产生毒素的Synechococcus在热带地区的当前和未来潜在作用
Zhi Yang Sim1, Kwan Chien Goh1, Yiliang He2
1National University of Singapore Environmental Research Institute, National University of Singapore, 1 Create Way, #15-02, Singapore 138602, Singapore.
The Science of the total environment
|July 3, 2023
概括
气温上升和营养污染有利于像Synechococcus这样的picocyanobacteria. 这项研究表明,气候变化增加了它们的毒性,影响了水生生态系统和有害的藻类繁殖.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 生态生态学 生态生态学
背景情况:
- 人为气候变化正在增加全球气温和水生生态系统中的营养物质负载.
- 预计Picocyanobacteria,特别是Synechococcus,在这些不断变化的条件下会壮成长.
- 生产毒素的Synechococcus物种广泛存在,但在许多淡水环境中仍未得到充分研究.
研究的目的:
- 研究新型产生毒素的Synechococcus菌株 (淡水和水) 对模拟气候变化条件的生态反应.
- 为了确定温度升高和营养素 (和) 可用性对Synechococcus生长,细胞丰度和毒素产生的影响.
- 评估这些环境因素对Synechococcus毒性和随后动物浮游生物放牧的影响.
主要方法:
- 控制的实验室实验使用淡水和水的Synechococcus菌株进行.
- 培养物暴露在各种温度 (25°C至34°C) 和不同 (N) 和 (P) 营养度的范围内.
- 测量包括细胞丰度,生长率,死亡率,细胞固体测量,毒素生产 (Anatoxin-a和Cylindrospermopsin) 以及动物浮游生物放牧的预测模型.
主要成果:
- 在28°C时,Synechococcus表现出最佳的生长,而更高的温度降低了两种类型的生长率.
- 升高的温度和营养丰富显著改变了细胞固态度,观察到需求增加.
- 毒素的产量有所不同:在丰富下,阿纳托克辛-a (ATX) 的产量在34°C达到峰值,而在限制下,在25°C时,西林多素 (CYN) 获得了优势.
- 在营养限制下,动物浮游生物的牧场减少了两倍,温度的影响最小.
结论:
- 温度和营养物质的可用性都是Synechococcus生长的关键驱动因素,固体测量和毒素生产.
- 气候变化场景,以变暖和营养制度的改变为特征,可能会增加Synechococcus种群的毒性.
- 这些发现强调了淡水和水环境中有害藻类繁殖增加的可能性以及相关的生态风险.
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