College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China.
Shandong Key Laboratory of Marine Ecological Restoration, Shandong Marine Resources and Environment Research Institute, Yantai, 264006, China.
Mar Environ Res. 2024 Jan;193:106259. doi: 10.1016/j.marenvres.2023.106259. Epub 2023 Nov 11.
Nanoplastics and heavy metals are common pollutants in coastal environments with high concerns, but their joint ecological risk to marine primary productivity remains unclear. In this study, the effects of 7, 70, 700 μg/L lead (Pb) single exposure and in combination with 200 μg/L polystyrene nanoplastics (NPs, 70 nm) on marine microalga Platymonas helgolandica were investigated. Pb single exposure induced a dose-dependent inhibition on the growth of P. helgolandica, which was associated with the reduced photosynthetic efficiency and nutrient accumulation. Compared to Pb single exposure, the addition of NPs significantly reduced the photosynthetic efficiency and aggravated the damage to cell structure. Reduced esterase activity and increased membrane permeability also indicated that NPs exacerbated the adverse effects of Pb on P. helgolandica. Thus, co-exposure to NPs and Pb induced more severe impacts on marine microalgae, suggesting that the joint ecological risk of NPs and heavy metals to marine primary productivity merits more attention.
纳米塑料和重金属是沿海环境中常见的污染物，引起了高度关注，但它们对海洋初级生产力的联合生态风险仍不清楚。在这项研究中，研究了 7、70、700μg/L 铅（Pb）单一暴露以及与 200μg/L 聚苯乙烯纳米塑料（NPs，70nm）联合暴露对海洋微藻旋链毛藻（Platymonas helgolandica）的影响。Pb 单一暴露对 P.helgolandica 的生长表现出剂量依赖性抑制作用，这与光合作用效率的降低和营养物质积累减少有关。与 Pb 单一暴露相比，添加 NPs 显著降低了光合作用效率，并加重了细胞结构的损伤。酯酶活性降低和膜通透性增加也表明 NPs 加剧了 Pb 对 P.helgolandica 的不利影响。因此，NPs 和 Pb 的共暴露对海洋微藻产生了更严重的影响，这表明 NPs 和重金属对海洋初级生产力的联合生态风险值得更多关注。
