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; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519080, China.
Chemosphere. 2022 Dec;308(Pt 1):136295. doi: 10.1016/j.chemosphere.2022.136295. Epub 2022 Sep 2.
Multiple environmental pressures caused by global warming and human activities have aroused widespread concern about PAHs pollution in tropical marine coral reef regions (CRRs). However, the trophodynamics of PAHs in the food webs of the CRRs and the related influence factors have not been reported. This study investigated the occurrence, trophic amplification, and transmission of PAHs in various organisms selecting between at least representative species for each level in CRRs of the South China Sea (SCS); revealed their driving mechanisms; and explored the trophodynamics of PAHs in the food web of the coral reef ecosystem. Results showed that more PAHs can be accumulated in the mantle tissue of Tridacnidae, and the proportion of mantle tissue of Tridacnidae increases with the increase of latitude (y = 0.01x + 0.17, R = 0.49, p < 0.05). Latitude drives the differential occurrence level and bioaccumulation of PAHs in tropical marine organisms, and also affects the trophodynamics of PAHs in aquatic ecosystem food webs. PAHs undergo trophic amplification in the food webs of tropical marine ecosystems represented by coral reefs, thus further aggravating the negative environmental impact on coral reef ecosystems. The cancer risk caused by accidental ingestion of PAHs by humans through consumption of seafood in CRRs is very low, but we should be alert to the biomagnification effect of PAHs.
全球变暖与人类活动导致的多种环境压力，使得人们对热带海洋珊瑚礁区（CRRs）中多环芳烃（PAHs）的污染问题产生了广泛关注。然而，CRRs 食物网中 PAHs 的营养动力学及其相关影响因素尚未有报道。本研究选取南海 CRRs 中至少每个层次的代表性物种，调查了不同生物体中 PAHs 的发生、营养放大和传递；揭示了它们的驱动机制；并探讨了珊瑚礁生态系统食物网中 PAHs 的营养动力学。结果表明，更多的 PAHs 可以在砗磲科动物的套膜组织中积累，并且套膜组织中 PAHs 的比例随着纬度的增加而增加（y = 0.01x + 0.17，R = 0.49，p < 0.05）。纬度驱动了热带海洋生物中 PAHs 的不同发生水平和生物累积，也影响了水生生态系统食物网中 PAHs 的营养动力学。PAHs 在以珊瑚礁为代表的热带海洋生态系统的食物网中发生营养放大，从而进一步加剧了对珊瑚礁生态系统的负面环境影响。人类通过食用 CRRs 中的海鲜意外摄入 PAHs 而导致的癌症风险非常低，但我们应该警惕 PAHs 的生物放大效应。
