Research and Development Center for Efficient Utilization of Coastal Bioresources, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China; Muping Coastal Environment Research Station, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
Research and Development Center for Efficient Utilization of Coastal Bioresources, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China; Muping Coastal Environment Research Station, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China.
Mar Pollut Bull. 2023 Aug;193:115153. doi: 10.1016/j.marpolbul.2023.115153. Epub 2023 Jun 14.
Microplastics (MPs) pollution and salinity variation are two environmental stressors, but their combined effects on marine mollusks are rarely known. Oysters (Crassostrea gigas) were exposed to 1 × 10 particles L spherical polystyrene MPs (PS-MPs) of different sizes (small polystyrene MPs (SPS-MPs): 6 μm, large polystyrene MPs (LPS-MPs): 50-60 μm) under three salinity levels (21, 26, and 31 psu) for 14 days. Results demonstrated that low salinity reduced PS-MPs uptake in oysters. Antagonistic interactions between PS-MPs and low salinity mainly occurred, and partial synergistic effects were mainly induced by SPS-MPs. SPS-MPs induced higher lipid peroxidation (LPO) levels than LPS-MPs. In digestive glands, low salinity decreased LPO levels and glycometabolism-related gene expression, which was related to salinity levels. Low salinity instead of MPs mainly affected metabolomics profiles of gills through energy metabolism and osmotic adjustment pathway. In conclusion, oysters can adapt to combined stressors through energy and antioxidative regulation.
微塑料 (MPs) 污染和盐度变化是两种环境胁迫因素，但它们对海洋贝类的综合影响知之甚少。研究人员将牡蛎 (Crassostrea gigas) 暴露于三种盐度水平 (21、26 和 31 psu) 下的不同大小的 1×10 个粒子 L 球形聚苯乙烯 MPs (PS-MPs) (小聚苯乙烯 MPs (SPS-MPs)：6 μm，大聚苯乙烯 MPs (LPS-MPs)：50-60 μm) 中 14 天。结果表明，低盐度降低了牡蛎对 PS-MPs 的吸收。PS-MPs 和低盐度之间主要发生拮抗相互作用，部分协同作用主要由 SPS-MPs 诱导。SPS-MPs 诱导的脂质过氧化 (LPO) 水平高于 LPS-MPs。在消化腺中，低盐度降低了 LPO 水平和糖代谢相关基因的表达，这与盐度水平有关。相反，低盐度而不是 MPs 主要通过能量代谢和渗透调节途径影响鳃的代谢组学图谱。总之，牡蛎可以通过能量和抗氧化调节来适应复合胁迫。
