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Limnological Notes on Ramsagar, Dinajpur, Bangladesh

MONIRUZZAMAN KHONDKER
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

MD ALMUJADDADE ALFASANE
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

MD ATAUL GANI
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

MD SHAFIQUL ISLAM
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

It showed that the mean alkalinity, DO, pH, TDS and conductivity of the lake were 0.50 meq/l, 7.99 mg/l, 6.73, 10.66 mg/l and 73.66 μS/cm, respectively. The water quality data of Ramsagar have been compared with those of Joysagar and it has been observed that the mean alkalinity of water is almost same in both the water bodies. But the mean values of conductivity, SRP and SRS are lower in Ramsagar, which are 1.47, 25.27 and 14.84-fold higher, respectively in Joysagar. Mean nitrate concentration in Joysagar was found to be 97.70 μg/l. On the other hand, this was below 0.1 mg/l in Ramsagar.

Keywords: Ramsagar, Phytoplankton, Water quality

Location: Ramsagar, an artificial lake of Dinajpur district

Start Date: 00-04-2011

End Date: 00-04-2011

Program Area: Conservation and Biodiversity

Commodity: Plankton

Objectives:

The present attempt has been made to study the water quality and the status of phytoplankton community of Ramsagar.

Methodology:

Ramsagar is 1.03 km long and 0.36 km wide and is located on a 60 ha elevated land which is about 8 km south of Dinajpur city. The area of the water body is 31.53 ha having an average depth of 9.14 m. The catchment is occupied by secondary forests and managed by the forest department of Bangladesh and the lake is taken care by the fisheries department. The area has been considered as tourist spot and nearly 150000 tourists visit the area every year. Water sample from 10 cm depth was collected by dipping a two litre capacity polystyrene bottle from the southern part of the lake on 24 April, 2011. The bottle was covered by dark papers and carried to the laboratory for further analyses. Triplicate Pyrex BOD bottle (125 ml cap.) was filled in situ and fixed by adding each of 1 ml of manganous sulphate and alkaline iodide solution for DO analysis. Another one litre sample of the lake was fixed by adding Lugol's solution for the qualitative and quantitative analyses of phytoplankton. All the samples were transported to the Hydrobiology and Limnology laboratory, Department of Botany, University of Dhaka and the chemical analysis was completed within next 24 hours. Methodologies followed have been described.

Source of Information: Bangladesh J. Bot. 41(1): 119-121, 2012 (June)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The limnological information of the present study is based on the analysis of a single sample, it only reflects the water quality at a given time. However, by comparing the data of previously studied water bodies and dominance of desmid flora the present water body may be suggested to be acidic in nature and also nutrient poor. Among macrophytes Nymphoides cristatum (Roxb.) O. Kuntze and Aponogeton appendiculatus Bruggen were found to be dominant during the present investigation.

Knowledge Management: Journal