Abstract Eight species of charophytes have been found in the vast area of the ubiquitous permafrost in Far North-East Asia (i.e. the Republic of Sakha (Yakutia), the Magadan Region, and the Chukotka Autonomous Area, Russia): Chara contraria, C. globularis, C. strigosa, C. virgata, Nitella flexilis, N. opaca, N. wahlbergiana and Tolypella canadensis. Charophytes are found in a variety of water bodies and watercourses in areas with various thicknesses of permafrost, within the boreal and subarctic climate zones. Charophyte habitats are mostly associated with the distribution of carbonate rocks. The number of species and their records decrease towards north and east mainly due to shortening of the vegetation period. The highest density of records of charophytes and their most northern records are in river valleys, where the topography and heating effect of the river mitigate the influence of climate and permafrost. This association can be used to model and predict charophyte distribution in periglacial areas during glaciation. Widespread eurytopic species with a flexible life cycle, Chara contraria and C. globularis, are found in valley water bodies due to their ability to withstand environmental variation associated with marked changes in water temperature and flood disturbance. Rare perennial species such as C. strigosa and Tolypella canadensis are represented in deep lakes with less variation in environmental conditions. This paper discusses the distribution, habitat and life history strategies of charophytes that exist in the severe conditions of the permafrost area in Far North-East Asia based on previously published and new data.

中文翻译：

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轮藻（Streptophyta、Charales）如何在远东北亚永久冻土区的恶劣条件下生存

摘要 在远东北亚（即萨哈共和国（雅库特）、马加丹地区和俄罗斯楚科奇自治区）无处不在的多年冻土的广大地区发现了八种轮藻：Chara contraria，C. globularis、C. strigosa、C. virgata、Nitella flexilis、N. opaca、N. wahlbergiana 和 Tolypella canadensis。轮藻在各种水体和水道中发现，这些水体和水道位于具有不同厚度的永久冻土区，位于北方和亚北极气候带内。轮藻栖息地大多与碳酸盐岩的分布有关。物种数量及其记录向北和向东减少，主要是由于植被周期缩短。轮藻的最高密度记录及其最北部的记录在河谷，河流的地形和加热效应减轻了气候和永久冻土的影响。这种关联可用于建模和预测冰期期间冰缘区域的轮藻分布。在山谷水体中发现了具有灵活生命周期的广泛 eurytopic 物种 Chara contraria 和 C. globularis，因为它们能够承受与水温和洪水干扰显着变化相关的环境变化。稀有的多年生物种，如 C. strigosa 和 Tolypella canadensis 存在于环境条件变化较小的深湖中。本文根据先前发表的和新的数据讨论了存在于远东北亚永久冻土区恶劣条件下的轮藻的分布、栖息地和生活史策略。