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Microbial community composition and endolith colonization at an Arctic thermal spring are driven by calcite precipitation

Environmental Microbiology Reports

By:
, , ,
DOI: 10.1111/1758-2229.12063

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Abstract

Environmental conditions shape community composition. Arctic thermal springs provide an opportunity to study how environmental gradients can impose strong selective pressures on microbial communities and provide a continuum of niche opportunities. We use microscopic and molecular methods to conduct a survey of microbial community composition at Troll Springs on Svalbard, Norway, in the high Arctic. Microorganisms there exist under a wide range of environmental conditions: in warm water as periphyton, in moist granular materials, and in cold, dry rock as endoliths. Troll Springs has two distinct ecosystems, aquatic and terrestrial, together in close proximity, with different underlying environmental factors shaping each microbial community. Periphyton are entrapped during precipitation of calcium carbonate from the spring's waters, providing microbial populations that serve as precursors for the development of endolithic communities. This process differs from most endolith colonization, in which the rock predates the communities that colonize it. Community composition is modulated as environmental conditions change within the springs. At Troll, the aquatic environments show a small number of dominant operational taxonomic units (OTUs) that are specific to each sample. The terrestrial environments show a more even distribution of OTUs common to multiple samples.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Microbial community composition and endolith colonization at an Arctic thermal spring are driven by calcite precipitation
Series title:
Environmental Microbiology Reports
DOI:
10.1111/1758-2229.12063
Volume
5
Issue:
5
Year Published:
2013
Language:
English
Publisher:
Wiley
Contributing office(s):
National Research Program - Eastern Branch
Description:
12 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Microbiology Reports
First page:
648
Last page:
659
Number of Pages:
12
Other Geospatial:
Arctic