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ARPN Journal of Science and Technology >> Volume 7, Issue 2, November 2017

ARPN Journal of Science and Technology

Physico-Chemical Characteristics and Phytoplankton Diversity of Marjad Baor of Kaliganj Upazilla, Jhenaidah, Bangladesh

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Author Md. Ferdous Alam, Nusrat Jahan
ISSN 2225-7217
On Pages 91-98
Volume No. 4
Issue No. 2
Issue Date March 01, 2014
Publishing Date March 01, 2014
Keywords Marjad Baor, ecological critical area, physico-chemical characteristics, phytoplankton, eutrophication


“Marjad Baor” is the largest baor (oxbow lake) of Bangladesh with a total area of 253 hectares which is located 25 km apart from the Kaliganj Upazilla. Physico-chemical characteristics and phytoplankton diversity of Marjad Baor were studied from January, 2010 to March, 2010 at four different spots to determine the water quality of the “Marjad Baor” including its physico-chemical conditions, phytoplankton diversity and their interrelationships. Its biological significance made it one of the major Ecological Critical Areas (ECAs) which was declared by Department of Environment (DoE) in 1995. Marjad Baor provides diverse types of services such as irrigation, transportation, economic welfare of the adjacent human community and most significantly diversified biological diversity of various indigenous species. Water and phytoplankton samples were collected three times from each spot. Important physical and chemical parameters prevailing in the study area such air temperature, water temperature, transparency, Electrical Conductivity (EC), Total Dissolved Solids (TDS), Hydrogen Ion Concentration (pH), Dissolved Oxygen (DO), Biological Oxygen Demand (BOD5), free CO2, carbonate (CO3-) and bicarbonate (HCO3-) alkalinity, calcium (Ca2+) and magnesium (Mg2+) hardness, total hardness, chloride (Cl-) content, nitrate (NO3-) and phosphate (PO43-) were analyzed. Water temperature was always less than the surrounding air temperature and varied within 3 to 5 °C. Seasonal variations of transparency was significant and varied within 54 cm to 69 cm. Mean EC value was 230 µs/cm. Mean TDS value was around 215 mg/l. The concentration of DO was within the limit of standard for fish cultivation and mean was 8.0 mg/l. Mean value of BOD5 was 1.56 mg/l. Mean values of free CO2, HCO3- alkalinity were respectively 0.05 mg/l and 6.15mg/l. The nature of water is slightly alkaline having a mean value 7.3. Mean values of calcium hardness, magnesium hardness and total hardness were respectively 4.0 mg/l, 3.50 mg/l and 93 mg/l which indicate that the water is moderately hard. Mean values of chloride and phosphate were likewise 0.82 ppm and 0.002 ppm but the concentration of nitrate was relatively high which shows the way to algal bloom. Total phytoplankton abundance was 1,09,900 in January, 2010 and 1,70,700 in March, 2010 that showing the trend of frequent phytoplankton growth. Oscillatoria sp. was the dominant phytoplankton species in the baor water which is known as the main contributor to eutrophication.

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