Niche differentiation of bacterial communities at a millimeter scale in Shark Bay microbial mats

Wong, Hon Lun, Smith, Daniela-Lee, Visscher, Pieter T. and Burns, Brendan P. (2015) Niche differentiation of bacterial communities at a millimeter scale in Shark Bay microbial mats. Scientific Reports, 5 . doi:10.1038/srep15607


Author Wong, Hon Lun
Smith, Daniela-Lee
Visscher, Pieter T.
Burns, Brendan P.
Title Niche differentiation of bacterial communities at a millimeter scale in Shark Bay microbial mats
Journal name Scientific Reports   Check publisher's open access policy
ISSN 2045-2322
Publication date 2015-10-26
Year available 2015
Sub-type Article (original research)
DOI 10.1038/srep15607
Open Access Status DOI
Volume 5
Total pages 17
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Abstract Modern microbial mats can provide key insights into early Earth ecosystems, and Shark Bay, Australia, holds one of the best examples of these systems. Identifying the spatial distribution of microorganisms with mat depth facilitates a greater understanding of specific niches and potentially novel microbial interactions. High throughput sequencing coupled with elemental analyses and biogeochemical measurements of two distinct mat types (smooth and pustular) at a millimeter scale were undertaken in the present study. A total of 8,263,982 16S rRNA gene sequences were obtained, which were affiliated to 58 bacterial and candidate phyla. The surface of both mats were dominated by Cyanobacteria, accompanied with known or putative members of Alphaproteobacteria and Bacteroidetes. The deeper anoxic layers of smooth mats were dominated by Chloroflexi, while Alphaproteobacteria dominated the lower layers of pustular mats. In situ microelectrode measurements revealed smooth mats have a steeper profile of O-2 and H2S concentrations, as well as higher oxygen production, consumption, and sulfate reduction rates. Specific elements (Mo, Mg, Mn, Fe, V, P) could be correlated with specific mat types and putative phylogenetic groups. Models are proposed for these systems suggesting putative surface anoxic niches, differential nitrogen fixing niches, and those coupled with methane metabolism.
Keyword Sulfate-Reducing Bacteria
Modern Marine Stromatolites
Cyanobacterium Microcoleus-Chthonoplastes
Lithified Micritic Laminae
Nitrogen-Fixation Genes
Guerrero Negro
N-2 Fixation
Cooccurrence Patterns
Western-Australia
Sequence Data
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID EAR 1052974
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Institute for Molecular Bioscience - Publications
 
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Created: Mon, 13 Nov 2017, 05:17:24 EST