Han Minwei, Zhang Ruijie, Yu Kefu, Li An, Wang Yinghui, Huang Xueyong
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.
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.
J Hazard Mater. 2020 Feb 15;384:121299. doi: 10.1016/j.jhazmat.2019.121299. Epub 2019 Sep 24.
Coral reefs have suffered degradation from climate change and water quality deterioration. Studies have shown that PAHs are present widely in some coastal seawater and coral tissues. However, no studies have focused on the PAHs in coastal coral mucus and offshore coral tissues. Targeting the South China Sea, this study for the first time investigated the occurrence, tissue-mucus partitioning, and bioaccumulation of PAHs in coastal and offshore corals. The tissue and mucus of the corals were processed separately. The results indicated that the total concentration of 15 of the 16 PAHs that are prioritized by U.S. EPA (excluding naphthalene) (∑PAHs) was significantly higher in the coastal tissues (173 ± 314 ng g dw) than in the offshore tissues (71 ± 109 ng g dw), as well as in coastal seawater (196 ± 96 ng L) than in the offshore water (54 ± 9 ng L). ∑PAHs is two orders of magnitude higher in the mucus (3200 ± 6470 ng g dw) than in the tissues (128 ± 43 ng g dw). By average, 29% of ∑PAHs were accumulated in the mucus. The results suggest that mucus plays an important role in the bioaccumulation of PAHs by corals from ambient seawater.
珊瑚礁因气候变化和水质恶化而退化。研究表明，多环芳烃广泛存在于一些沿海海水和珊瑚组织中。然而，尚无研究聚焦于沿海珊瑚黏液和近海珊瑚组织中的多环芳烃。本研究以南海为对象，首次调查了沿海和近海珊瑚中多环芳烃的存在情况、组织 - 黏液分配及生物累积情况。珊瑚的组织和黏液被分别处理。结果表明，美国环境保护局优先关注的16种多环芳烃中的15种（不包括萘）的总浓度（∑PAHs）在沿海组织（173±314 ng g干重）中显著高于近海组织（71±109 ng g干重），在沿海海水中（196±96 ng L）也显著高于近海水体（54±9 ng L）。∑PAHs在黏液中的含量（3200±6470 ng g干重）比在组织中的含量（128±43 ng g干重）高两个数量级。平均而言，29%的∑PAHs累积在黏液中。结果表明，黏液在珊瑚从周围海水中生物累积多环芳烃的过程中起着重要作用。
