/sec water will be released to the downstream after operation of the project against the present minimum flow discharge of 188 cumec/sec. This huge irreversible reduction (87.60%) in water discharge will make the downstream extremely vulnerable for this IUCN's red listed mammal, the dolphin. Flushing of reservoir sediment will accelerate the degradation by increasing, decreasing the riverbed and water table respectively. To protect the ecological and social security of the downstream, in general, and Ganges dolphin in particular, the minimal environmental flows for long term sustaining of the recently declared India's national aquatic animal is to be calculated and executed accordingly.Keywords
Dolphin, Downstream, Hydroelectric Project, Northeast India, Subansiri River.- Pre-Impact Studies of the 2000 MW Lower Subansiri Dam on Certain Aquatic Environmental Aspects of Downstream of the River Subansiri with Special Reference to Plankton and Fishes
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Authors
Affiliations
1 Department of Botany, Lakhimpur Girls' College, P.O. Khelmati, Lakhimpur-787 031, Assam, IN
2 Department of Botany, Gauhati University, Guwahati, Assam, IN
3 Department of Zoology, North Lakhimpur College, Assam, IN
1 Department of Botany, Lakhimpur Girls' College, P.O. Khelmati, Lakhimpur-787 031, Assam, IN
2 Department of Botany, Gauhati University, Guwahati, Assam, IN
3 Department of Zoology, North Lakhimpur College, Assam, IN
Source
Nature Environment and Pollution Technology, Vol 9, No 2 (2010), Pagination: 283-291Abstract
Pre-impact studies of the 2000 MW lower Subansiri dam have been carried out from January 2006 to December 2006 on certain hydrobiological aspects of downstream of the river Subansiri viz., physicochemical parameters, phytoplankton, zooplankton and freshwater fish diversity. The water quality is suitable for planktonic and fish diversity. In thedownstreamof proposed dam, a total of 199 taxa have been recorded and identified which include 48 species of algae, 23 species of zooplankton, and 128 species of freshwater fishes belonging to 9 orders, 27 families and 78 genera.Keywords
River Hydrobiology, Plankton, Fishes, Subansiri River Dam.- Probable Downstream Impacts of 2000 MW Lower Subansiri Dam in Arunachal Pradesh of North East India
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Authors
Affiliations
1 Department of Botany, Lakhimpur Girls College, Lakhimpur-787 031, Assam, IN
2 Department of Zoology, North Lakhimpur College, Lakhimpur-787 031, Assam, IN
1 Department of Botany, Lakhimpur Girls College, Lakhimpur-787 031, Assam, IN
2 Department of Zoology, North Lakhimpur College, Lakhimpur-787 031, Assam, IN