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Physico-chemical characteristics of Asan wetland with reference to Avian and Molluscan diversity, Doon Valley (Uttarakhand), India

Author Affiliations

  • 1Department of Environmental Science, Baba Farid Institute of Technology, Dehradun–248007, India
  • 2Department of Environmental Science, Baba Farid Institute of Technology, Dehradun–248007, India

Int. Res. J. Environment Sci., Volume 8, Issue (3), Pages 1-11, July,22 (2019)


The Asan wetland attract very large number of tourists in winter season because Asan wetland derived optimum ecosystem which are responsible to attraction of great number of migratory birds and provide natural habitat of migratory birds as well as residential birds. Since this wetland are located in southern latitudes, so it′s attracted great level of birds at winter season that breed in Europe & Northern Asia. Its water is used for irrigation, boating and recreation. In view of these all facts of the Asan wetland, this study has been undertaken to mention attention to the water quality, avifaunal diversity and molluscan diversity of Asan wetland. The physico-chemical characteristics of Asan wetland, as like water temperature recorded in the range of ±0.15 to ±0.11°C, pH ±0.20 to ±0.15, Conductivity ±0.050 to ±0.097µmhocm-1, TDS ±0.57 to ±1.0mg/l, Free CO2 ±0.05 to ±0.25mg/l, DO ±0.49 to ±0.55mg/l, BOD ±0.49 to ±0.36mg/l, TH ±0.01 to ±0.57mg/l, Calcium ±0.01 to ±0.05mg/l, Magnesium ±0.01 to ±0.06mg/l. The Sodium ±0 to ±0.1mg/l, Potassium ±0.01 to ±0.01mg/l, Nitrate ±0.06 to ±0.02mg/l and Phosphate ±0.03 to ±0.01mg/l were recorded in all zones. The avian diversity of the Asan wetland revealed that a total of 49 species observed at all zones in winter season. The great numbers of birds were recorded in morning time in zone– 4, highbirds′ richness observed in Zone- 3. The molluscan fauna of Asan wetland includes 8 families, 8 genera and 9 species recorded at all zones during study period. Significant changes in freshwater snail assemblages were primarily due to changes in the water quality from locality to locality.


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