Seasonal variation in algal diversity and productivity in Dachi lake Seasonal variation in algal diversity and productivity in Dachi lake, Meghalaya

Pranita Hajong, Papiya Ramanujam
J. Algal Biomass Utln   unpublished
Seasonal variation in algal diversity and productivity in Dachi lake was carried out from September 2015 to August 2016. Dachi lake is well known tourist spot in West Garo Hills. It is maintained by Soil and Water Conservation Department of Meghalaya. A total of 176 algal species belonging to 8 classes were recorded. A distinct seasonal variation in diversity was observed, which varied from 1.45 in summer to 3.1 in spring. Primary productivity was also maximum in spring (3.07 gC/m 3 /h) and was
more » ... gC/m 3 /h) and was minimum in summer (0.97gC/m 3 /h). Seasonal variation in physico-chemical parameters was observed and the nutrients concentration was recorded within the permissible limit of World Health Organization standard. Pearson's correlation analysis revealed that primary productivity positively correlated with pH, transparency and dissolved oxygen and negatively correlated with turbidity and nutrients. It can be concluded that productivity in Dachi lake is driven by transparency of the water which allowed light to penetrate and promote productivity. Diversity indicated the clean status of the lake. The lake is maintained well by the Soil and Water Conservation Department hence pollution caused by the tourist was negligible. The changes in physico-chemical parameters, algal community and primary productivity are mainly due to seasonal changes.
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