Three events of Saharan dust deposition on the Mont Blanc glacier associated with different snow-colonizing bacterial phylotypes |
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Authors: | M S Chuvochina I A Alekhina P Normand J -R Petit S A Bulat |
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Institution: | 1.St. Petersburg Nuclear Physics Institute,Russian Academy of Sciences,Gatchina,Russia;2.Division of Molecular and Radiation Biophysics, Laboratory of Glaciology and Geophysics,CNRS,Saint Martin, d’Héres Cedex Grenoble,France;3.Division of Microbial Ecology,Lyon University 1, Lyon,Villeurbanne cedex,France |
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Abstract: | A preliminary study has demonstrated that the structure and species composition of microbial communities associated with events
of dust deposition from the Sahara Desert to the Mont Blanc glacier varied considerably between samples originating from different
time periods. Even for depositions within a single month, the dominant microbial phylotypes and candidates to colonize the
snow pack were different. It is therefore highly probable that the structure and species composition of microbial communities
will be different between any events of the kind. Apparently, the phenomenon does not correlate with the time the dust stays
in the snow cover and consequently with the probable development of microorganisms in situ (three months, one month, and one
week). The reasons for the variation may be the differences in conditions in the epicenter of a specific North African dust
storm, as well as the history of the dust transport in the atmosphere. The candidates for joining the snow biome of Mont Blanc
turned out to be different for three dust events (DEs) and belong to different, mostly minor, phylotypes related to Crossiella cryophilus (Actinobacteria), Devosia limi (α-Proteobacteria), Deinococcus claudionis Deinococcus-Thermus), Anabaena sp. (Cyanobacteria), and Hymenobacter soli (Bacteroidetes). Since all these phylotypes have been previously isolated from soil samples of the Antarctic and Arctic, Arctic snow and
ice, and the Alpine belt soils and sedimentary rocks of the glacier bed, they were tentatively ascribed to the group of snow
pack colonizers. |
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