Institute of Oceanography, Vietnam Academy of Science and Technology, Nha Trang, Vietnam.
IOC Science and Communication Centre on Harmful Algae, Marine Biological Section, University of Copenhagen, Copenhagen Ø, Denmark.
J Phycol. 2023 Jun;59(3):496-517. doi: 10.1111/jpy.13326. Epub 2023 Mar 27.
Viet Nam has a coastline of 3200 km with thousands of islands providing diverse habitats for benthic harmful algal species including species of Gambierdiscus. Some of these species produce ciguatera toxins, which may accumulate in large carnivore fish potentially posing major threats to public health. This study reports five species of Gambierdiscus from Vietnamese waters, notably G. australes, G. caribaeus, G. carpenteri, G. pacificus, and G. vietnamensis sp. nov. All species are identified morphologically by LM and SEM, and identifications are supported by molecular analyses of nuclear rDNA (D1-D3 and D8-D10 domains of LSU, SSU, and ITS1-5.8S-ITS2 region) based on cultured material collected during 2010-2021. Statistical analyses of morphometric measurements may be used to differentiate some species if a sufficiently large number of cells are examined. Gambierdiscus vietnamensis sp. nov. is morphologically similar to other strongly reticulated species, such as G. belizeanus and possibly G. pacificus; the latter species is morphologically indistinguishable from G. vietnamensis sp. nov., but they are genetically distinct, and molecular analysis is deemed necessary for proper identification of the new species. This study also revealed that strains denoted G. pacificus from Hainan Island (China) should be included in G. vietnamensis sp. nov.
越南拥有 3200 公里的海岸线，数千个岛屿为底栖有害藻类物种提供了多样的栖息地，包括 Gambierdiscus 物种。其中一些物种产生雪卡毒素，这些毒素可能在大型食肉鱼类中积累，对公共健康构成重大威胁。本研究报告了来自越南水域的 Gambierdiscus 的五个物种，特别是 Gambierdiscus australes、Gambierdiscus caribaeus、Gambierdiscus carpenteri、Gambierdiscus pacificus 和 Gambierdiscus vietnamensis sp. nov. 所有物种均通过 LM 和 SEM 进行形态学鉴定，并通过基于培养材料的核 rDNA（LSU、SSU 和 ITS1-5.8S-ITS2 区域的 D1-D3 和 D8-D10 结构域）的分子分析得到支持，这些材料是在 2010-2021 年期间收集的。如果检查足够数量的细胞，则可以使用形态测量值的统计分析来区分一些物种。 Gambierdiscus vietnamensis sp. nov. 在形态上与其他强烈网状物种相似，例如 Gambierdiscus belizeanus 和可能的 Gambierdiscus pacificus；后者在形态上与 Gambierdiscus vietnamensis sp. nov. 无法区分，但它们在遗传上是不同的，需要分子分析才能正确鉴定新物种。本研究还表明，来自中国海南岛的被标记为 Gambierdiscus pacificus 的菌株应归入 Gambierdiscus vietnamensis sp. nov.
