Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Temporal Analysis of Phytoplankton Diversity in Relation to Some Physico-chemical Parameters of the River Buriganga

Sumaiya Ahmed
Department of Zoology, Jagannath University, Dhaka1100, Bangladesh

Dulon Roy
Department of Zoology, Jagannath University, Dhaka1100, Bangladesh

Haraj Uddin
Department of Zoology, Jagannath University, Dhaka1100, Bangladesh

Shibananda Shil
University Grants Commission of Bangladesh, Agargaon, Dhaka-1207, Bangladesh

Md. Sagir Ahmed
Department of Zoology, Jagannath University, Dhaka1100, Bangladesh

Abstract/ Executive Summary:

Present study was conducted to compare phytoplankton diversity and their seasonal abundance in relation to some physico-chemical parameters from January to December 2001 in the river Buriganga. Among various chemical parameters dissolved oxygen content was found very low, range from 0.3-5.3 mg/l which is very alarming for aquatic lives in the river. In contrast, free CO2 was high and ranged from 2.1- 183.6 mg/l. The river water was alkaline and hard throughout the period of investigation (pH 7.4 to 9.5, Hardness 145 to 380 mg/l and alkalinity 57 mg/l to 322 mg/l). About 59 species of algae belonging to 35 genera was identified during one year investigation. In the algal community the highest number of taxa belong to Chlorophyta (45.77%), followed by Cyanophyta (18.65%), Euglenophyta (18.65%) and Chrysophyta (16.95%). The dominant groups of algae like Melosira spp. (2779.16 indiv/l) were found throughout the year; other genus Microcystis spp. (2.8x106 cells/l) and Oscillatoria spp. (2520 indiv/l) were found dominant in July. The relationship between physico-chemical and biological parameter; temperature and phytoplankton were observed. Some species of phytoplankton have positive relationship with low oxygen content as well as nitrogen and some phytoplanktons have negative relationship. Diversity index of phytoplankton was carried out and ranged in between 0.279 to 1.296 and evenness index ranged from 0.1 to 0.9. The results indicated that the water of the river Buriganga was highly polluted and plankton diversity index was moderately rich and evenly distributed.

Keywords: Buriganga River, Phytoplankton, Species diversity, Water quality parameters

Location: In the river Buriganga

Start Date: 00-01-2001

End Date: 00-12-2001

Program Area: Conservation and Biodiversity

Commodity: Plankton, Water quality

Objectives:

At present the aquatic environment of the river Buringanga has been disrupted totally and many report stated that as a result of deoxygenating and toxic gases, the mortality of aquatic organisms are common and it may longer not able to support life (Khan, 1998). The faunal survey of the plankton of a river is basic work for a developing country like Bangladesh.

Methodology:

The river Buriganga is surrounded by south-western periphery of the Dhaka city. It is considered as one of the most populated urban river in the country, Bangladesh. It lies between latitude 230 37′42″N and longitude 900 26′30″E. The three study areas were selected such Kamrangirchar (S1), Babubazar (S2) and Sadarghatat (S3) of the river and sampling time was 9am to 12pm from January 2001 to December 2001. The physico-chemical and biological parameter were recorded by HACH kit (model FF-2 cat, No. 2430-01) and electrical microscope {OLYMPUS (CH30) EA40 (0.65160/0.17)} respectively. Phytoplankton was analyzed qualitatively and quantitatively by using taxonomic keys (Wards and Whipple, 1959). A part of unfiltered sample water was used to determine the ionic concentration such as: pH, conductivity, phosphate, salinity, were measured by digital pH meter (HI98107), digital conductivity meter (HACH-CO 150), colorimeter (HACH Model FF-2), salinity meter (HACHcal150) respectively. Dissolved Oxygen (DO) measured by DO meter (Do-5509 AF.01214) and the rest of the chemical compound acidity, alkalinity, hardness, ammonia, nitrite etc. were measured by HACH kit. Phytoplankton samples were collected using plankton net (20 micron mesh size) and preserved in dark sterile plastic bottles with 5% formalin on site. Identification of the phytoplankton species was conducted in laboratory of Fisheries and Marine Science department under a phase contrast light microscope at 16x40 and 16x10 magnification (Model No: XSZ21-05DN, Made in China) with bright field and phase contrast illumination. Quantitative analysis of phytoplankton was done on Sedgewick-Rafter counting chamber (S-R cell). Analysis involved transfer of 1 ml sub-sample from each of the samples to the Sedgewick- Rafter counter and counting of cells within 10 squares of the cells, chosen randomly. The cell counts were used for computing the cell density using the formula:

N= (A×C×X) ÷ (L×Y) Here, N= Number of phytoplankton per liter of original water. A= Average number of phytoplankton observed in 10 sub cell of the S-R cell. C= Volume of the concentrated sample in ml. X= Number of the total cells in the S-R cell. L= Volume of the original water expressed in liter. Y= Number of counted cells of the S-R cell. The phytoplankton were then identified up to the genus level and enumerated by APHA, 1992 and Bellinger. The mean number of phytoplankton was recorded and expressed numerically per liter of water of the river.

Source of Information: International Journal of Fisheries and Aquatic Studies 2016; 4(6): 526-530

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The water of the river Buriganga is highly polluted and contain very low amount of dissolved oxygen (0.25mg/l), which is threatened for fish and other aquatic lives. From the present study it was revealed that the river was moderately rich in phytoplankton diversity which is low compared with the previous study. However, Cyanobacteria appeared high in number during the study period. The highly toxic Microsystems spp. was found very high (2.8x104 cell/l) in number and forms bloom during winter season. In this paper we showed that phytoplankton diversity has declined alarmingly. If this situation continued it would be Dead River in near future. So, immediate action should be taken by the government to recover this river which is the heart of Dhaka city.

Knowledge Management: Journal