Abstract A total of 437 species (453 with infraspecific taxa) of algae and Cyanobacteria were identified in 2034 samples collected during the first research on nine thermokarst lakes in Yakutia carried out in 1986–1994 and 2001–2015. The richest algal flora was determined in Lake Aalah, represented by 241 taxa. Bacillariophyta species dominated in four lakes, whereas Chlorophyta and Cyanobacteria dominated in the others. The algal bioindication demonstrated preferences for benthic and plankticbenthic life, temperate temperature, low alkalinity, waters with moderate oxygenation, low to medium enrichment with chloride, low organic pollution, and mesotrophic state. Comparative floristic, CANOCO and JASP statistical methods divided the species and environmental variables into groups of lakes related to landscape terraces. Local landscape positions and high summer water temperatures may play a major role in the formation of algal flora. The index of algae taxa per area stabilized at about 70 species per km2. The highest polymorphism of algae floras, defined by the Subspecies/Species Index, was determined for the lakes of the Tungulunskaya terrace: Lake Ynakh, Lake Nal Tungulu and Lake Tungulu (1.041–1.058), and the average total flora was 1.036. Our results can help in monitoring and protecting the ecosystems of thermokarst lakes in Yakutia in the harsh climate environment of Northeastern Eurasia.

中文翻译：

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雅库特（俄罗斯东北部）热岩溶湖泊藻类和蓝藻的多样性和生态特征

摘要 在 1986-1994 年和 2001-2015 年对雅库特九个热喀斯特湖泊进行的首次研究期间，共采集了 2034 个样本，共鉴定出藻类和蓝藻 437 种（453 种具有种下分类群）。在阿拉湖中确定了最丰富的藻类植物群，以 241 个分类群为代表。四个湖泊中以芽孢杆菌属物种为主，而在其他湖泊中以绿藻门和蓝藻门为主。藻类生物指示表明对底栖和浮游底栖生物、温带温度、低碱度、中等含氧量、低至中等氯化物富集、低有机污染和中营养状态的偏好。比较植物区系、CANO​​CO 和 JASP 统计方法将物种和环境变量分为与景观梯田相关的湖泊组。当地的景观位置和夏季高水温可能在藻类植物群的形成中起主要作用。每个地区的藻类分类群指数稳定在每平方公里 70 种左右。由亚种/物种指数定义的藻类植物群的最高多态性是为 Tungulunskaya 阶地的湖泊确定的：Ynakh 湖、Nal Tungulu 湖和 Tungulu 湖（1.041-1.058），平均总植物群为 1.036。我们的研究结果有助于监测和保护欧亚大陆东北部恶劣气候环境中雅库特热岩溶湖泊的生态系统。确定了通古伦斯卡亚阶地的湖泊：伊纳赫湖、纳尔通古鲁湖和通古鲁湖 (1.041-1.058)，平均总植物群为 1.036。我们的研究结果有助于监测和保护欧亚大陆东北部恶劣气候环境中雅库特热岩溶湖泊的生态系统。确定了通古伦斯卡亚阶地的湖泊：伊纳赫湖、纳尔通古鲁湖和通古鲁湖 (1.041-1.058)，平均总植物群为 1.036。我们的研究结果有助于监测和保护欧亚大陆东北部恶劣气候环境中雅库特热岩溶湖泊的生态系统。