Departamento de Biología, Facultad de Ciencias, Universidad de las Islas Baleares. Palma, Spain.
Centro de Genómica Ecología y Medio Ambiente, Universidad Mayor. Santiago, Chile; Institute of Environment, Florida International University, Miami, United States of America.
Chemosphere. 2024 Sep;364:143085. doi: 10.1016/j.chemosphere.2024.143085. Epub 2024 Aug 13.
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.
空气传播有机污染物（AOPs）在长距离大气输送和沉积后到达偏远海洋区域，并融入自然微生物群落。本研究通过评估非极性和极性 AOPs 对不同微生物群体的细胞丰度、叶绿素 a 浓度和细胞活力的影响，研究了 AOPs 对地中海、大西洋和别林斯高晋海的自然微生物群落的影响。我们的结果表明，除了别林斯高晋海的鞭毛藻外，几乎所有群体都受到 AOPs 的显著影响。虽然非极性和极性 AOPs 之间的叶绿素 a 浓度没有显著差异，但细胞丰度存在显著变化。细胞死亡发生在 AOP 浓度低至海洋现场水平的五倍，这可能是由于它们的高化学活性。温带水域的蓝藻对 AOPs 表现出最高的敏感性，而别林斯高晋海中的中型和大型硅藻比小型硅藻或鞭毛藻受到的影响更大，这与预期的与大小相关的敏感性趋势相反。此外，与非极性部分相比，温带水域的微生物对 AOPs 的极性部分更敏感，这显示出相反的敏感性模式。这种差异敏感性归因于不同环境中极性和非极性 AOPs 的比例变化。我们的研究结果强调了 AOPs 对不同海洋区域海洋微生物群落的不同影响。
