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| Titel |
Bacteria in Himalayan glacial ice and its relationship to dust |
| VerfasserIn |
S. Zhang, S. Hou, Y. Wu, D. Qin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 6 ; Nr. 5, no. 6 (2008-12-15), S.1741-1750 |
| Datensatznummer |
250002938
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| Publikation (Nr.) |
 copernicus.org/bg-5-1741-2008.pdf |
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| Zusammenfassung |
| 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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