微塑料
蛋白核小球藻
藻类
浮游植物
光合作用
小球藻
环境化学
生物
水华
化学
植物
生态学
营养物
作者
Yufeng Mao,Hainan Ai,Yi Chen,Zhenyu Zhang,Peng Zeng,Li Kang,Wei Li,Weikang Gu,Qiang He,Hong Li
出处
期刊:Chemosphere
[Elsevier]
日期:2018-10-01
卷期号:208: 59-68
被引量:464
标识
DOI:10.1016/j.chemosphere.2018.05.170
摘要
Microplastics are widely identified in aquatic environments, but their impacts on phytoplankton have not been extensively studied. Here, the responses of Chlorella pyrenoidosa under polystyrene (PS) microplastics exposure were studied across its whole growth period, with microplastic sizes of 0.1 and 1.0 μm and 3 concentration gradients each, which covered (10 and 50 mg/L) and exceeded (100 mg/L) its environmental concentrations, respectively. PS microplastics caused dose-dependent adverse effects on Chlorella pyrenoidosa growth from the lag to the earlier logarithmic phases, but exhibited slight difference in the maximal inhibition ratio (approximately 38%) with respect to the two microplastic sizes. In addition to the reduced photosynthetic activity of Chlorella pyrenoidosa, unclear pyrenoids, distorted thylakoids and damaged cell membrane were observed, attributing to the physical damage and oxidative stress caused by microplastics. However, from the end of the logarithmic to the stationary phase, Chlorella pyrenoidosa could reduce the adverse effects of microplastics jointly through cell wall thickening, algae homo-aggregation and algae-microplastics hetero-aggregation, hence triggering an increase of algal photosynthetic activity and its growth, and cell structures turned to normal. Our study confirmed that PS microplastics can impair but then enhance algae growth, which will be helpful in understanding the ecological risks of microplastics.
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