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Jyoti Verma
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Volume 124 Issue 2 March 2015 pp 383-394
Prakash Nautiyal Asheesh Shivam Mishra Jyoti Verma
This study examines the ecological state of epilithic diatom assemblages along the lower stretch of Mandakini, a glacier-fed Himalayan river. The diatoms were sampled at four stations during winter and summer, only once in each season. Valve counts were obtained from Naphrax mounts prepared from each sample. Assemblages were recorded for each location. The software OMNIDIA Ver. 5.3 was used for computing the ecological values from the sample counts. Normally
Achnanthidium spp. dominated the assemblages, exceptNitzschia fonticola (Grunow) at S1 (Kund) andEncyonema minutum (Hilse in Rabh) at S4 (Rudraprayag), only during summer. The ecological values revealed that the assemblages were in 𝛽-mesosaprobic and mésotraphentic states. However, at S4, trophic state was observed to be eutraphentic. Louis Leclercq index indicated that organic pollution was nonexistent, while the anthropogenic eutrophication was low except at S2 (Tilwara) and S3 (Medanpur) in summer and was moderate at S4 in winter characterized by a lean flow. The most abundant indicator taxa for anthropogenic eutrophication are varied;Cymbella tumida (Brebisson-Van Heurck) at S1,Encyonema minutum at S2, S4 whileSurirella aungusta (Kutzing) at S3. Ordination showed that the taxa indicating degradation and anthropogenic eutrophication figured as characteristic taxa at respective locations.
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Journal of Earth System Science
Volume 132, 2023
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