College of Civil Engineering and Architecture, Anhui Polytechnic University, Wuhu 241000, China; Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Wuhu 241000, China.
College of Civil Engineering and Architecture, Anhui Polytechnic University, Wuhu 241000, China.
Ecotoxicol Environ Saf. 2021 Jan 15;208:111705. doi: 10.1016/j.ecoenv.2020.111705. Epub 2020 Dec 7.
The baking industries and disinfection of tap water released a considerable amount of bromate into surface water, which has been reported as a carcinogenic compound to mammals. Rotifers play an important role in freshwater ecosystems and are model organisms to assess environmental contamination. In the present study, the effects of different concentrations (0.001, 0.01, 0.1, 1, 10, 100 and 200 mg/L) of bromate on the life-table and population growth parameters were investigated in the rotifer Brachionus calyciflorus. The results showed that the 24-h LC of bromate to B. calyciflorus was 365.29 mg/L (95%Cl: 290.37-480.24). Treatments with 0.01, 10 and 200 mg/L bromate shorten the reproductive period. High levels of bromate (100 and 200 mg/L) significantly decreased net reproductive rate, intrinsic rate of population increase, life span, mictic rate of B. calyciflorus. To investigate the underlying mechanisms, swimming speed and antioxidative biomarkers were compared between bromate treatments and the control. The results showed that glutathione (GSH) and malondialdehyde (MDA) contents, total superoxide dismutase (T-SOD) and peroxidase (POD) activities decreased significantly in response to bromate exposure and the reasons required further investigation. Treatments with 0.001-200 mg/L bromate all significantly reduced swimming linear speed to rotifer larvae and treatments with 100-200 mg/L bromate significantly suppressed the swimming linear speed of adult rotifer. These changes would reduce filtration of algal food and could explain the decreased survival and reproduction. Overall, bromate may not show acute toxicity to rotifers, but still have potential adverse effects on rotifer behavior, which may then influence the community structure in aquatic ecosystems.
制烘焙食品业和自来水消毒将大量的溴酸盐释放到地表水中，而溴酸盐已被报道为一种对哺乳动物具有致癌性的化合物。轮虫在淡水生态系统中发挥着重要作用，并且是评估环境污染的模式生物。本研究调查了不同浓度（0.001、0.01、0.1、1、10、100 和 200 mg/L）的溴酸盐对萼花臂尾轮虫生活史和种群增长参数的影响。结果表明，溴酸盐对萼花臂尾轮虫的 24-h LC50 为 365.29 mg/L（95%Cl：290.37-480.24）。0.01、10 和 200 mg/L 溴酸盐处理缩短了生殖期。高浓度（100 和 200 mg/L）溴酸盐显著降低了净生殖率、种群内禀增长率、寿命、轮虫的孤雌生殖率。为了研究潜在机制，比较了溴酸盐处理组和对照组轮虫的游泳速度和抗氧化生物标志物。结果表明，谷胱甘肽（GSH）和丙二醛（MDA）含量、总超氧化物歧化酶（T-SOD）和过氧化物酶（POD）活性在暴露于溴酸盐后显著降低，其原因需要进一步研究。0.001-200 mg/L 溴酸盐处理均显著降低了轮虫幼虫的游泳直线速度，而 100-200 mg/L 溴酸盐处理显著抑制了成体轮虫的游泳直线速度。这些变化会减少对藻类食物的过滤，从而解释了存活率和繁殖率的降低。总的来说，溴酸盐对轮虫可能没有表现出急性毒性，但仍可能对轮虫行为产生潜在的不良影响，进而影响水生生态系统中的群落结构。
Zotero 插件