Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
J Hazard Mater. 2015 Jun 15;290:96-105. doi: 10.1016/j.jhazmat.2015.02.059. Epub 2015 Feb 21.
Residual antibiotics from aquacultural farming may alter microbial community structure in aquatic environments in ways that may adversely or positively impact microbially-mediated ecological functions. This study investigated 26 ponds (26 composited samples) used to produce fish, razor clam and shrimp (farming and drying) and 2 channels (10 samples) in a saltwater aquacultural farm in southern China to characterize microbial community structure (represented by phospholipid fatty acids) in surface sediments (0-10 cm) with long-term exposure to residual antibiotics. 11 out of 14 widely-used antibiotics were quantifiable at μg kg(-1) levels in sediments but their concentrations did not statistically differ among ponds and channels, except norfloxacin in drying shrimp ponds and thiamphenicol in razor clam ponds. Concentrations of protozoan PLFAs were significantly increased in sediments from razor clam ponds while other microbial groups were similar among ponds and channels. Both canonical-correlation and stepwise-multiple-regression analyses on microbial community and residual antibiotics suggested that roxithromycin residuals were significantly related to shifts in microbial community structure in sediments. This study provided field evidence that multiple residual antibiotics at low environmental levels from aquacultural farming do not produce fundamental shifts in microbial community structure.
水产养殖中的残留抗生素可能会以不利或有利的方式改变水生环境中的微生物群落结构，从而影响微生物介导的生态功能。本研究调查了中国南方一个海水养殖场的 26 个池塘（26 个组合样本）和 2 个渠道（10 个样本），这些池塘用于养殖鱼类、 razor clam 和虾（养殖和干燥），以描述长期暴露于残留抗生素的表层沉积物（0-10cm）中的微生物群落结构（用磷脂脂肪酸表示）。在沉积物中可以定量检测到 14 种常用抗生素中的 11 种，其浓度在池塘和渠道之间没有统计学差异，除了干燥虾塘中的诺氟沙星和 razor clam 塘中的噻苯咪唑。来自 razor clam 塘的沉积物中原生动物 PLFA 的浓度显著增加，而其他微生物群在池塘和渠道之间相似。微生物群落和残留抗生素的典范对应和逐步多元回归分析表明，罗红霉素残留与沉积物中微生物群落结构的变化显著相关。本研究提供了现场证据，表明水产养殖中低环境水平的多种残留抗生素不会导致微生物群落结构的根本变化。
