In Central Yakutia (Siberia) livelihoods of local communities depend on alaas (thermokarst depression) landscapes and the lakes within. Development and dynamics of these alaas lakes are closely connected to climate change, permafrost thawing, catchment conditions, and land use. To reconstruct lake development throughout the Holocene we analyze sedimentary ancient DNA (sedaDNA) and biogeochemistry from a sediment core from Lake Satagay, spanning the last c. 10,800 calibrated years before present (cal yrs BP). SedaDNA of diatoms and macrophytes and microfossil diatom analysis reveal lake formation earlier than 10,700 cal yrs BP. The sedaDNA approach detected 42 amplicon sequence variants (ASVs) of diatom taxa, one ASV of Eustigmatophyceae (Nannochloropsis), and 12 ASVs of macrophytes. We relate diatom and macrophyte community changes to climate-driven shifts in water level and mineral and organic input, which result in variable water conductivity, in-lake productivity, and sediment deposition. We detect a higher lake level and water conductivity in the Early Holocene (c. 10,700–7000 cal yrs BP) compared to other periods, supported by the dominance of Stephanodiscus sp. and Stuckenia pectinata. Further climate warming towards the Mid-Holocene (7000–4700 cal yrs BP) led to a shallowing of Lake Satagay, an increase of the submerged macrophyte Ceratophyllum, and a decline of planktonic diatoms. In the Late Holocene (c. 4700 cal yrs BP–present) stable shallow water conditions are confirmed by small fragilarioid and staurosiroid diatoms dominating the lake. Lake Satagay has not yet reached the final stage of alaas development, but satellite imagery shows an intensification of anthropogenic land use, which in combination with future warming will likely result in a rapid desiccation of the lake.

在雅库特中部（西伯利亚），当地社区的生计依赖​​于阿拉斯（热喀斯特洼地）景观和内部的湖泊。这些阿拉斯湖的发展和动态与气候变化、永久冻土融化、流域条件和土地利用密切相关。为了重建整个全新世的湖泊发展，我们分析了萨塔盖湖沉积物核心的沉积古 DNA (sedaDNA) 和生物地球化学，跨越了最后一个世纪。距今 10,800 年的校准值（cal yrs BP）。硅藻和大型植物的 SedaDNA 以及硅藻微化石分析表明，湖泊的形成时间早于 10,700 卡 BP。 sedaDNA 方法检测到了 42 个硅藻类群的扩增子序列变异 (ASV)、1 个大戟藻科 (微绿球藻) 的 ASV 和 12 个大型植物的 ASV。我们将硅藻和大型植物群落的变化与气候驱动的水位以及矿物质和有机输入的变化联系起来，从而导致水电导率、湖内生产力和沉积物沉积的变化。与其他时期相比，我们在全新世早期（距今 10,700-7000 年）检测到更高的湖泊水位和水电导率，这得到了千金藤盘藻（ Stephanodiscus sp.）优势的支持。和梳齿状的Stuckenia。全新世中期（距今 7000-4700 年）气候进一步变暖，导致萨塔盖湖变浅，沉水植物金鱼藻增多，浮游硅藻数量减少。在全新世晚期（距今约 4700 年），湖中主要存在小型脆弱硅藻和星状硅藻，证实了稳定的浅水条件。萨塔盖湖尚未达到阿拉斯发展的最后阶段，但卫星图像显示人为土地利用的加剧，加上未来的变暖可能会导致湖泊迅速干涸。