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Bacterial and archaeal community structure in benthic sediments from glacial lakes at the Múlajökull Glacier, central Iceland
Polar Biology ( IF 1.7 ) Pub Date : 2020-11-10 , DOI: 10.1007/s00300-020-02770-8
Kristaps Lamsters , Monta Ustinova , Līga Birzniece , Ivars Silamiķelis , Julia Gaidelene , Jānis Karušs , Māris Krievāns , Raimonds Kasparinskis , Dāvids Fridmanis , Olga Muter

Glacial lakes and their sediments are highly sensitive temporal markers of environmental variability. The combination of particular geographical conditions with climate changes makes the Mulajokull lakes an appropriate model for revealing some site-specific and common relationships in psychrophilic microbial ecology. The aim of this study was to evaluate the taxonomic and functional diversity of microbial community structures in five glacial lake sediments situated at different distances from the glacier, i.e., 50 m to 1750 m from the ice margin. The Shannon diversity indices varied in the range from 1.99 to 2.94 (with the lowest in C sample) tested by EcoPlates™ and from 1.69 to 1.89 at the phylum level (with the lowest in A sample) tested by the shotgun metagenomic sequencing, respectively. An inter-sample comparison was also conducted. Overall, six bacteria phyla (Proteobacteria, Cyanobacteria, Bacteroidetes, Actinobacteria, Verrucomicrobia and Planctomycetes) and one microalgae phyla (Bacillariophyta) were detected in five lake sediments tested at abundancy that exceeded 1%. Obtained data brings new knowledge related to the cold biosphere on the local and global Earth systems.

中文翻译:

冰岛中部穆拉冰川冰川湖泊底栖沉积物中的细菌和古菌群落结构

冰川湖及其沉积物是环境变化的高度敏感的时间标志。特定地理条件与气候变化的结合使穆拉霍库尔湖成为揭示嗜冷微生物生态学中某些特定地点和共同关系的合适模型。本研究的目的是评估距冰川不同距离(即距冰缘 50 m 至 1750 m)的五个冰川湖沉积物中微生物群落结构的分类学和功能多样性。香农多样性指数分别在 EcoPlates™ 测试的 1.99 至 2.94(C 样本中最低)和鸟枪宏基因组测序测试的门水平(A 样本中最低)的 1.69 至 1.89 范围内变化。还进行了样本间比较。全面的,在检测的 5 个湖泊沉积物中检测到 6 种细菌门(变形菌门、蓝藻门、拟杆菌门、放线菌门、疣微菌门和浮游菌门)和 1 个微藻门(Bacillariophyta),丰度超过 1%。获得的数据为当地和全球地球系统带来了与寒冷生物圈相关的新知识。
更新日期:2020-11-10
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