Microplastics interfere with mixotrophic Ochromonas eliminating toxic Microcystis
Microplastics interfere with mixotrophic Ochromonas eliminating toxic Microcystis
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微塑料干扰混合营养型红单胞菌消除有毒微囊藻
DOI：
10.1016/j.chemosphere.2020.129030
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发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Yang Zhou
中科院分区：
文献类型：
--
作者：
Kong Qingdan;Li Yannan;Xu Xiaoqing;Cheng Jiahui;Sun Yunfei;Zhang Lu;Huang Yuan;Yang Zhou
不同尺寸的微塑料广泛存在于淡水中，这可能会影响捕食者和猎物之间的种间动态。鞭毛虫Ochromonasgloeopara可以有效消除铜绿微囊藻并降解微囊藻毒素，在控制有害微囊藻方面显示出巨大的潜力。为了评估微塑料对O的影响。 胶球副消除微囊藻，我们设计了O的实验。 gloeopara 以不同尺寸（0.07 和 3 μm）和浓度（0、0.4、0.8、1.6 和 2.0 mg L−1）的微塑料为食的微囊藻。结果表明，M.的丰度最大。 无论大小和浓度如何，铜绿假单胞菌随着微塑料的添加而显着减少。 gloeoparacan 摄入微塑料并遭受其不利影响。 O 的最大丰度。 在 O 过程中，随着 3 μm 微塑料浓度的增加，Gloeopara 减少。 球副消除M. 铜绿假单胞菌，而 0.07 μm 微塑料不影响 O 的生长。 显然，gloeopara。在微塑料暴露期间，清除率为O． 格洛奥帕隆M. 铜绿假单胞菌随着微塑料浓度的增加而减少。特别是，3μm的微塑料对O的清除率有更强的降低作用。 格洛奥帕拉。时间到M。 随着两种尺寸的微塑料浓度的增加，铜绿假单胞菌的灭绝时间延长。相对而言，3μm微塑料对微囊藻的去除有较强的延迟作用。这些发现表明，微塑料会干扰原生动物消除有毒的微囊藻，这可能会加剧其对水生生态系统的不利影响。
Microplastics with different sizes exist widely in fresh waters, which may affect the interspecific dynamics between predator and prey. The flagellateOchromonasgloeoparacan efficiently eliminateMicrocystisaeruginosaand degrade microcystins, which shows great potential for controlling harmfulMicrocystis. In order to evaluate the effects of microplastics onO. gloeoparaeliminatingMicrocystis, we designed an experiment ofO. gloeoparafeeding onMicrocystisunder different sizes (0.07 and 3 μm) and concentrations (0, 0.4, 0.8, 1.6, and 2.0 mg L−1) of microplastics. The results showed that maximum abundance ofM. aeruginosadecreased significantly with addition of microplastics, regardless of the size and concentration.O. gloeoparacan ingest the microplastics and suffer from their adverse effects. The maximum abundance ofO. gloeoparadecreased with enhancing concentrations of 3 μm microplastics during the process ofO. gloeoparaeliminatingM. aeruginosa, whereas 0.07 μm microplastics did not affect the growth ofO. gloeoparaobviously. During the period of exposure under microplastics, clearance rate ofO. gloeoparaonM. aeruginosadecreased with the increasing concentrations of microplastics. Specially, 3 μm microplastics had a stronger reduction on clearance rate ofO. gloeopara. The time toM. aeruginosaextinction was prolonged with the increasing concentrations of microplastics in both sizes. Comparatively speaking, 3 μm microplastics had a stronger delayed effect on the removal ofMicrocystis. These findings suggest that microplastics can interfere with protozoa eliminating toxicMicrocystis, which may aggravate their adverse impacts on aquatic ecosystem.