Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 5, issue 6
Biogeosciences, 5, 1741–1750, 2008
https://doi.org/10.5194/bg-5-1741-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 5, 1741–1750, 2008
https://doi.org/10.5194/bg-5-1741-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  15 Dec 2008

15 Dec 2008

Bacteria in Himalayan glacial ice and its relationship to dust

S. Zhang1,2, S. Hou1, Y. Wu3, and D. Qin1 S. Zhang et al.
  • 1State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • 2Department of life science, Shangqiu Normal University, Shangqiu 476000, China
  • 3School of Life Science, Lanzhou University, Lanzhou 730000, China

Abstract. Concentrations and community diversity of bacteria from 50 segments of a 108.83 m ice core drilled from the East Rongbuk (ER) Glacier (28.03° N, 86.96° E, 6518 m above sea level) on the northeast slope of Mt. Qomolangma (Everest), covering the period 950–1963 AD, were investigated by epifluorescence microscope, DGGE and Shannon-Weaver index analysis. Bacteria in the ER core were identified as β, γ-proteobacteria and Firmicutes group, with γ-proteobacteria being the dominance. Different bacterial population was identified along the core, reflecting the effects of climatic and environmental changes on the bacterial distribution in the glacial ice. There are four general periods of bacterial diversity, corresponding to four phases of dust abundance revealed by Ca2+ concentrations. However, a previously suggested positive correlation between bacterial and Ca2+ concentrations was not indicated by our observations. Instead, a weak negative correlation was found between these two parameters. Our results suggest that bacterial community diversity, rather than concentrations, might be a suitable biological proxy for the reconstruction of past climatic and environmental changes preserved in glacial ice.

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