摘要
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 × 103 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.
摘要译文
这项研究的目的是分析在浅水富营养化池塘相关的有害藻华的季节动态的基本机制和影响因素，高浓度的磷，磷（孟加拉国2005年9月，日在2006年的两个突出的事件是在整个研究期间同时注意蓝藻水华的特点是3丰度相，其中每一个具有不同的生态过程中相关联。高硝酸盐氮（1 / SUP），例如，用高蓝藻丰度相关联，而低硝酸盐氮（0.36; SD 0.2毫克升极低的NO3 - N / PO4 -P比（蓝藻水华均与温度相关（r在共显性表现出微囊随温度的负相关（r这是由于鱼腥过度生长是抑制微囊的增长。 Planktothrix是第三个最优势类群，而眼虫被视为投机。
Roksana Jahan [1] [2] Saleha Khan [1] Md. Mahfuzul Haque [1] Joong Ki Choi [2]. Study of harmful algal blooms in a eutrophic pond, Bangladesh[J]. Environmental Monitoring and Assessment, 2010,170(1-4): 7-21