The presence of microplastics in aquatic ecosystems is of increasing global concern. Nano-sized plastics, in particular, can penetrate the cell membrane and cause biological death. Our study evaluated the combined impacts of several polystyrene mi-crospheres' sizes and nominal concentrations on the overall performance changes of Brachionus plicatilis. Experimental animals were exposed to three microplastic sizes (0.08, 0.5 and 6 μm) and five nominal concentrations (0, 0.5, 2, 8, 32 μg mL?1) for 20 d. Our results showed that the toxicological effect of particle size on rotifers did not significantly depend on the nominal concentration. The interaction between the nominal concentration and size occurred only for body length and lorica width. Specifically, high nominal concentrations of microplastics that were close to nanometer size significantly impaired the overall vitality of rotifers, embodied in shortage of body type, delay in the arrival of maturity, reduction in the cumulative number of neonates, and the advance of the death process. In comparison, fair-sized size (0.5 and 6 μm) displayed non-significant damage except for individual groups. Most notably, the net reproductive yield was only a third of what it was in the original environment, implying that there was not much fertility left. Besides, with the development of rotifers, the adverse effects of polystyrene microsphere drive had become more and more serious.

SUI Yanming;WANG Senyang;MOHSEN Mohamed;ZHANG Longsheng;SHEN Mengyan;LIU Zhiquan;NGUYEN Haidang;ZHANG Shengmao;LI Kaixing;LV Linlan;DONG Xuexing

School of Marine and Biological Engineering,Yancheng Institute of Technology,Yancheng 224002,China;Department of Animal Production,Faculty of Agriculture,Al-Azhar University,Nasr City,Cairo 11884,Egypt;CAS Key Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;School of Life Sciences,East China Normal University,Shanghai 200241,China;Research Institute for Aquaculture No.1,Dinh Bang-Tu Son-Bac Ninh 16352,Vietnam;East China Sea Fishery Research Institute,Chinese Academy of Fishery Sciences,Shanghai 200090,China

中国海洋大学学报（自然科学英文版）

[1]SUI Yanming;WANG Senyang;MOHSEN Mohamed;ZHANG Longsheng;SHEN Mengyan;LIU Zhiquan;NGUYEN Haidang;ZHANG Shengmao;LI Kaixing;LV Linlan;DONG Xuexing-.The Combined Effect of Plastic Particles Size and Concentration on Rotifers' (Brachionus plicatilis) Performance)[J].中国海洋大学学报（自然科学英文版）,2022(02):509-519

Rotifers,crospheres,rotifers,lorica

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