
	Pakistan Journal of Biological Sciences
	Year: 2015 \| Volume: 18 \| Issue: 2 \| Page No.: 50-58 DOI: 10.3923/pjbs.2015.50.58

Effect of Environmental Factors on Cyanobacterial Abundance and Cyanotoxins Production in Natural and Drinking Water, Bangladesh

Abu Affan, Hisham S. Khomayis, Salim Marzoog Al- Harbi, Mahfuzul Haque and Saleha Khan

Abstract: Cyanobacterial blooms commonly appear during the summer months in ponds, lakes and reservoirs in Bangladesh. In these areas, fish mortality, odorous water and fish and human skin irritation and eye inflammation have been reported. The influence of physicochemical factors on the occurrence of cyanobacteria and its toxin levels were evaluated in natural and drinking water in Bangladesh. A highly sensitive immunosorbent assay was used to detect microcystins (MCs). Cyanobacteria were found in 22 of 23 samples and the dominant species were Microcystis aeruginosa, followed by Microcystis flosaquae, Anabeana crassa and Aphanizomenon flosaquae. Cyanobacterial abundance varied from 39 to 1315×10³ cells mL^-1 in natural water and 31 to 49×10³ cells mL^-1 in tap water. MC concentrations were 25-82300 pg mL^-1 with the highest value measured in the fish research pond, followed by Ishakha Lake. In tap water, MC concentrations ranged from 30-32 pg mL^-1. The correlation between nitrate-nitrogen (NO₃-N) concentration and cyanobacterial cell abundance was R² = 0.62 while that between cyanobacterial abundance and MC concentration was R² = 0.98. The increased NO₃-N from fish feed, organic manure, poultry and dairy farm waste and fertilizer from agricultural land eutrophicated the water bodies and triggered cyanobacterial bloom formation. The increased amount of cyanobacteria produced MCs, subsequently reducing the water quality.

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How to cite this article:

Abu Affan, Hisham S. Khomayis, Salim Marzoog Al- Harbi, Mahfuzul Haque and Saleha Khan, 2015. Effect of Environmental Factors on Cyanobacterial Abundance and Cyanotoxins Production in Natural and Drinking Water, Bangladesh. Pakistan Journal of Biological Sciences, 18: 50-58.

DOI: 10.3923/pjbs.2015.50.58

URL: https://scialert.net/abstract/?doi=pjbs.2015.50.58

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