Antidepressants discharged into natural waters are likely to become a new type of endocrine pollutant, which may impact the interspecific relationship in aquatic ecosystem. Induced defense of cladocerans plays an important role in maintaining the balance of interspecific relationships between cladocerans and higher trophic levels. Here we studied the effects of antidepressant sertraline, a selective serotonin reuptake inhibitor, on the induced defensive traits of Ceriodaphnia cornuta in response to invertebrate predator Chaoborus larvae kairomone, including morphological defense and life history traits. We also conducted the predation experiments to check the selection rate of Chaoborus larvae during directly ingesting C. cornuta that were exposed to Chaoborus larvae kairomone at high concentration of sertraline. Results showed sertraline had an interference effect on the induced morphological defense of C. cornuta in response to Chaoborus larvae kairomone, i.e. the high concentration of sertraline (20 and 100 μg L⁻¹) significantly reduced the horns induction. However, the different concentrations of sertraline generally did not affect the life history traits of C. cornuta, regardless of presence or absence of Chaoborus larvae kairomone. The predation experiment demonstrated that the inhibition of sertraline on the induced morphological defense of C. cornuta can promote the feeding selective efficiency of Chaoborus larvae, and thus cause C. cornuta easily to be predated by Chaoborus larvae. Our results suggested that sertraline at the concentrations that are not direct harmful to life history traits of C. cornuta can seriously affect the predator-prey relationship, indicating that effects of pollutants on interspecific relationships should be considered comprehensively to avoid underestimating the potential risk of pollutants to ecosystems.

排入天然水中的抗抑郁药可能会成为一种新型的内分泌污染物，可能会影响水生生态系统的种间关系。锁骨的诱导防御在维持锁骨和较高营养水平之间的种间关系的平衡中起重要作用。在这里，我们研究了抗抑郁药舍曲林，选择性血清素再摄取抑制剂，对诱导防御特质的影响网纹枸骨响应无脊椎动物捕食Chaoborus幼虫利它，包括形态国防和生活史特征。我们还进行捕食的实验检查的选择率Chaoborus直接摄取期间幼虫C.枸骨暴露于高浓度舍曲林的潮虫幼虫海洛酮中。结果表明：舍曲林对的诱导形态学防御的干扰效应C.枸骨响应于Chaoborus幼虫利它素，舍曲林，即，高浓度（20和100μg大号^-1）显著降低的角诱导。然而，不同浓度的舍曲林的一般没有影响的生活史C.枸骨，无论是否存在Chaoborus幼虫利它。捕食实验表明舍曲林对角衣梭菌形态防御的抑制作用能促进进料选择性效率Chaoborus幼虫，并因此引起C.枸骨容易成由早Chaoborus幼虫。我们的研究结果表明，舍曲林的浓度不会直接危害角膜梭菌的生活史特征，但会严重影响食肉动物与猎物的关系，这表明应综合考虑污染物对种间关系的影响，以避免低估污染物的潜在风险。生态系统。