Natural water brownification as a shift in the phytoplankton community in a deep hard water lake

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• 作者：Tomasz Lenard ; Wojciech Ejankowski
• 关键词：Water colour ; Nutrients concentration ; Total precipitation ; Dry and wet periods ; Phytoplankton biomass ; Hard water lake
• 刊名：Hydrobiologia
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：787
• 期：1
• 页码：153-166
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Freshwater & Marine Ecology; Ecology; Zoology;
• 出版者：Springer International Publishing
• ISSN：1573-5117
• 卷排序：787

文摘

The effect of long-term changes in total precipitation on physical and chemical parameters of the water and the structure of phytoplankton community during a year were studied in a deep hard water lake. With respect to total precipitation, two different periods were distinguished: dry and wet. In the wet period, the water level rose and caused an increase in the water colour and a decrease in the electrolytic conductivity and concentration of nutrients. These changes were reflected in the composition and amount of phytoplankton. Certain phytoplankton groups, e.g. Cryptophyceae, Dinophyceae, Chrysophyceae, Bacillariophyceae and Chlorophyta/Charophyta, were positively affected by the environmental changes; instead, these effects were not observed in Cyanobacteria and Euglenophyta. The development of flagellates, such as Cryptomonas curvata, Plagioselmis nannoplanctica and Ceratium hirundinella, was enhanced during the wet period, whereas the dry period favoured non-flagellates, such as Planktothrix agardhii, Planktothrix rubescens and Limnothrix planctonica. Hence, the long-term variability in total precipitation can be a switch from non-flagellate- to flagellate-dominated phytoplankton in lakes. Moreover, a short time of ice cover duration in winter linked with the wet period promoted phytoplankton groups typical for spring and autumn, e.g. Cryptophyceae and Bacillariophyceae.