Chen Qi, Jin Luqi, Zhong Yuan, Ji Gaohua
National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China.
Engineering Research Center of Environmental DNA and Ecological Water Health Assessment, Shanghai Ocean University, Shanghai 201306, China.
Antibiotics (Basel). 2022 Jul 29;11(8):1020. doi: 10.3390/antibiotics11081020.
Enrofloxacin (ENR) is a member of quinolones, which are extensively used in livestock farming and aquaculture to fight various bacterial diseases, but its residues are partially transferred to surface water and affect the local aquatic ecosystem. There are many studies on the effect of ENR on the growth of a single aquatic species, but few on the level of the aquatic community. Epiphytic algae, which are organisms attached to the surface of submerged plants, play an important role in the absorption of nitrogen and phosphorus in the ecological purification pond which are mainly constructed by submerged plants, and are commonly used in aquaculture effluent treatment. Enrofloxacin (ENR) is frequently detected in aquaculture ponds and possibly discharged into the purification pond, thus imposing stress on the pond ecosystem. Here, we performed a microcosm experiment to evaluate the short-term effects of pulsed ENR in different concentrations on the epiphytic algal communities growing on . Our results showed an overall pattern of "low-dose-promotion and high-dose-inhibition", which means under low and median ENR concentrations, the epiphytic algal biomass was promoted, while under high ENR concentrations, the biomass was inhibited. This pattern was mainly attributed to the high tolerance of filamentous green algae and yellow-green algae to ENR. Very low concentrations of ENR also favored the growth of diatoms and cyanobacteria. These results demonstrate a significant alteration of epiphytic algal communities by ENR and also spark further research on the potential use of filamentous green algae for the removal of ENR in contaminated waters because of its high tolerance.
恩诺沙星（ENR）是喹诺酮类药物的一种，广泛应用于畜牧业和水产养殖业以对抗各种细菌性疾病，但其残留物会部分转移至地表水并影响当地水生生态系统。关于ENR对单一水生物种生长影响的研究众多，但针对水生群落层面的研究较少。附生藻类是附着在沉水植物表面的生物，在以沉水植物为主构建的生态净化池中对氮和磷的吸收起着重要作用，常用于养殖废水处理。在水产养殖池塘中经常检测到恩诺沙星（ENR），并且可能排放到净化池中，从而给池塘生态系统带来压力。在此，我们进行了一项微观实验，以评估不同浓度的脉冲式ENR对生长在……上的附生藻类群落的短期影响。我们的结果呈现出“低剂量促进、高剂量抑制”的总体模式，即在低和中等ENR浓度下，附生藻类生物量得到促进，而在高ENR浓度下，生物量受到抑制。这种模式主要归因于丝状绿藻和黄绿藻对ENR的高耐受性。极低浓度的ENR也有利于硅藻和蓝细菌的生长。这些结果表明ENR对附生藻类群落有显著改变，同时也引发了对丝状绿藻因其高耐受性而在受污染水体中去除ENR潜在用途的进一步研究。
