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Research Detail

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A.K.M. RASHIDUL ALAMl
Department of Environmental Science, Jahangirnagar University, Savar, Dhaka-1342

A.B.M. ENA YET HOSSAIN
Department of Botany, Jahangirnagar University, Savar, Dhaka-1342.

ABDUL AZIZ
Department of Botany, University of Dhaka, Dhaka-1000

SIRAJUL HOQUE
Department of Soil, Water and Environment, University of Dhaka, Dhaka-lOOO.

Phytoplankton composition and seasonality in relation to chemical conditions of water in six freshwater wetlands of greater Dhaka district was observed during the year, 2000. A total of 77 phytoplankton taxa belonging to Cyanophyceae, Chlorophyceae, Euglenophyceae and Bacillariophyceae were identified. Phytoplankton abundance showed some relationships with the nutrient. Microcystis aeruginosa grew profusely in a wetland with alkaline pH (7.73) during summer. Blue-green algae other than Microcystis aeruginosa increased when the NH4-N was high. Euglenoids showed abundance in a wetland where the amount of dissolved P was low.

  pH, N03-N, P, Phytoplankton, Freshwater, Wetlands
  Six freshwater wetlands of greater Dhaka district
  00-00-2000
  00-00-2000
  Crop-Soil-Water Management
  Water quality

1. The present study was therefore, undertaken to investigate the phytoplankton composition in relation to pH, NH4-N, NO3-N and P of water in some selected freshwater wetlands of greater Dhaka district.

Six freshwater wetlands of greater Dhaka district were selected for this investigation. These are: three wetlands (J1, J2, J3) of Jahangirnagar University campus, one wetland (S) of Dogarmora, Savar, one wetland (B) of Baipail, Dhamsona, Savar and one wetland of Guptapara, Shibpur, Narsingdi (N). The water retention pattern, depth and some of the catchment characteristics of the studied wetlands have been furnished. The wetlands were studied for three seasons namely, summer (March to May), rainy (July to September) and winter (November to January) of 2000. The sampling was carried out at 15 days interval between January and December 2000. Out of the 6 wetlands, JI to h Sand B were visited on the same day, whereas N was visited for sampling on a separate day within a fortnight. To have a representative sample, 1.5 liter water sample was collected from each of the four stations of the wetland at 10:00 am and 5:00 pm and all were mixed together. From this composite sample lliter sample was fixed in Lugols iodine in a glass bottle for phytoplankton sedimentation. Another lliter sample was acidified with Hel and used for the determination of nutrient parameters. However, fresh samples (unacidified) were used to determine the pH. After sedimentation of plankton, water of the bottles was sucked volume was adjusted to 20 ml. For qualitative analysis, the plankton concentrate was observed under a compound microscope (Olympus CH-2) on a glass slide. The phytoplankton specimens were identified at least up to generic level by consulting national and international literatures. For quantitative analysis, 1 ml of well shaken plankton concentrate was taken in a standard Sedgewick Rafter counting cell (SRCC; Model 50, Graticules Limited) and counted following the method of Boyd. The cover glass was placed carefully over the chamber in order to avoid air-bubbles. A total of 10 randomly chosen counting fields of the SRCC were quantified for phytoplankton density in each preparation. The colonial and filamentous algae were treated as a single unit. Finally, the density of phytoplankton was expressed per liter of original water sample. The pH of water was determined by using a glass electrode pH meter (Griffin pH meter, Model No. 40). NH4-N and NO3-N content of water were determined by using Micro-kjeldhal distillation method as described by Jackson. Dissolved phosphorus was determined by ascorbic acid blue colour method. Two way analysis of variance were performed to evaluate variation of pH, NH4-N, N03-N and P content of water in freshwater wetlands.

  Jahangirnagar University Journal of Science, Vol.27, pp. 241-249, 2004
  
Funding Source:
  

A total of 77 phytoplankton taxa belonging to Cyanophyceae, Chlorophyceae, Euglenophyceae and Bacillariophyceae were identified. Phytoplankton abundance showed some relationships with the nutrient. Microcystis aeruginosa grew profusely in a wetland with alkaline pH (7.73) during summer. Blue-green algae other than Microcystis aeruginosa increased when the NH4-N was high. Euglenoids showed abundance in a wetland where the amount of dissolved P was low.

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