College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China.
College of Marine Resources & Environment, Hebei Normal University of Science & Technology, Qinhuangdao 066600, China.
Mar Pollut Bull. 2022 Apr;177:113561. doi: 10.1016/j.marpolbul.2022.113561. Epub 2022 Mar 16.
Macroalgal blooms have become a serious threat to public health, fisheries, ecosystems, and global economies. Since 2007, in the Yellow Sea, China, Ulva green tides have occurred for 15 consecutive years. However, effective control methods are limited. Ulva prolifera attached to Neopyropia aquaculture rafts are believed to be the main source of blooms, therefore eliminating Ulva from rafts could effectively prevent and control blooms. We investigated this phenomenon and showed that macroalgae germination was significantly inhibited by dried Neopyropia yezoensis at concentrations of 1.2, 2.4, and 4.8 g DW. Also, the inhibitory effects of dried N. yezoensis toward U. prolifera gametes at 2.4 and 4.8 g DW were >90% at day 21. N. yezoensis culture filtrates and thalli were also used to determine dose-dependent inhibition effects on U. prolifera gamete germination. Both were potent and significantly inhibited germination at 1.75-7 g FW; the inhibitory effect 7 g FW was >90% at day 21. As N. yezoensis thalli exhibited high inhibitory effects in laboratory experiments, we also performed field studies. N. yezoensis on ropes displayed high inhibitory effects on Ulva attachment and growth. Thus N. yezoensis powder, culture filtrates, and thalli displayed strong inhibitory effects on U. prolifera gametes, suggesting N. yezoensis attachment to ropes could be used to control green tides at the source.
大型藻类的爆发已经对公众健康、渔业、生态系统和全球经济构成了严重威胁。自 2007 年以来，中国黄海已经连续 15 年出现浒苔绿潮。然而，有效的控制方法有限。附着在养殖筏架上的石莼可能是绿潮暴发的主要来源，因此，从筏架上清除石莼可以有效地预防和控制绿潮。我们对这一现象进行了调查，结果表明，在 1.2、2.4 和 4.8 g DW 等不同浓度下，干石莼对大型藻类的萌发有明显的抑制作用。同时，在 2.4 和 4.8 g DW 下，干石莼对石莼配子的抑制作用>90%，第 21 天达到最高。我们还利用石莼培养液和藻体来测定其对石莼配子萌发的抑制作用，结果显示，培养液和藻体都表现出剂量依赖性的抑制效果，在 1.75-7 g FW 时，抑制效果明显，第 21 天抑制率>90%。由于石莼藻体在实验室实验中表现出很高的抑制效果，我们还进行了野外研究。绳索上的石莼对石莼的附着和生长有很高的抑制作用。因此，石莼粉、培养液和藻体对石莼配子有很强的抑制作用，这表明将石莼附着在绳索上可能是一种从源头控制绿潮的方法。
