Section for Oceans and Arctic, National Institute of Aquatic Resources, Technical University of Denmark, Denmark.
Arctic Research Centre, Department of Bioscience, Aarhus University, Denmark.
Aquat Toxicol. 2018 May;198:287-293. doi: 10.1016/j.aquatox.2018.03.011. Epub 2018 Mar 12.
Microplastic (MP) leads to widespread pollution in the marine ecosystem. In addition to the physical hazard posed by ingestion of microplastic particles, concern is also on their potential as vector for transport of hydrophobic contaminants. We experimentally studied the single and interactive effects of microplastic and pyrene, a polycyclic aromatic hydrocarbon, on the swimming behaviour and predatory performance of juvenile barramundi (Lates calcarifer). Juveniles (18+ days post hatch) were exposed to MPs, or pyrene (100 nM), or combination of both, and feeding rate and foraging activity (swimming) were analysed. Exposure to MPs alone did not significantly influence feeding performance of the juveniles, while a dose-effect series of pyrene showed strong effect on fish behaviour when concentrations were above 100 nM. In the test of combined MP and pyrene exposure, we observed no effect on feeding while swimming speed decreased significantly. Thus, our results confirm that short-time exposure to pyrene impacts the performance of fish juveniles, while additional exposure to microplastic at the given conditions influenced their activity only and not their feeding rate. Further studies of the combined effects of microplastics and pollutants on tropical fish behaviour are encouraged.
微塑料（MP）导致海洋生态系统广泛污染。除了摄入微塑料颗粒带来的物理危害外，人们还关注它们作为疏水性污染物载体的潜在风险。我们通过实验研究了微塑料和多环芳烃芘对幼年尖吻鲈（Lates calcarifer）游泳行为和捕食性能的单一和交互影响。将 18 天以上的幼鱼暴露于微塑料、芘（100nM）或两者的混合物中，并分析摄食率和觅食活动（游泳）。单独暴露于微塑料对幼鱼的摄食性能没有显著影响，而当浓度高于 100nM 时，一系列芘的剂量效应对鱼类行为有强烈影响。在联合暴露于微塑料和芘的测试中，我们观察到摄食没有受到影响，而游泳速度显著下降。因此，我们的结果证实，短期暴露于芘会影响鱼类幼体的性能，而在给定条件下额外暴露于微塑料只会影响它们的活动，而不会影响它们的摄食率。鼓励进一步研究微塑料和污染物对热带鱼类行为的联合影响。
