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Phylogenetic and functional diversity of microbial communities associated with subsurface sediments of the Sonora Margin, Guaymas Basin

Vigneron, Adrien, Cruaud, Perrine, Roussel, Erwan Georges Philippe, Pignet, Patricia, Caprais, Jean-Claude, Callac, Nolwenn, Ciobanu, Maria-Cristina, Godfroy, Anne, Cragg, Barry A., Parkes, Ronald John, Van Nostrand, Joy D., He, Zhili, Zhou, Jizhong and Toffin, Laurent 2014. Phylogenetic and functional diversity of microbial communities associated with subsurface sediments of the Sonora Margin, Guaymas Basin. PLoS ONE 9 (8) , e104427. 10.1371/journal.pone.0104427

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Abstract

Subsurface sediments of the Sonora Margin (Guaymas Basin), located in proximity of active cold seep sites were explored. The taxonomic and functional diversity of bacterial and archaeal communities were investigated from 1 to 10 meters below the seafloor. Microbial community structure and abundance and distribution of dominant populations were assessed using complementary molecular approaches (Ribosomal Intergenic Spacer Analysis, 16S rRNA libraries and quantitative PCR with an extensive primers set) and correlated to comprehensive geochemical data. Moreover the metabolic potentials and functional traits of the microbial community were also identified using the GeoChip functional gene microarray and metabolic rates. The active microbial community structure in the Sonora Margin sediments was related to deep subsurface ecosystems (Marine Benthic Groups B and D, Miscellaneous Crenarchaeotal Group, Chloroflexi and Candidate divisions) and remained relatively similar throughout the sediment section, despite defined biogeochemical gradients. However, relative abundances of bacterial and archaeal dominant lineages were significantly correlated with organic carbon quantity and origin. Consistently, metabolic pathways for the degradation and assimilation of this organic carbon as well as genetic potentials for the transformation of detrital organic matters, hydrocarbons and recalcitrant substrates were detected, suggesting that chemoorganotrophic microorganisms may dominate the microbial community of the Sonora Margin subsurface sediments.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > Q Science (General)
Publisher: Public Library of Science
ISSN: 1932-6203
Funders: NERC, EU
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 8 July 2014
Last Modified: 12 Jun 2019 02:17
URI: http://orca-mwe.cf.ac.uk/id/eprint/63197

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