Polyphenolics and Energy Content in Phytoplankton: Evidence from a Freshwater Lake
Tóm tắt
Investigation was carried out in the ancient man-made, shallow, freshwater lake, Lake Krishnasayer, at Burdwan (23°16′N, 87°54′E), India, to note the variations in physico-chemical parameters, nutrients, phytoplankton communities, concentration of phenols and energy content in phytoplanktons during January–December 2006. The lake was represented by 16, 15, 2 and 17 genera of Cyanophyceae, Chlorophyceae, Euglenophyceae and Bacillariophyceae, respectively with significant variation in relative abundance as was revealed through Discriminant Analysis. Wilk’s λ values indicate that nitrate, phosphate, dissolved chlorides and silica, and phenol content were significant (P < 0.05) predictor for such differences. PCA analysis yielded three components explaining more than 68 % of the variations in the data on physico-chemical parameters, nutrients, phenol concentration and energy content of total phytoplankton. The interactions of the environmental variables contribute significantly to the observed variations in the phenol and energy content of the phytoplankton. However, the phenomenon of temporal variation in the total phytoplankton and energy content is accounted as a function of nitrate, phosphate-phosphorous, silicate and organic carbon levels. It is apparent that this quality of phytoplanktons varied with the seasons and thereby influencing the amount of phenol and energy content in the engulfing phytoplanktons. Therefore, adequate allocation is needed regarding nutritional status of phytoplanktons, in respect to the dietary need of aquaculture programme in practice.
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