Microbial community development on the surface of Hans and Werenskiold Glaciers (Svalbard, Arctic): a comparison.

https://arctichealth.org/en/permalink/ahliterature263930
Source
Extremophiles. 2015 Jun 24;
Publication Type
Article
Date
Jun-24-2015
Author
Jakub Grzesiak
Dorota Górniak
Aleksander Swiatecki
Tamara Aleksandrzak-Piekarczyk
Katarzyna Szatraj
Marek K Zdanowski
Source
Extremophiles. 2015 Jun 24;
Date
Jun-24-2015
Language
English
Publication Type
Article
Abstract
Surface ice and cryoconite holes of two types of polythermal Svalbard Glaciers (Hans Glacier-grounded tidewater glacier and Werenskiold Glacier-land-based valley glacier) were investigated in terms of chemical composition, microbial abundance and diversity. Gathered data served to describe supraglacial habitats and to compare microbe-environment interactions on those different type glaciers. Hans Glacier samples displayed elevated nutrient levels (DOC, nitrogen and seston) compared to Werenskiold Glacier. Adjacent tundra formations, bird nesting sites and marine aerosol were candidates for allochtonic enrichment sources. Microbial numbers were comparable on both glaciers, with surface ice containing cells in the range of 10(4) mL(-1) and cryoconite sediment 10(8) g(-1) dry weight. Denaturating gradient gel electrophoresis band-based clustering revealed differences between glaciers in terms of dominant bacterial taxa structure. Microbial community on Werenskiold Glacier benefited from the snow-released substances. On Hans Glacier, this effect was not as pronounced, affecting mainly the photoautotrophs. Over-fertilization of Hans Glacier surface was proposed as the major factor, desensitizing the microbial community to the snow melt event. Nitrogen emerged as a limiting factor in surface ice habitats, especially to Eukaryotic algae.
PubMed ID
26104673 View in PubMed
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