Vol. 2, Issue 6 (2017)
Study the wetland water quality using biotic indexes: A case study of Asan wetland of central Himalaya
Author(s): Gulzar Ahmad Bhat, RK Jauhari, Manzoor Ahmad Paray, N Pemola Devi
Abstract: The Himalayan region is dotted with hundreds of freshwater resources in the form of lakes and wetlands. These freshwaters were affected by an adverse effect of the environment. The present study aims to analyze the health of Asan wetland of central Himalaya by using various biotic indexes. The most polluted waters are presently restricted to summer season of the wetland. Samples were collected seasonally over a period of one year (2016) at four sampling sites. A total of 20 families of macroinvertebrates were collected with the Notonectidae and Baetidae being the most abundant component of macroinvertebrate communities. The absolute values of the biotic indices showed high spatio-temporal variation, the BMWP, ASPT scoring proved useful because water quality were changed throughout the seasons. The abundance of different classes of macroinvertebrates decreased from Hemiptera 35% to Plecoptera 0% and the total density of macroinvertebrates in different seasons are lowest in summer season 15%, but highest in winter season 31%. The statistical relationship between air temperature, water temperature, pH, dissolved oxygen and the density of macroinvertebrates were also analyzed to ensure the affect of these physiochemical parameters upon the macroinvertebrates. The macroinvertebrate community relying on the benthic substrate of Asan wetland is still poor, and the water quality was still moderately polluted.