Trakroo, Malobica DasBisht, Vivek Singh2019-08-102019-08-102019-07http://krishikosh.egranth.ac.in/handle/1/5810120785The present study was conducted to assess the periphyton density of Baur reservoir of Uttarakhand. Baur reservoir is located in the Gadarpur and Bajpur developmental blocks of Udham Singh Nagar in the Tarai region of Uttarakhand. The study deals with the estimation of limnological parameters of the reservoir and qualitative and quantitative analysis of periphyton community. Biodiversity of the periphytic community has been estimated using several biodiversity indices. For the study, three sampling sites S1(Dam barrage), S2(Sluice), and S3(Cove) were selected which were at a distance of about 3km from each other. Samples were collected fortnightly to evaluate the water quality and periphyton community for a period of 7 months from October, 2018 to April, 2019. The range of physical parameters i.e. water temperature, transparency, electrical conductivity and total dissolved solids during the study period was 19.03±0.31 to 30.00±0.20 °C, 123.33±3.51 to 134.33±8.14 cm, 301.33±1.53 to 321.67±4.15 μS/cm and 198.67±1.53 to 228.67±1.53 mgL-1 respectively. During the research period chemical parameters like pH, dissolved oxygen, free CO2, total alkalinity, NO3-N and PO4-P levels were found to be in the range of 7.33±0.12 to 7.90±0.17 mgL-1, 4.77±0.21 to 6.37±0.12 mgL-1, 0 ± 0.00 to 4.33±1.15 mgL-1, 174.67±11.72 to 224.67±5.03 mgL-1, 0.22±0.03 to 0.40±0.02 mgL-1 and 0.03±0.01 to 0.07±0.00 mgL-1 respectively. The species composition of periphytic community of Baur reservoir consists of a total number of 34 periphytic taxa belonging to different groups namely Bacillariophyceae (15), Chlorophyceae (13), Cyanophyceae (2), Xanthophyceae (1), Euglenophyceae (1) and other groups including Protozoa (1) and Rotifera (1). The periphyton density ranged from 42333.33 to 55333.31 individuals/cm2. Group wise distribution of periphyton density revealed that Bacillariophyceae was dominant group followed by Chlorophyceae. Cyanophyceae, Xanthophyceae, Euglenophyceae, Protozoa and Rotifera were recorded seasonally. Maximum diversity of periphyton in Baur reservoir was found during the month of April. The details of above findings of the investigation are presented in different chapters of the thesis.ennullThesis