Asynchronous responses of aquatic ecosystems to hydroclimatic forcing on the Tibetan Plateau
Asynchronous responses of aquatic ecosystems to hydroclimatic forcing on the Tibetan Plateau
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DOI：
10.1038/s43247-021-00325-1
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发表时间：
2022-01
影响因子：
7.9
通讯作者：
Bernhard Aichner;B. Wünnemann;Alice Callegaro;M. V. D. van der Meer;D. Yan;Yongzhan Zhang;C. Barbante;D. Sachse
中科院分区：
文献类型：
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作者：
Bernhard Aichner;B. Wünnemann;Alice Callegaro;M. V. D. van der Meer;D. Yan;Yongzhan Zhang;C. Barbante;D. Sachse
高海拔生态系统对水文气候触发因素反应敏感。在这里，我们评估了生态和水文变化的冰川影响的湖泊（哈拉湖，中国）自末次冰期以来。水生生物标志物的浓度，比率和氢同位素值的快速波动，从15至14,000年和8至5000年前，提供了证据水生政权的转变和湖泊水文变化。相比之下，大多数地球生物标志物的负氢同位素值是在距今9到7,000年之间观察到的。这表明，在所研究的湖泊生态系统变化背后的蒸汽源和降水量增加的变化是不相关的驱动程序。相反，冰川消退和增加的融水排放，由更高的温度驱动，造成了明显的生态反应。晚冰期和全新世中期浮游植物群落的变化说明了类似生态系统对气候和水文变化的脆弱性。这与评估未来对全球变暖的生态反应有关。
High-altitude ecosystems react sensitively to hydroclimatic triggers. Here we evaluated the ecological and hydrological changes in a glacier-influenced lake (Hala Hu, China) since the last glacial. Rapid fluctuations of aquatic biomarker concentrations, ratios, and hydrogen isotope values, from 15 to 14,000 and 8 to 5000 years before present, provided evidence for aquatic regime shifts and changes in lake hydrology. In contrast, most negative hydrogen isotope values of terrestrial biomarkers were observed between 9 and 7,000 years before present. This shows that shifts of vapour sources and increased precipitation amounts were not relevant drivers behind ecosystem changes in the studied lake. Instead, receding glaciers and increased meltwater discharge, driven by higher temperatures, caused the pronounced ecological responses. The shifts within phytoplankton communities in the Late Glacial and mid Holocene illustrate the vulnerability of comparable ecosystems to climatic and hydrological changes. This is relevant to assess future ecological responses to global warming.