Jahan R, Khan S, Haque MM, Choi JK. Study of harmful algal blooms in a eutrophic pond, Bangladesh.
ENVIRONMENTAL MONITORING AND ASSESSMENT 2010;
170:7-21. [PMID:
19856121 DOI:
10.1007/s10661-009-1210-4]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2008] [Accepted: 10/09/2009] [Indexed: 05/28/2023]
Abstract
The purpose of this research was to analyze the underlying mechanisms and contributing factors related to the seasonal dynamic of harmful algal blooms in a shallow eutrophic pond, Bangladesh during September 2005-July 2006. Two conspicuous events were noted simultaneously throughout the study period: high concentration of phosphate-phosphorus (>3.03; SD 1.29 mg l(-1)) and permanent cyanobacterial blooms {>3,981.88×10(3) cells l(-1) (SD 508.73)}. Cyanobacterial blooms were characterized by three abundance phases, each of which was associated with different ecological processes. High nitrate-nitrogen (>2.35; SD 0.83 mg l(-1)), for example, was associated with high cyanobacterial abundance, while low nitrate-nitrogen (0.36; SD 0.2 mg l(-1)) was recorded during moderate abundance phase. Extremely low NO3-N/PO4-P ratio (>3.55, SD 2.31) was recorded, and all blooming taxa were negatively correlated with this ratio. Cyanobacterial blooms were positively correlated with temperature (r=0.345) and pH (0.833; p=0.05) and negatively correlated with transparency (r=-0.956; p=0.01). Although Anabaena showed similar relationship with water quality parameters as cyanobacteria, the co-dominant Microcystis exhibited negative relationship with temperature (r=-0.386) and nitrate-nitrogen (r=-0.172). This was attributed to excessive growth of Anabaena that suppressed Microcystis's growth. Planktothrix was the third most dominant taxa, while Euglena was regarded as opportunistic.
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