Ecology, Distributional Pattern and Diversity of Algae in Umiam Reservoir
Author(s): Dr. Pranita Hajong, Dr. Papiya Ramanujam
Abstract: The present work was under taken to assess the algal flora, their ecology and distributional pattern of algal community in Umiam reservoir. Three sites were selected for sampling based on different criteria that is two rivers joining the Umiam lake known as rivers entrance area; exposed to anthropogenic activities known as disturbed area and away from human activities known as undisturbed area. A total of 211 algal species spreading over 6 classes were recorded from three different selected sites. The algal community structure in Umiam reservoir was dominated by Bacillariophyceae followed by Zygnematophyceae, Chlorophyceae, Cyanobacteria, Euglenophyceae and Trebouxiophyceae. Species diversity was high in undisturbed area with 3.41 and confirmed the oligo-mesotrophic nature and supports the growth of Chlorophyceae and Zygnematophyceae member. On the other hand higher concentration of phosphate and nitrate in rivers entrance area influenced the growth of Cyanobacteria and Euglenophyceae. Based on the Trophic diatom index rivers entrance area is in eutrophic state. Hence appropriate measures need to be taken to restore the pristine nature of the reservoir.