Chiba Takashi, Horie Yoshifumi, Tuji Akihiro
College of Agriculture, Food and Environment Sciences, Department of Environmental and Symbiotic Science, Rakuno Gakuen University, Bunkyodai 582, Midorimachi, Ebetsu, Hokkaido 069-8501, Japan Rakuno Gakuen University Ebetsu Japan.
Research Center for Inland Seas (KURCIS), Kobe University, Fukaeminami-machi, Higashinada-ku, Kobe, Hyogo 658-0022, Japan Kobe University Kobe Japan.
PhytoKeys. 2023 Jul 18;229:139-155. doi: 10.3897/phytokeys.229.104449. eCollection 2023.
The ecologies (salinity tolerance) of many diatoms are largely unknown, despite their potential to contribute to more detailed paleoenvironmental reconstructions. This study therefore aimed to investigate the relationship between diatom species and salinity. We cultured seven cosmopolitan benthic diatom species obtained from Lake Akan, a freshwater inland lake in Japan: , , , , , sp. and . Each species was cultured at eleven salinities between 0‰ and 50‰. , and had the highest growth rate at a salinity of 3‰, with no further increase observed above 25‰. However, had the highest growth rate at a salinity of 5‰, with no increase at salinities ≥ 30‰. These results suggest that , , , and grow in freshwater to brackish-water environments. and sp. proliferated at all salinities, indicating that they can adapt to hypersaline environments. However, did not survive in salinities >10‰, making it the species with the narrowest salinity tolerance range. These results provide new knowledge that improves the understanding of the ecology of these species in modern environments and offer insights into paleoenvironmental reconstructions through diatom analysis.
尽管许多硅藻的生态特征（耐盐性）对更详细的古环境重建有潜在贡献，但很大程度上仍不为人知。因此，本研究旨在调查硅藻物种与盐度之间的关系。我们培养了从日本淡水内陆湖阿寒湖获得的七种世界性底栖硅藻物种： 、 、 、 、 、 种和 。每个物种在0‰至50‰的11种盐度下进行培养。 、 和 在盐度为3‰时生长速率最高，在25‰以上未观察到进一步增长。然而， 在盐度为5‰时生长速率最高，在盐度≥30‰时没有增长。这些结果表明， 、 、 和 在淡水到微咸水环境中生长。 和 种在所有盐度下都能增殖，表明它们能适应高盐环境。然而， 在盐度>10‰时无法存活，使其成为耐盐范围最窄的物种。这些结果提供了新的知识，增进了对这些物种在现代环境中生态的理解，并为通过硅藻分析进行古环境重建提供了见解。
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