| 引用本文: | 王东雨,滕佳,孙超凡,王小丹,郭建军,李嘉旭,王清.三种硅藻对微塑料沉降行为的影响研究[J].海洋科学,2025,49(8):53-62. |
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| 三种硅藻对微塑料沉降行为的影响研究 |
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王东雨1,2,3, 滕佳1,2,3, 孙超凡1,2,3, 王小丹1,2,3, 郭建军1,2,3, 李嘉旭4, 王清1,2,3
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1.中国科学院烟台海岸带研究所 海岸带生物资源高效利用研究与发展中心, 山东 烟台 264003;2.中国科学院烟台海岸带研究所 牟平海岸带环境综合研究站, 山东 烟台 264003;3.中国科学院大学, 北京 100049;4.中国科学院大学(青岛)附属学校, 山东 青岛 266109
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| 摘要: |
| 微塑料(MPs)在海洋环境中的垂直迁移受到各种生物因素的影响,然而有关浮游植物对微塑料沉降行为的影响机制尚未阐明。本论文采用室内模拟结合显微观察的方法,研究了浮游硅藻纤细角毛藻(Chaetoceros gracilis)和两种底栖硅藻菱形藻(Nitzschia sp.)、舟形藻(Navicula sp.)与漂浮型聚丙烯微塑料(PP-MPs)、聚乙烯微塑料(PE-MPs)和非浮力聚酰胺(PA-MPs)对聚集体形成和MPs沉降行为的影响。研究结果表明,PE-MPs和PP-MPs均被Nitzschia sp.和Navicula sp.及其分泌的胞外聚合物(EPS)包裹成致密结构,硅藻定殖显著提升PE-MPs密度,C.gracilis组PA-MPs沉降速率最高。MPs-生物污损模型的结果同样显示,生物膜密度会影响MPs的沉降行为。研究结果揭示了硅藻介导的生物聚集作用对MPs海洋沉降行为的调控机制,为阐明近海MPs的输移机制提供理论依据。 |
| 关键词: 硅藻 微塑料 沉降行为 胞外聚合物 生物膜 |
| DOI：10.11759/hykx20250319002 |
| 分类号:X171;X55 |
| 基金项目:国家自然科学基金(42176161) |
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| Impact of three diatom species on the settling behaviors of microplastics in the seas |
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WANG Dongyu1,2,3, TENG Jia1,2,3, SUN Chaofan1,2,3, WANG Xiaodan1,2,3, GUO Jianjun1,2,3, LI Jiaxu4, WANG Qing1,2,3
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1.Research and Development Center for Efficient Utilization of Coastal Bioresources, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;2.Muping Coastal Environment Research Station, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;3.University of Chinese Academy of Sciences, Beijing 100049, China;4.Affiliated School of University of Chinese Academy of Sciences, Qingdao 266109, China
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| Abstract: |
| The vertical transport of microplastics (MPs) in marine environments is influenced by various biological factors. However, the mechanisms underlying the phytoplankton-mediated settling behaviors of MPs remain poorly understood. This study combined microscopic observations with simulations to investigate the effects of the planktonic diatom Chaetoceros gracilis and the benthic diatoms, Nitzschia sp. and Navicula sp., on aggregate formation and settling behavior in MPs. These included buoyant polypropylene MPs (PP-MPs), polyethylene MPs (PE-MPs), and non-buoyant polyamide MPs (PA-MPs). Results demonstrated that both PE-MPs and PP-MPs were encapsulated within dense structures formed by the extracellular polymeric substances secreted by Nitzschia sp. and Navicula sp. Diatom colonization significantly increased the density of PE-MPs, while PA-MPs exhibited the maximal settling velocity with C. gracilis treatment. The MPs-biofouling model developed in this study revealed that biofilm density critically influences the settling patterns of MPs. These findings elucidate the regulatory mechanisms underlying the effects of diatom-mediated bio-aggregation on the sedimentation patterns of marine MPs, providing theoretical foundations for understanding the coastal transport dynamics of MPs. |
| Key words: diatoms microplastics settling behavior extracellular polymeric substances biofilm |
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