Abstract：
Airborne Organic Pollutants (AOPs) reach remote oceanic regions after long range atmospheric transport and deposition, incorporating into natural microbial communities. This study investigated the effects of AOPs on natural microbial communities of the Mediterranean Sea, the Atlantic Ocean and the Bellingshausen Sea, by assessing the impact of both non-polar and polar AOPs on cell abundances, chlorophyll a concentrations and cell viabilities of different microbial groups. Our results indicate that almost all groups, except flagellates in the Bellingshausen Sea, were significantly affected by AOPs. While no significant differences in chlorophyll a concentrations were observed between non-polar and polar AOPs, significant variations in cell abundances were noted. Cell death occurred at AOP concentrations as low as five times the oceanic field levels, likely due to their high chemical activity. Cyanobacteria in temperate waters exhibited the highest sensitivity to AOPs, whereas medium and larger diatoms in the Bellingshausen Sea were more affected than smaller diatoms or flagellates, contrary to the expected size-related sensitivity trend. Additionally, microorganisms in temperate waters were more sensitive to the polar fraction of AOPs compared to the non-polar fraction, which showed an inverse sensitivity pattern. This differential sensitivity is attributed to variations in the ratio of polar to non-polar AOPs in the respective environments. Our findings underscore the varying impacts of AOPs on marine microbial communities across different oceanic regions.
摘要：
空气传播的有机污染物（AOPs）经过远距离的大气迁移和沉积后到达偏远的海洋地区，融入天然微生物群落。这项研究调查了AOPs对地中海天然微生物群落的影响，大西洋和贝林斯豪森海,通过评估非极性和极性AOPs对细胞丰度的影响，不同微生物群的叶绿素a浓度和细胞活力。我们的结果表明，几乎所有的群体，除了Bellingshausen海的鞭毛虫,受到AOPs的显著影响。虽然在非极性和极性AOPs之间没有观察到叶绿素a浓度的显着差异，注意到细胞丰度的显着变化。细胞死亡发生在AOP浓度低至海洋场水平的五倍时，可能是由于它们的高化学活性。温带水域蓝藻对AOPs的敏感性最高，而贝灵斯豪森海的中等和较大的硅藻比较小的硅藻或鞭毛虫受到的影响更大，与预期的与尺寸相关的敏感性趋势相反。此外,与非极性部分相比，温带水域中的微生物对AOPs的极性部分更敏感，显示出相反的敏感度模式。这种不同的灵敏度归因于相应环境中极性与非极性AOP的比率的变化。我们的发现强调了AOPs对不同海洋区域海洋微生物群落的不同影响。
