Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China.
Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China.
Environ Pollut. 2024 Mar 1;344:123308. doi: 10.1016/j.envpol.2024.123308. Epub 2024 Jan 5.
Microplastics (MPs) and nanoplastics (NPs) have gained global concern due to their detrimental effects on marine organisms. We investigated the effects of 80 nm polystyrene (PS) NPs on life history traits, ingestion, and dimethyl sulfide (DMS) and dimethylsulfoniopropionate (DMSP) production in the rotifer Brachionus plicatilis. Fluorescently labeled 80 nm PS NPs were ingested by the rotifer B. plicatilis and accumulated in the digestive tract. The lethal rates of B. plicatilis exposed to NPs were dose-dependent. High concentrations of PS NPs exposure had negative effects on developmental duration, leading to prolonged embryonic development and pre-reproductive periods, shortened reproductive period, post-reproductive period, and lifespan in B. plicatilis. High concentrations of PS NPs exposure inhibited life table demographic parameters such as age-specific survivorship and fecundity, generation time, net reproductive rate, and life expectancy. Consequently, the population of B. plicatilis was adversely impacted. Furthermore, exposure to PS NPs resulted in a reduced ingestion rate in B. plicatilis, as well as a decreased in DMS, particulate DMSP (DMSP) concentration, and DMSP lyase activity (DLA), which exhibited a dose-response relationship. B. plicatilis grazing promoted DLA and therefore increased DMS production. PS NPs exposure caused a decline in the increased DMS induced by rotifer grazing. Our results help to understand the ecotoxicity of NPs on rotifer and their impact on the biogeochemical cycle of dimethylated sulfur compounds.
微塑料（MPs）和纳米塑料（NPs）因其对海洋生物的有害影响而受到全球关注。我们研究了 80nm 聚苯乙烯（PS）NPs 对褶皱臂尾轮虫生活史特征、摄食以及二甲基硫（DMS）和二甲基巯基丙酸（DMSP）产生的影响。荧光标记的 80nm PS NPs 被褶皱臂尾轮虫 B. plicatilis 摄食，并积累在消化道中。轮虫 B. plicatilis 暴露于 NPs 的致死率呈剂量依赖性。高浓度 PS NPs 暴露对发育持续时间有负面影响，导致胚胎发育和生殖前期延长，生殖期、生殖后期和寿命缩短。高浓度 PS NPs 暴露抑制了生命表人口统计学参数，如特定年龄的存活率和繁殖力、世代时间、净生殖率和预期寿命。因此，轮虫 B. plicatilis 的种群受到不利影响。此外，PS NPs 暴露导致轮虫的摄食率降低，DMS、颗粒状 DMSP（DMSP）浓度和 DMSP 裂解酶活性（DLA）降低，呈剂量反应关系。轮虫摄食促进了 DLA，从而增加了 DMS 的产生。PS NPs 暴露导致轮虫摄食引起的 DMS 增加减少。我们的研究结果有助于了解 NPs 对轮虫的生态毒性及其对二甲基化硫化合物生物地球化学循环的影响。
