Role of the Lethabo Weir in altering the phytoplankton community structure of the Vaal River, South Africa

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY
S. Janse van Vuuren, A. Swanepoel
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引用次数: 0

Abstract

During 2012, aerial photographs of the Vaal River, South Africa, showed differences in water colour on either side of the Lethabo Weir. Water upstream of the weir was muddy brown, while water downstream was olive-green. Physical and chemical analyses indicated water quality differences upstream and downstream from the weir; furthermore, microscopic examination of water samples revealed that the colour difference were the result of different types of phytoplankton blooms. The upstream section was dominated by cryptophytes and green algae, while the downstream section experienced a cyanobacterial bloom dominated by Microcystis aeruginosa. The same phenomenon was again observed regularly between 2012 and 2022, and routine monitoring of the phytoplankton assemblage likewise indicated differences in the phytoplankton community composition upstream and downstream of the weir. The upstream section was characterised by various eukaryotic algae; in contrast, frequent and intensive cyanobacteria blooms occurred in the downstream section. Multivariate analyses showed a correlation between the different phytoplankton assemblages and physico-chemical properties of the river water. Many freshwater cyanobacteria and algae taxa are problematic: Microcystis and Dolichospermum produce potent cyanotoxins; flagellated green algae, cryptomonads and dinoflagellates produce substances that cause bad tastes and odours, plus the cells can cause floc disruption during drinking water treatment processes; and certain filamentous green algae and diatoms are known for clogging filters.
Lethabo堰在改变瓦尔河浮游植物群落结构中的作用,南非
2012年,南非瓦尔河的航拍照片显示,莱塔博堰两侧的水颜色存在差异。堰上游的水是泥褐色的,而下游的水是橄榄绿色的。物理和化学分析表明,堰上游和下游的水质存在差异;此外,对水样的显微镜检查表明,这种颜色差异是不同类型浮游植物水华的结果。上游段以隐生植物和绿藻为主,而下游段则经历了以铜绿微囊藻为主的蓝藻水华。2012年至2022年间,再次定期观察到同样的现象,对浮游植物群落的常规监测同样表明,堰上游和下游的浮游植物群落组成存在差异。上游部分以各种真核藻类为特征;相比之下,下游河段蓝藻水华频繁而密集。多元分析表明,不同浮游植物组合与河水的物理化学性质之间存在相关性。许多淡水蓝藻和藻类类群都存在问题:微囊藻和无精子藻产生强大的蓝藻毒素;有鞭毛的绿藻、隐单藻和甲藻产生的物质会引起不好的味道和气味,而且这些细胞在饮用水处理过程中会引起絮凝物的破坏;并且已知某些丝状绿藻和硅藻会堵塞过滤器。
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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