International Journal of Ecology and Environmental Sciences
Seasonal variations in Ichthyofaunal assemblage in relation to Physicochemical parameters, Phytoplankton assemblage and Habscore of the Chathe River
Abstract
Density and diversity of Ichthyofaunal assemblage in some selected areas of the Chathe River in Nagaland (India) was investigated for a year in 2014 to survey its seasonal distribution in association with a few selected Physicochemical parameters, Phytoplankton assemblage and Habscore of the stream. Various physicochemical parameters were found to be at recommended ranges of tolerance for Ichthyofauna to flourish in the Chathe River. Phytoplankton assemblage was recorded to be comprised of 56 species under 44 genera of 7 classes in the sampling areas of which Bacillariophyceae and Chlorophyceae were witnessed to be the most abundant classes of phytoplankton in the river. Further, amidst this investigation, 40 species of fishes under 23 genera of 10 families and 4 orders were encountered in the river of which Cyprinidae was found to be the most abundant family followed by Nemacheilidae and Psilorhynchidae throughout the year. Seasonal distribution of Ichthyofaunal assemblage and their diversity or dominance in the river was noticed to be directly influenced by abundance of phytoplankton, since herbivore fishes mostly rely on phytoplankton for their nourishment. Habitat quality was recorded in the range of ‘fair’ to ‘good’ during most of the seasons except monsoon when, Ichthyofaunal assemblage was witnessed to be relatively declined in the river. Further canonical correlation analysis and canonical correspondence analysis has revealed the degree of association of Ichthyodiversity indices and Ichthyofamily abundance with physicochemical attributes, phytoplankton diversity and habscore of the surveyed areas of the Chathe River.
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References
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