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| Titel |
Culturable bacteria in Himalayan glacial ice in response to atmospheric circulation |
| VerfasserIn |
S. Zhang, S. Hou, X. Ma, D. Qin, T. Chen |
| 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 ; 4, no. 1 ; Nr. 4, no. 1 (2007-01-10), S.1-9 |
| Datensatznummer |
250001494
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| Publikation (Nr.) |
 copernicus.org/bg-4-1-2007.pdf |
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| Zusammenfassung |
| Only recently has specific attention been given to culturable bacteria in
Tibetan glaciers, but their relation to atmospheric circulation is less
understood yet. Here we present the results of culturable bacteria preserved
in an ice core drilled from the East Rongbuk (ER) glacier, Himalayas. The
average concentrations of culturable bacteria are 5.0, 0.8, 0.1 and 0.7 CFU
mL−1 for the glacier ice deposited during the premonsoon, monsoon,
postmonsoon and winter seasons, respectively. The high concentration of
culturable bacteria in ER glacier deposited during the premonsoon season is
attributed to the transportation of continental dust stirred up by the
frequent dust storms during spring. This is also confirmed by the spatial
distribution of culturable bacteria in Tibetan glaciers. Continental dust
originated from the Northwest China accounts for the high abundance of
culturable bacteria in the northern Tibetan Plateau, while monsoon moisture
exerts great influence on culturable bacteria with low abundance in the
southern plateau. The numbers of representatives with different ARDRA
patterns from RFLP analysis are 10, 15, 1 and 2 for the glacial ice
deposited during the premonsoon, monsoon, postmonsoon and winter seasons,
respectively, suggesting that culturable bacteria deposited in ER glacier
during monsoon season are more diverse than that deposited during the other
seasons, possibly due to their derivation from both marine air masses and
local or regional continental sources, while culturable bacteria deposited
during the other seasons are from only one possible origin that is
transported by westerlies. Our results show the first report of seasonal
variations of abundance and species diversity of culturable bacteria
recovered from glacial ice in the Himalayas, and we suggest that
microorganisms in Himalayan ice might provide a potential new proxy for the
reconstruction of atmospheric circulation. |
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