Limnology of one of the worst affected rivers in Bangladesh : Phytoplankton diversity,its Seasonality and Pollution status in one of the worst affected river in Bangladesh

ISBN-13: 9783846548462 / Angielski / Miękka / 2011 / 180 str.

Md. Shafiqul Islam; Khondker Moniruzzaman

Opis

Phytoplankton diversity, 13 limnological variables recorded from three points reveals heavy to moderate pollution along 17 km stretch of the river Buriganga adjacent to Dhaka Metropolis. 180 species of phytoplankton belonging to 7 algal classes identified. Class Chlorophyceae stands highest and Cryptophyceae represented lowest. Among them about 70 taxa will be new report for Bangladesh. Comparison with the past, shows a greater shift of phytoplankton community i.e., from desmid and diatom dominated community to euglenoid and chlorococcoid dominated one. Most of the pollution related physico-chemical parameters increased some extent. Heavy loading of organic pollutants actually occurs near two upper stream stations. Water quality deteriorated seriously after 1995 but there exists a trend of gradual recovery from upstream to downstream. With in a span of 12 years dissolve oxygen dropped 90%, and soluble reactive phosphorus increase by 68%. Excessive concentration of some nutrients and pollutant particles might be responsible for bringing damage and incomplete growth in some phytoplankton. All these parameters indicate an overall deterioration of water quality of the river Buriganga.

O autorze

Dr. Md. Shafiqul Islam has obtained his PhD in Limnology in 2008. He joined Bangladesh civil service in 1998. Since then he has worked in different civil service positions including Deputy Director, Training in Ansar-VDP Academy and actively involved in village based training. He is the author of several articles published in reputed journals.