Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Irkutsk 664033, Russia.
Institute for Biological Problems of Cryolithozone, Siberian Branch of the Russian Academy of Science, Yakutsk 677980, Russia.
Eur J Protistol. 2023 Aug;90:125975. doi: 10.1016/j.ejop.2023.125975. Epub 2023 Jun 17.
Maintaining high levels of biological diversity in various ecosystems is necessary for stable functioning of the Earth's biosphere. The article describes diversity and ecology of heterotrophic siliceous protists - rotosphaerids, colourless free-living thaumatomonad flagellates, and centrohelid heliozoans - in Arctic waters located of Asian Russia. Samples were collected in the mouths of the Olenyok, Yana, Indigirka, Kolyma Rivers - and small freshwater ponds near Settlement of Tiksi in Yakutia. Based on electron microscopy, 35 centrohelids (Heliozoa), 11 rotosphaerid species as well as four thaumatomonad flagellate species were found in the region. Seven species were recorded in Russia for the first time: Rabdiaster multicosta, Rabdiaster reticulata, Turriplaca denticulata, Choanocystis cf. cordiformis parvula, Raineriophrys pteromorphos, Pseudoraphidocystis glutinosa and Pseudoraphidiophrys formosa. For 43 species, the study area is the most northern location they were described. Morphological details of scales are discussed for selected species, particularly for widespread species of rotosphaerids - Pinaciophora fluviatilis. The literature on hydrochemical conditions was analyzed to find taxa with high sensitivity towards environmental changes. Such species could be further used for monitoring plankton, recovering evolutionary changes, and reconstructing past environments.
维持各种生态系统中的高生物多样性对于地球生物圈的稳定运行是必要的。本文描述了俄罗斯亚洲地区北极水域中异养硅质原生动物 - 旋轮虫、无色自由生活的滴虫和中心体原生动物的多样性和生态学。样品采集于奥连伊克、亚纳、因迪吉尔卡、科雷马河的河口以及雅库茨克的提克西定居点附近的小淡水池塘。基于电子显微镜，在该地区发现了 35 种中心体（原生动物）、11 种旋轮虫物种以及 4 种滴虫物种。有 7 种物种是首次在俄罗斯被记录到：多刺 Rabdiaster、网状 Rabdiaster、具齿 Turriplaca、拟心形 Choanocystis cf. cordiformis parvula、翼形 Raineriophrys、胶质假腔藻和美丽假腔藻。对于 43 种物种来说，该研究区域是它们被描述的最北位置。选择了一些具有代表性的旋轮虫物种，特别是广泛分布的 Pinaciophora fluviatilis，讨论了鳞片的形态细节。分析了有关水化学条件的文献，以寻找对环境变化高度敏感的分类单元。这些物种可以进一步用于监测浮游生物、恢复进化变化和重建过去的环境。
