Effects of the Floc & Sink technique on the biomass and composition of phytoplankton morpho-functional groups using natural ballasts

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Fernanda Monicelli, Fabiana Araújo, Karina Patrícia Vieira da Cunha, Juliana Deo Dias, Vanessa Becker
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Abstract

The different characteristics of phytoplankton species, such as morphology and the mechanism of resistance to sedimentation, can impact the effectiveness of the Floc & Sink (F&S) technique. In this study, we aimed to analyze the effects of the F&S on biomass and phytoplankton composition, in eutrophic waters from Brazilian semiarid. We applied a chemical coagulant (polyaluminum chloride—PAC), isolated and in combination with natural ballasts (planosol, beige lime and white lime). To assess adaptive strategies, such as positive buoyancy, we applied the morphology-based functional groups (MBFG) approach. The technique effects on the phytoplankton biomass and composition varied according to the sedimentation resistance mechanism. Group IV, lacking specialized characteristics, sedimented in all treatments. The presence of a mucilage sheath and aerotopes prevented its sedimentation in all treatments, and when Microcystis aeruginosa was not present, Group VII sedimented after all treatments. Neither Group V (flagellates) and VI (small diatoms) exhibited sedimentation. Also, filamentous cyanobacteria (Group VIII) demonstrated enhanced resistance to sedimentation and only sedimented when there was a combination of PAC + natural ballasts. Furthermore, employing natural ballast materials provides a cost-effective alternative for removing algal biomass, being observed a drop of 70–80%. Thus, the combination of PAC + natural ballasts was more suitable to remove biomass than PAC alone.

Abstract Image

絮凝沉降技术对使用天然压舱物的浮游植物形态功能群生物量和组成的影响
浮游植物物种的不同特征(如形态和抗沉积机制)会影响絮凝沉降(F&S)技术的效果。本研究旨在分析絮凝沉降技术对巴西半干旱富营养化水域生物量和浮游植物组成的影响。我们单独使用了一种化学混凝剂(聚合氯化铝-PAC),并将其与天然镇流器(planosol、米色石灰和白色石灰)结合使用。为了评估正浮力等适应策略,我们采用了基于形态的功能组(MBFG)方法。根据沉积阻力机制的不同,技术对浮游植物生物量和组成的影响也不同。第 IV 组缺乏专门特征,在所有处理中都会沉积。当铜绿微囊藻不存在时,第七组在所有处理后都会沉积。第五组(鞭毛藻)和第六组(小型硅藻)均未出现沉淀现象。此外,丝状蓝藻(第 VIII 组)表现出更强的抗沉积能力,只有在使用 PAC 和天然压舱物时才会沉积。此外,使用天然镇流器材料是去除藻类生物量的一种具有成本效益的替代方法,据观察,藻类生物量下降了 70-80%。因此,PAC 和天然镇流器的组合比单独使用 PAC 更适合去除生物量。
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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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