Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
Chemosphere. 2024 Oct;365:143394. doi: 10.1016/j.chemosphere.2024.143394. Epub 2024 Sep 20.
The discharge of metal nanoparticles into the water inevitably poses a threat to aquatic organisms and the balance of the aquatic ecosystem. Photoperiod is one of the most important ecological factors for the development of cladocerans. In addition, different light conditions can also affect the toxicity of metal nanoparticles. In this study, we studied the effects of four photoperiods (8L/16D, 10L/14D, 14L/10D, and 16L/8D) combined with three concentrations of ZnO NPs (0 mg L, 0.05 mg L, and 0.10 mg L) on the growth and reproduction of Daphnia pulex. With the increase of photoperiod, the maternal body size and growth rate increased first and then decreased; the first time to reproduction was advanced, and broods and the total offspring also increased. Under the influence of ZnO NPs, growth rate and reproductive capacity were inhibited. The photoperiod 8L/16D and 16L/8D interacted with ZnO NPs on the growth of D. pulex, which significantly decreased the growth rate. Besides, the interaction between photoperiod 8L/16D and ZnO NPs decreased the reproduction ability of D. pulex. These results suggest that the effects of zinc oxide nanoparticles on the growth and reproduction of D. pulex is photoperiod dependent, which is useful for assessing the risk of pollutants to cladoceras under different light conditions.
将金属纳米颗粒排放到水中不可避免地会对水生生物和水生生态系统的平衡造成威胁。光周期是枝角类动物发育的最重要的生态因素之一。此外，不同的光照条件也会影响金属纳米颗粒的毒性。在这项研究中，我们研究了四种光周期（8L/16D、10L/14D、14L/10D 和 16L/8D）与三种 ZnO NPs 浓度（0mg/L、0.05mg/L 和 0.10mg/L）组合对大型溞（Daphnia pulex）生长和繁殖的影响。随着光周期的增加，母体体型和生长率先增加后减少；首次繁殖时间提前，且卵囊和总后代数量也增加。在 ZnO NPs 的影响下，生长率和繁殖能力受到抑制。光周期 8L/16D 和 16L/8D 与 ZnO NPs 相互作用对大型溞的生长有影响，显著降低了生长率。此外，光周期 8L/16D 和 ZnO NPs 的相互作用降低了大型溞的繁殖能力。这些结果表明，氧化锌纳米颗粒对大型溞生长和繁殖的影响依赖于光周期，这对于评估不同光照条件下污染物对枝角类动物的风险很有用。
