Norfloxacin disrupts Daphnia magna-induced colony formation in Scenedesmus quadricauda and facilitates grazing
Norfloxacin disrupts Daphnia magna-induced colony formation in Scenedesmus quadricauda and facilitates grazing
复制标题
诺氟沙星破坏大型水蚤诱导的四尾栅藻菌落形成并促进放牧
DOI：
10.1016/j.ecoleng.2017.02.037
复制
发表时间：
2017
影响因子：
3.8
通讯作者：
Duan Changqun
中科院分区：
文献类型：
--
作者：
Pan Ying;Liu Change;Li Feng;Zhou Changqi;Yan Shiwei;Dong Jinyan;Li Tingrong;Duan Changqun
环境污染物会对食草动物诱导的浮游植物防御产生负面影响，并导致浮游植物-浮游动物关系的破坏。然而，目前尚不清楚诺氟沙星（NOR）这种广泛使用的抗生素在释放到环境中时是否会对浮游生物系统产生这种影响。本研究研究了不同浓度（0、50、500、5000和50万ug L−1）下绿藻（ascenedesmus quadricaudaas）的集落形成能力，以及大鳞藻（cladoceranDaphnia magna）的行为（跳跃频率和静止时间）和放牧率，以确定NOR对其的影响。quadricauda-D。magnarelationship。菌落大小一般不受NOR的影响，但在添加食草动物的胁迫下显著增加；然而，与只添加食草动物相比，添加食草动物和增加NOR浓度的综合效应导致菌落大小持续下降。d .跳跃频率与游泳时间。随着NOR浓度的增加，个体数量减少，放牧率增加。因此，NOR似乎抑制了食草动物诱导的菌落形成。导致更多的藻类细胞被食草动物消耗，尽管抑制了食草动物的摄食行为。考虑到浮游植物-浮游动物相互作用在决定水生生态系统的生态过程中起着重要作用，NOR污染对生态系统功能的影响可能比以前认识到的更大。
Environmental pollutants can negatively affect grazer-induced defenses in phytoplankton species and lead to the disruption of phytoplankton-zooplankton relationships. However, it is still not known whether norfloxacin (NOR), a widely used antibiotic, has such effects on plankton systems when released into the environment. Here, we investigated the colony-forming ability of the green algaScenedesmus quadricaudaas well as the behavior (hopping frequency and duration of quiescence) and grazing rate of the cladoceranDaphnia magna, when exposed to different NOR concentrations (0, 50, 500, 5000 and 50,00 ug L−1), to determine the effects of NOR on theS. quadricauda-D. magnarelationship. Colony size was generally unaffected by NOR but significantly increased when subjected to the stress of adding grazers; however, the combined effects of adding grazers and increasing NOR concentrations led to consistently decreased colony size compared to only adding grazers. The hopping frequency and the time spent on swimming ofD. magnaindividuals decreased while their grazing rate increased with increasing NOR concentrations. Thus, NOR seemed to inhibit grazer-induced colony formation inS. quadricauda, resulting in more algal cells being consumed by grazers, despite inhibiting grazers’ feeding behavior. Considering that phytoplankton-zooplankton interaction plays an important role in determining ecological process of aquatic ecosystems, ecosystem function might be more affected by NOR contamination than previously recognized.