聚苯乙烯纳米塑料和溴酸盐对萼花臂尾轮虫的联合毒性作用
Combined Toxicity of Polystyrene Nanoplastics and Bromate to Rotifer Brachionus calyciflorus
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摘要: 聚苯乙烯纳米塑料(polystyrene nanoplastics, PSNPs)和溴酸盐(BrO-3)广泛存在于水环境中,会对水生生物产生不利影响。为了探究PSNPs和溴酸钠(NaBrO3)共存条件下对轮虫的联合毒性效应,以萼花臂尾轮虫(Brachionus calyciflorus)为受试生物,探究了PSNPs (0.001、0.1 mg·L-1)、NaBrO3 (0.001、0.1 mg·L-1)以及它们的联合作用对轮虫生命表参数、种群增长、个体及卵大小的影响。PSNPs和NaBrO3单一及联合暴露显著影响萼花臂尾轮虫的生命表参数,其中,内禀增长率是最为灵敏的参数。0.1 mg·L-1 PSNPs和0.001、0.1 mg·L-1 NaBrO3联合暴露使轮虫个体显著减小,0.001 mg·L-1 PSNPs和0.001、0.1 mg·L-1 NaBrO3联合暴露使轮虫的卵体积显著增大。PSNPs和NaBrO3联合作用对轮虫种群增长的抑制产生协同效应,0.001、0.1 mg·L-1 PSNPs与0.001 mg·L-1 NaBrO3联合作用对轮虫个体的抑制表现出拮抗作用,0.001、0.1 mg·L-1 NaBrO3能够降低0.1 mg·L-1 PSNPs对轮虫净生殖率的抑制作用。结果表明,PSNPs和NaBrO3联合作用对轮虫产生了复杂的毒性效应,且联合毒性效应与PSNPs、NaBrO3的浓度配比有关。Abstract: Polystyrene nanoplastics (PSNPs) and bromate (BrO-3) exist widely in aquatic environment, which can adversely affect aquatic organisms. In order to explore the combined toxic effects of PSNPs and sodium bromate (NaBrO3) on rotifers, the effects of PSNPs (0.001, 0.1 mg·L-1), NaBrO3 (0.001, 0.1 mg·L-1) and their combined actions on life-table parameters, population growth, body and egg size of rotifers Brachionus calyciflorus were investigated in this study. The results showed that the single and combined exposure of PSNPs and NaBrO3 significantly affected the life-table parameters of Brachionus calyciflorus, in which intrinsic rate of population increase was the most sensitive parameter. The combined exposure of 0.1 mg·L-1 PSNPs and 0.001, 0.1 mg·L-1 NaBrO3 significantly reduced the size of the rotifer body, and the combined exposure of 0.001 mg·L-1 PSNPs and 0.001, 0.1 mg·L-1 NaBrO3 significantly increased the egg size of the rotifers. PSNPs and NaBrO3 had a synergistic effect on the inhibition of the population growth of rotifers. 0.001, 0.1 mg·L-1 PSNPs and 0.001 mg·L-1 NaBrO3 showed an antagonistic effect on the inhibition of the body size of rotifers. 0.001, 0.1 mg·L-1 NaBrO3 could reduce the inhibitory effect of 0.1 mg·L-1 PSNPs on the net reproductive rate of rotifers. The results showed that the combination of PSNPs and NaBrO3 produced complex toxic effects on rotifers, and the combined toxic effects depend on the concentration ratio of PSNPs and NaBrO3.
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