纤毛虫 Euplotes balteatus 对来自小亚历山大虫(鼎叶目)的麻痹性贝类毒素具有抗性

IF 7.2 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Jing Li , Jinrong Wang , Xiuping He , Haifeng Gu , Xin Xu , Chen Liang , Yongchao Wang , Xiao Xu , Linxuan Jia , Junhui Chen , Miaohua Jiang , Jianming Chen
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引用次数: 0

摘要

研究食草动物与致毒藻类之间的相互作用,对于了解水生生态系统中的毒素动态以及开发生物方法来缓解有害藻类大量繁殖至关重要。甲藻亚历山大藻(Alexandrium minutum)是一种著名的微藻,是全球许多沿海地区麻痹性贝类毒素(PSTs)污染的罪魁祸首。本研究调查了在受控条件下,纤毛虫Euplotes balteatus对模拟A. minutum水华中细胞密度和PSTs转移的影响。鲍氏栉水母表现出对藻华产生的 PSTs 的抗性,细胞密度高达 10,000 cells/mL,在维持生长和繁殖的同时,还能在几天内消灭藻细胞。A. minutum 的细胞 PSTs 含量随着 E. balteatus 的放牧压力而增加。不过,由于密度大幅降低,藻群的整体毒性也降至可忽略不计的水平。藻类细胞中含有的大部分 PSTs 在释放到水体中之前会暂时积聚在 E. balteatus 中,这表明单细胞食草动物排泄 PSTs 的机制尚不清楚。原则上,E. balteatus 对 A. minutum 的捕食可促进细胞内的大部分 PST 转移到细胞外部分,从而降低其通过海洋营养途径积累和污染的风险。不过,这一过程也在一定程度上增加了细胞外 PST 对环境造成的潜在危害。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The ciliate Euplotes balteatus is resistant to Paralytic Shellfish Toxins from Alexandrium minutum (Dinophyceae)

The ciliate Euplotes balteatus is resistant to Paralytic Shellfish Toxins from Alexandrium minutum (Dinophyceae)

Research on interactions between grazers and toxigenic algae is fundamental for understanding toxin dynamics within aquatic ecosystems and developing biotic approaches to mitigate harmful algal blooms. The dinoflagellate Alexandrium minutum is a well-known microalga responsible for paralytic shellfish toxins (PSTs) contamination in many coastal regions worldwide. This study investigated the impact of the ciliate Euplotes balteatus on cell density and PSTs transfer in simulated A. minutum blooms under controlled conditions. E. balteatus exhibited resistance to the PSTs produced by A. minutum with a density of up to 10,000 cells/mL, sustaining growth and reproduction while eliminating algal cells within a few days. The cellular PSTs content of A. minutum increased in response to the grazing pressure from E. balteatus. However, due to the substantial reduction in density, the overall toxicity of the algal population decreased to a negligible level. Most PSTs contained within algal cells were temporarily accumulated in E. balteatus before being released into the water column, suggesting unclear mechanisms for PSTs excretion in unicellular grazers. In principle, the grazing of E. balteatus on A. minutum promotes the transfer of the majority of intracellular PSTs into extracellular portions, thereby mitigating the risk of their accumulation and contamination through marine trophic pathways. However, this process also introduces an increase in the potential environmental hazards posed by extracellular PSTs to some extent.

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来源期刊
Water Research X
Water Research X Environmental Science-Water Science and Technology
CiteScore
12.30
自引率
1.30%
发文量
19
期刊介绍: Water Research X is a sister journal of Water Research, which follows a Gold Open Access model. It focuses on publishing concise, letter-style research papers, visionary perspectives and editorials, as well as mini-reviews on emerging topics. The Journal invites contributions from researchers worldwide on various aspects of the science and technology related to the human impact on the water cycle, water quality, and its global management.
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