RT Journal Article
ID 720dd31658994559
A1 Shylla, Ophilia
A1 Ramanujam, P.
T1 Effect of Nutrients on Diversity of Algae in Marngar Lake, Meghalaya (India)
JF International Journal on Algae
JO IJA
YR 2013
FD 2013-08-14
VO 15
IS 3
SP 239
OP 250
K1 species diversity
K1 trophic status
K1 compound index value
AB Marngar Lake in Meghalaya is an attractive picnic spot situated between hilly slopes. Recently, a plantation of tea on one hilly side, the cultivation of agricultural crops on the other side, and the use of lake water by the neighboring people for domestic purposes have resulted in the deposition of agricultural and domestic wastes, bringing a noticeable change in the physical and chemical
components of the lake. The present paper is an attempt to focus the effect of the level of nutrients in the lake on the distributional pattern of algae in different seasons. A total of 111 species could be recorded in different seasons from the lake. Maximum number of algal species in the lake was recorded in winter (102) but species diversity was highest in the monsoon (2.2) season due to fast growth rate. Bacillariophyta group was the dominant group in all seasons followed by Chlorophyta. Representation of Chlorophyta by desmids, mainly Closterium, Cosmarium and Euastrum, and Bacillariophyta by genera like Cymbella, Gomphonema, Navicula, and Pinnularia indicated the optimum level of nutrients which favoured diverse algal communities. High diversity due to fast growth rate during the monsoon season could be correlated to higher temperature and higher levels of calcium, magnesium, and nitrate entering the lake from the neighboring areas. Compound index value calculated confirmed the mesotrophic nature of the lake.
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