Vertical quantitative and dominant population distribution of the bacteria isolated from the Muztagata ice core

本文核心词：muztaga。

Vertical quantitative and dominant population distribution of the bacteria isolated from the Muztagata ice core

Vertical distribution of the main bacteria isolated from the Muztagata ice core (about 22.4 m) was investigated by means of cultivation and 16S rRNA sequence analysis. The results showed that the amount of culturable bacteria fluctuated with ice core depth, and was more in dirty layer than in clean ice, which suggested the close corresponding relationship between high input of the bacteria deposited by wind and snowflow and dirty layer. Most of the bacteria were psychrophiles and psychrotolerants, including α- and γ-proteobacteria, Cryobacterium psychrophilum, CFB (Cytophaga-Flavobacterium-Bacteroides) group, high-G+C gram-positive bacteria (HGC). Acinetobacter sp. And HGC repeatly occurred in different ice depths, and their quantitative distribution was consistent with the change of the total amount of culturable bacteria with depth, which suggested the main bio-indicator; while Flavobacterium, Cryobacterium psychrophilum, and α-proteobacteria, also functioned as a secondary indicator of climatic and environmental changes. This study is the first report concerning continuous quantitative variation and pattern of the main culturable bacteria in ice core section.

作 者：XIANG Shurong YAO Tandong AN Lizhe WU Guangjian XU Baiqing MA Xiaojun LI Zhen WANG Junxia YU Wusheng 作者单位：XIANG Shurong(Key Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou 730000, China)

YAO Tandong(Key Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou 730000, China;Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China)

AN Lizhe(Key Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou 730000, China;College of Life Science, Lanzhou University, Lanzhou 730000, China)

WU Guangjian,XU Baiqing(Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China)

MA Xiaojun(College of Life Science, Lanzhou University, Lanzhou 730000, China)

LI Zhen,WANG Junxia,YU Wusheng(Key Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China)

刊 名：中国科学D辑（英文版） SCI英文刊名：SCIENCE IN CHINA SERIES D (EARTH SCIENCES) 年，卷(期)：2005 48(10) 分类号：P3 关键词：Pamirs Plateau ice core pattern of bacteria bio-indicator

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