Seafloor massive sulfide (SMS) deposits are the target of available metallic resources. The toxic impacts of leachable metals from hydrothermal ore by mining operations in marine environments are a concern. However, ecotoxicological knowledge about marine algae, and particularly open ocean species, is still limited. Here, we evaluated the toxic effects of three leachable metals (i.e. Zn, Cu, and Pb) on seven marine algae, including cyanobacteria and eukaryotes, by a delayed fluorescence method. Cyanobacterial Synechococcus and Cyanobium species were sensitive to Zn and Cu, while eukaryotic algae showed various responses to heavy metal species. The prasinophycean Bathycoccus prasinos NIES‐2670 was sensitive to all metal species; this strain is a potential test strain to detect the leachable metals. A co‐culture experiment showed that the impact on community structure varies depending on leachable metal species. This study demonstrates that surveys across multiple taxonomic groups are necessary to assess the impact of SMS‐mining operations on marine ecosystems as a whole.

中文翻译：

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基于延迟荧光分析的来自 NIES 培养物保藏中心的七种藻类的不同重金属敏感性

海底块状硫化物 (SMS) 矿床是可用金属资源的目标。海洋环境中的采矿作业从热液矿石中可浸出的金属的毒性影响令人担忧。然而，关于海藻，特别是公海物种的生态毒理学知识仍然有限。在这里，我们通过延迟荧光方法评估了三种可浸出金属（即锌、铜和铅）对七种海藻（包括蓝藻和真核生物）的毒性作用。蓝藻聚球藻和蓝藻物种对锌和铜敏感，而真核藻类对重金属物种表现出不同的反应。prasinophycean Bathycoccus prasinos NIES-2670 对所有金属物种敏感；该菌株是检测可浸出金属的潜在测试菌株。一项共培养实验表明，对群落结构的影响因可浸出金属种类而异。这项研究表明，需要对多个分类群进行调查，以评估 SMS 采矿作业对整个海洋生态系统的影响。