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Seasonal Dynamics of Plankton in Relation to Some Environmental Factors in Abeel Ecosystem

M.M.R.Chowdhury
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh

M.R.K.Mondol
Department of Fisheries, University of Rajshahi, Rajshahi

S. Dewan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Seasonal dynamics of plankton, water temperature, conductivity, pH, total alkalinity, phosphatephosphorus and nitrate-nitrogen of Burulia beel were measured. These values were within the acceptable ranges. In the present study, water temperature, pH, Nitrate-nitrogen, Phosphate-phosphorus were found to range from 13.50 to 30.50°C, 6.21 to 7.33, 1.36 to 2.85 mg/l and 0.07 to 0.71 mg/l, respectively. The range of total plankton was from 12.67×105 to 80.83×105 cells/l with mean value 29.71±19.98×105 cells/l. A total of 47 genera of plankton was recorded belonging to Chlorophyceae, Bacillariophyceae, Cyanophyceae, Euglenophyceae, Dinophyceae, Crustacea and Rotifera. Among phytoplanktonic Chlorophyceae was the most dominant group contributing 46% of the total. Cyanophyceae was the least dominant group. From zooplankton, Crustacea was the most dominant group contributing 71% of the total zooplankton. The greatest abundance of phytoplankton was recorded in September to November with an average number 70.67×105 cells/l and the minimum in April with an average number 38.33×105 cells/l. The abundance of zooplankton showed two peaks, one in the months of August-October and another in the months of April-June. Phytoplankton and zooplankton have a direct relationship with each other.

Keywords: Burulia beel, phytoplankton, zooplankton

Location: Gaibandha

Start Date: 01-07-2003

End Date: 30-06-2004

Program Area: Resource Development and Management

Commodity:

Objectives:

To know the composition and abundance of plankton population and monthly changes of some water quality parameters as well as plankton population of Burulia beel

Methodology:

Burulia Beel located at Gobindaganj Upazila under Gaibandha district. It is a semi-closed waterbody with three inlets and outlets. Of these three inlets, to are connected with two canals and one with floodplain. These inlets are screened during rainy season to prevent the escape of stocked fish. The basin depth of Burulia Beel ranged from 0.34 -2.74 m (ARDMCS, 2003). Phytoplankton and water samples were collected monthly from July, 2003 to June 2004 from six different sites of the Beel. Sampling was carried out between 9.00 and 11.30 am. Ten liter water was collected from each site by a plastic bucket and kept on wooden boat. Water temperature, pH and conductivity were measured directly from the collected water using a digital water proof pH, EC/TDS and temperature meters (HANNA instruments, model: HI 98129- HI 98130, Italy). Then 100 ml sample of previously collected water of each site were taken in a bottle and NO₃-N were measured directly from reading of spectrophotometer HACH water analysis Kit (HANNA instrument, model HI 93728, Italy) with one packet of HI 93728 reagent for 10 ml filtered water samples. The concentration of phosphatephosphorus was measured directly from reading of spectrophotometer HACH water analysis Kit (HANNA instrument, model HI 93713, Italy) with one packet of HI 93713 reagent for 10 ml filtered water samples For plankton analysis, the collected 10 liter water was filtered through plankton net of 10, 30 μ mesh size and finally concentrated to 20 ml. The filtrates were then immediately preserved in 5% buffered formalin for subsequent studies. Microscopic identification upto genera was performed following the standard manual. Each sample was stirred well just before microscopic examination. One ml of stirred sample was transferred to Sedgewick-Rafter cell (S-R cell) with a wide mouth pipette. Identification and enumeration were done by a compound microscope (NOVA 950 ES). All the plankton present in randomly chosen 20 squares grids of S-R cell was counted. The mean of three counts was then calculated for each plankton component occurring in the total count. Finally the quantitative counts of phytoplankton were done according to Rahman (1992) and expressed in cells/L. Qualitative studies were done after Peenak (1953), Ward & Whipple (1954), Needham &Needham (1962), Prescott (1964), APHA (1992) and Bellinger (1992).

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 55-58 ISSN 1023-6104

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In Burulia Beel, Chlorophyceae was dominant phytoplankton and Cyanophyceae was least dominant. The population dynamics of zooplankton ranged 33.3×104-11.50×105 cells/l with a mean value of 96.3±28.6×104 cells/l. In the present study, Crustacea was the most dominant group in Burulia Beel (73%). Total zooplankton populations showed two peaks, one in September and another in April. In the present investigation, both phytoplankton and zooplankton showed direct relationship. During the study period zooplankton growth cycle was noticeably less than the phytoplankton abundance almost throughout the study period.

Knowledge Management: Journal