受到有害藻类Chattonella marina调节的微塑料聚合和沉没:对垂直运输和再悬浮的影响
Kavindu Dhananjaya Sudusinghe1, Young Kyun Lim2, Chung Hyeon Lee3
1Ecological Risk Research Department, Korea Institute of Ocean Science and Technology (KIOST), Geoje, 53201, Republic of Korea; Department of Ocean Science, KIOST School, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea.
Environmental pollution (Barking, Essex : 1987)
|August 15, 2025
概括
有害的藻类繁殖,如Chattonella marina,促进微塑料 (MP) 在海洋环境中聚合和沉没. 这些MP聚合物保持稳定,影响其垂直分布和命运.
科学领域:
- 海洋生物学 海洋生物学
- 环境科学 环境科学
- 海洋学 海洋学 海洋学
背景情况:
- 微塑料 (MP) 是普遍存在的海洋污染物.
- 它们的垂直分布受到生物相互作用的影响,包括与植物浮游生物的聚合.
- 有害藻类繁殖 (HABs) 是海洋生态系统的一个重要生物因素.
研究的目的:
- 调查HAB物种Chattonella marina对聚乙烯 (PE) 和聚烯 (PP) 微塑料聚合和沉没的影响.
- 在低温条件下评估MP聚合物的再悬浮潜力.
- 为了确定在HAB事件中形成的MP聚合物的稳定性和微生物耐药性.
主要方法:
- 在92天内对MP与C. marina的聚合进行实验性评估.
- 测量MP沉降速度和沉降比率.
- 在低温 (12°C) 条件下对聚合物再悬浮的检查.
- 分析了C. marina叶绿素度和MP沉没之间的相关性.
主要成果:
- 聚合是由C. marina细胞溶解的细胞内物质驱动的,形成大型MP聚合物.
- 低密度PE颗粒显示出物流沉没模式 (最大9%的沉没比率),而PP碎片的沉积量可以忽略不计 (<1%).
- 较大的聚合物呈现出更快的沉降速度 (高达76.9 m·day-1).
- C. marina 叶绿素的度与PE沉没率 (R2=0.92) 有正相关.
- 在三个月的时间里,MP聚合物在结构上保持稳定,并且能够抵抗再悬浮和微生物降解.
结论:
- 沙顿氏菌海洋大大提高了海洋环境中的微塑料聚合和沉积.
- 叶绿素a可以作为一个代理聚合诱导物质在藻类开花衰老过程中.
- 在HAB中形成的微塑料聚合物表现出长期稳定性,影响它们在海洋中的垂直流和命运.
- 这些发现为改进微塑料运输和分布模型提供了经验数据.
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