Inorganic Species Distribution and Microbial Diversity within High Arctic Cryptoendolithic Habitats |
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Authors: | Christopher R Omelon Wayne H Pollard F Grant Ferris |
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Institution: | (1) Microbial Geochemistry Laboratory, Department of Geology, University of Toronto, 22 Russell Street, Toronto, Ontario, M5S-3B1, Canada;(2) Department of Geography, McGill University, 805 Sherbrooke Street West, Montréal, Quebec, H3A-2K6, Canada;(3) Present address: Jackson School of Geosciences, 1 University Station, C-1100, The University of Texas at Austin, Austin, Texas 78712-0254, USA |
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Abstract: | Cryptoendolithic habitats in the Canadian high Arctic are associated with a variety of microbial community assemblages, including
cyanobacteria, algae, and fungi. These habitats were analyzed for the presence of metal ions by sequential extraction and
evaluated for relationships between these and the various microorganisms found at each site using multivariate statistical
methods. Cyanobacteria-dominated communities exist under higher pH conditions with elevated concentrations of calcium and
magnesium, whereas communities dominated by fungi and algae are characterized by lower pH conditions and higher concentrations
of iron, aluminum, and silicon in the overlying surfaces. These results suggest that the activity of the dominant microorganisms
controls the pH of the surrounding environment, which in turn dictates rates of weathering or the possibility for surface
crust formation, both ultimately deciding the structure of microbial diversity for each cryptoendolithic habitat. |
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