1893 / 2019-08-30 14:37:43
Bacterial community changes in a glacial-fed Tibetan lake are correlated with glacial melting
摘要待审
Climate change-induced glacial melting is a global phenomenon. The effects of climate change-induced melting on the microbial ecology in different glacial-fed aquatic systems have been well illuminated, but the resolution of seasonal dynamics was still limited. Here, we studied bacterial community composition and diversity in a glacial-fed Tibetan lake, Lake Ranwu, to elucidate how glacial-fed aquatic ecosystems respond to the seasonal glacial melting. Obvious seasonal variations of bacterial dominant groups were found in Lake Ranwu and inlet rivers. In April, the majority of OTUs belonged to the Bacteroidetes, Actinobacteria and Proteobacteria. The Proteobacteria increased to the most abundant phylum in July and November, while the Bacteroidetes and Actinobacteria decreased about 50% over seasons. Most key discriminant taxa of each season's community strongly associated with specific environmental variables, suggesting their adaptation to seasonal environments. Bacterial alpha diversity varied among seasons and exhibited strongly negative correlations with conductivity. Conductivity was the major driving force in determining the seasonal variation of bacterial community composition. Fluctuated conductivity was one of the consequences of seasonal melting of glaciers. This study offered evidence for the unique seasonal dynamics pattern of bacterial communities responding to glacial melting. Moreover, this study may provide a reference for assessing the long-term effects of glacial retreat on glacial-fed aquatic ecosystems.
Key words: Glacial melting; Seasonal dynamics; Bacterial communities; Glacial-fed; Tibetan lake
重要日期
  • 会议日期

    10月12日

    2019

    10月15日

    2019

  • 09月30日 2019

    初稿截稿日期

  • 10月15日 2019

    注册截止日期

  • 07月21日 2020

    报告提交截止日期

主办单位
青年地学论坛理事会
承办单位
中国科学院青海盐湖研究所
中国科学院西北高原生物研究所
青海师范大学
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