Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; Qingdao Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation, The First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China.
Qingdao Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation, The First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China; Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao, 266071, China.
Environ Res. 2024 Nov 15;261:119646. doi: 10.1016/j.envres.2024.119646. Epub 2024 Jul 18.
Domoic acid (DA) is a neurotoxin produced by marine microalgae. It tends to accumulate in marine shellfish and fish, posing a threat to aquaculture and seafood consumers' health. In this study, DA in the surface and bottom seawater, sediment, and porewater of the Jiaozhou Bay, a typical mariculture bay in China, was systematically investigated for the first time over different seasons. Surprisingly, a high concentration of DA was discovered in the marine sediment porewater (maximum detected concentration: 289.49 ng/L) for the first time. DA was found to be extensively distributed in the water body and sedimentary environment of the Jiaozhou Bay. DA in the surface and bottom seawater of Jiaozhou Bay in spring was uniformly distributed, whereas DA showed obvious spatial variations in summer and winter. The high concentration areas of DA are located in the north of Jiaozhou Bay and decreased to the south areas. DA was also distributed in the sediment (spring mean: 316.57 ng/kg; summer mean: 10.22 ng/kg; winter mean: 237.08 ng/kg) and porewater (spring mean: 129.70 ng/L; summer mean: 53.54 ng/L; winter mean: 19.90 ng/L) of Jiaozhou Bay. The DA concentrations in the surface sediment and porewater were higher in the spring than in the winter and summer, contrary to the seasonal variation pattern observed in the surface and bottom seawater. The DA concentration in porewater was significantly higher than in the surface and bottom seawater, indicating that the risk of pollution contamination from DA to benthic fishery organisms may be underestimated. Overall, DA is widely distributed in the seawater and also in the benthic environment of Jiaozhou Bay and exhibited potential harm to fishery organisms varied greatly with seasons. It is an important discovery for marine algae toxins and has important guiding significance and important indicative role for the routine monitoring and management of DA pollution in water and benthic environment.
本文首次系统研究了不同季节胶州湾海水、沉积物和孔隙水中的软骨藻酸（DA）分布情况。研究结果表明，海洋沉积物孔隙水中的 DA 浓度较高（最高检出浓度：289.49ng/L），DA 在胶州湾水体和沉积物环境中广泛分布。春、夏季，胶州湾近岸海域和底层海水中 DA 分布均匀，而冬季 DA 空间分布差异较大。高浓度 DA 区域位于胶州湾北部，向南逐渐减少。此外，DA 还分布于胶州湾沉积物（春季均值：316.57ng/kg；夏季均值：10.22ng/kg；冬季均值：237.08ng/kg）和孔隙水中（春季均值：129.70ng/L；夏季均值：53.54ng/L；冬季均值：19.90ng/L）。春季，表层沉积物和孔隙水中的 DA 浓度均高于冬季和夏季，与表层和底层海水的季节变化模式相反。孔隙水中的 DA 浓度显著高于表层和底层海水，表明 DA 对底栖渔业生物污染的风险可能被低估。总之，DA 在胶州湾海水和底栖环境中广泛分布，且不同季节对渔业生物的潜在危害存在显著差异。该研究结果为海洋藻类毒素的研究提供了重要发现，对常规监测和管理水和底栖环境中 DA 污染具有重要的指导意义和重要的指示作用。
