of Baskandi anua, an oxbow lake of South Assam,
and S. Sushila Devi
Ecology and Environmental science, Assam University, Silchar-788 011, India
Authors Email : Susmita.email@example.com
01 August 2012
25 December 2013
13 January 2014
study was made on the physico-chemical properties of water and phyto and
zooplankton communities of Baskandi anua, an oxbow lake of South Assam during
March to August, 2009. Analyses of water showed acidic to slightly alkaline
pH (5.4 - 7.9) with dissolved oxygen ranging from 4.26 to 11.83 mgl-1
and total alkalinity from 31.25 to 65 mg l-1, indicating the
productive nature of water. Free CO2 fluctuated from 2.93 to 15.04 mgl-1.
PO4 and NO3 concentration ranged from 0.15 to 1.4 mg l-1 and 0.06
mg l-1 to 4.94 mg l-1, respectively. Conductivity, pH
and free CO2 were found higher at the sites surrounded by paddy fields. Mean
values of physico-chemical parameters significantly varied between the sites
and were found to be influenced by one or more of the following factors viz.
rainfall, depth and influx from adjacent paddy field. A total of 30
phytoplankton taxa and 12 zooplankton taxa with qualitative dominance of
Chlorophyceae were recorded. The study revealed that water quality of the
lake was good for aquaculture. Hence, the lake should be protected and best
management practices should be implemented for sustainable production.
Ecology, Plankton communities, Oxbow lake
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