title: Inorganic species distribution and microbial diversity within high Arctic cryptoendolithic habitats.
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.
authors: Department of Geology, University of Toronto, 22 Russell Street, Toronto, Ontario, M5S-3B1, Canada. omelon@mail.utexas.edu
authors: Christopher R
authors: CR
authors: Omelon
authors: Wayne H
authors: WH
authors: Pollard
authors: F Grant
authors: FG
authors: Ferris
mesh_terms: D000535:Aluminum / Q000032:analysis; D001110:Arctic Regions; D044822:Biodiversity; D002118:Calcium / Q000032:analysis; D000458:Cyanobacteria / Q000145:classification / Q000302:isolation & purification*; D017753:Ecosystem; D056890:Eukaryota / Q000145:classification / Q000302:isolation & purification*; D005658:Fungi / Q000145:classification / Q000302:isolation & purification*; D055593:Geological Phenomena; D005844:Geology; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000032:analysis; D008274:Magnesium / Q000032:analysis; D011791:Quartz / Q000737:chemistry*; D012825:Silicon / Q000032:analysis
chemical_list: D011791:Quartz; D000535:Aluminum; D007501:Iron; D008274:Magnesium; D002118:Calcium; D012825:Silicon