标题: Understanding the toxicity risk of antibiotic emissions of aquaculture from the perspective of fluctuations concentration

作者: Li, HX (Li, Huixiang); Zhang, WH (Zhang, Weihao); Yan, HM (Yan, Huimin); Gao, P (Gao, Pan)

来源出版物: ENVIRONMENTAL POLLUTION  卷: 351  文献号: 124024  DOI: 10.1016/j.envpol.2024.124024  Published Date: 2024 JUN 15  

摘要: Organisms are generally exposed to target contaminant with stable concentrations in traditional ecotoxicological studies. However, it is difficult to truly represent the dynamics and complexity of actual aquatic pollution for risk management. Contaminants may enter nearby aquatic systems in pulsed exposure, thus resulting in that aquatic organisms will be exposed to contaminants at fluctuating concentrations. Especially during the season of summer, due to the changes in displacement or periodic emissions of veterinary antibiotics in aquaculture, algal blooms occur frequently in surrounding waters, thus leading to eutrophication of the water. Florfenicol (FFC) is currently widely used as a veterinary antibiotic, but the aquatic ecological risks of FFC under concentration fluctuations are still unknown. Therefore, the acute exposure, chronic exposure and pulsed exposure effects of FFC on Microcystis aeruginosa were investigated to comprehensively evaluate the ecological risk of FFC and raise awareness of the pulsed exposure mode. Results indicated that the toxic effects of FFC on M . aeruginosa were dominated by exposure mode, exposure duration, exposure frequency, and exposure concentration. The maximum growth inhibition rate of the 10 mu g/L FFC treatment amounted to 4.07% during chronic exposure of 18 days. However, the growth inhibition rate decreased from 55.1% to 19.31% when algae was exposure to 10 mu g/L FFC during the first pulsed exposure (8 h). Therefore, when the concentration of FFC was equal under chronic and pulsed exposure, FFC exhibited greater toxicity on M. aeruginosa in short pulsed exposure than in continuous exposure. In addition, repetitive pulsed exposure strengthened the resistance of M. aeruginosa on FFC. The adaptive regulation of algae was related to the duration and frequency of exposure. Above results suggested that traditional toxicity assessments lacked consideration for fluctuating concentrations during pollutant emissions, thus underestimating the environmental risk of contaminant. This investigation aims to facilitate the standardization of pulsed exposure.

作者关键词: Acute exposure; Chronic exposure; Pulsed exposure; Exposure mode

地址: [Li, Huixiang; Zhang, Weihao; Yan, Huimin] Wuhan Univ, Sch Resource & Environm Sci, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Hubei, Peoples R China.

[Gao, Pan] Huazhong Univ Sci & Technol, Coll Life Sci & Technol, Key Lab Mol Biophys, Minist Educ, Wuhan 430074, Hubei, Peoples R China.

[Li, Huixiang] Cent & Southern China Municipal Engn Design & Res, Jiefang Pk Ave, Wuhan 430063, Hubei, Peoples R China.

通讯作者地址: Gao, P (通讯作者)，Huazhong Univ Sci & Technol, Coll Life Sci & Technol, Key Lab Mol Biophys, Minist Educ, Wuhan 430074, Hubei, Peoples R China.

电子邮件地址: gaopan924989055@163.com

影响因子：7.6