Guangxi Laboratory on the Study of Coral Reefs in the South China Sea; Coral Reef Research Center of China, School of Marine Sciences, Guangxi University, Nanning, 530004, China; Environmental and Occupational Health Sciences, School of Public Health, University of Illinois at Chicago, Chicago, 60612, USA.
Guangxi Laboratory on the Study of Coral Reefs in the South China Sea; Coral Reef Research Center of China, School of Marine Sciences, Guangxi University, Nanning, 530004, China.
Environ Pollut. 2019 Jul;250:503-510. doi: 10.1016/j.envpol.2019.04.036. Epub 2019 Apr 13.
Manmade antibiotics are emerging organic pollutants widely detected in the marine environment. In this study, 14 out of 19 target antibiotics were detected in corals collected from coastal and offshore regions in the South China Sea. The average total antibiotic concentrations (∑ABs) in the two regions were similar: 28 ng/g for coastal corals and 31 ng/g for offshore corals, based on dry tissue weight (dw). Fluoroquinolones (FQs) were predominant antibiotics in the coastal corals (mean ∑FQs: 18 ng/g dw), while sulfonamides (SAs) predominated in the offshore corals (mean ∑SAs: 23 ng/g dw). However, corals living in coastal regions tend to excrete more mucus than corals in offshore habitat. We found 53% by average of ∑ABs in the mucus of the coastal corals; while in offshore corals, most antibiotics (88% by average) were accumulated in the tissues. In addition, the tissue-mucus mass distribution differs among individual antibiotics. Sulfonamides were mainly accumulated in tissues while fluoroquinolones were present mainly in mucus. The results of this study suggest that mucus played an important role in the bioaccumulation of antibiotics by corals. It may resist the bioaccumulation of antibiotics by coral tissue, especially for the coastal corals. Additionally, corals were compared with other marine biotas in the study area and found to be more bioaccumulative towards antibiotics.
人工合成抗生素是广泛存在于海洋环境中的新兴有机污染物。本研究在南海沿海和近海地区采集的珊瑚中检测到了 19 种目标抗生素中的 14 种。这两个地区的总抗生素浓度（∑ABs）相似：沿海珊瑚的平均总抗生素浓度为 28ng/g（基于干组织重量（dw）），近海珊瑚的平均总抗生素浓度为 31ng/g。氟喹诺酮类（FQs）是沿海珊瑚中主要的抗生素（∑FQs 的平均值：18ng/g dw），而磺胺类（SAs）则是近海珊瑚中的主要抗生素（∑SAs 的平均值：23ng/g dw）。然而，生活在沿海地区的珊瑚比生活在近海生境中的珊瑚更容易分泌更多的黏液。我们发现，沿海珊瑚的黏液中∑ABs 的平均含量为 53%；而在近海珊瑚中，大多数抗生素（平均 88%）都积聚在组织中。此外，不同抗生素在组织-黏液中的质量分布也不同。磺胺类抗生素主要积聚在组织中，而氟喹诺酮类抗生素主要存在于黏液中。本研究结果表明，黏液在珊瑚对抗生素的生物积累中起着重要作用。它可能会抑制珊瑚组织对抗生素的生物积累，特别是对沿海珊瑚。此外，与研究区域内的其他海洋生物群比较发现，珊瑚对抗生素的生物积累能力更强。
