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Methane-Oxidizing Bacteria Shunt Carbon to Microbial Mats at a Marine Hydrocarbon Seep

Journal Article · · Frontiers in Microbiology
 [1];  [2];  [3];  [4];  [5];  [6];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Ocean Univ. of China, Qingdao (China)
  3. Univ. of California, Santa Barbara, CA (United States); Case Western Reserve Univ., Cleveland, OH (United States)
  4. Univ. of California, Santa Barbara, CA (United States); Carl von Ossietzky Univ., Wilhelmshaven (Germany)
  5. Univ. of California, Santa Barbara, CA (United States); Univ. of North Carolina, Charlotte, NC (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
The marine subsurface is a reservoir of the greenhouse gas methane. While microorganisms living in water column and seafloor ecosystems are known to be a major sink limiting net methane transport from the marine subsurface to the atmosphere, few studies have assessed the flow of methane-derived carbon through the benthic mat communities that line the seafloor on the continental shelf where methane is emitted. We analyzed the abundance and isotope composition of fatty acids in microbial mats grown in the shallow Coal Oil Point seep field off Santa Barbara, CA, USA, where seep gas is a mixture of methane and CO2. We further used stable isotope probing (SIP) to track methane incorporation into mat biomass. We found evidence that multiple allochthonous substrates supported the rich growth of these mats, with notable contributions from bacterial methanotrophs and sulfur-oxidizers as well as eukaryotic phototrophs. Fatty acids characteristic of methanotrophs were shown to be abundant and 13C-enriched in SIP samples, and DNA-SIP identified members of the methanotrophic family Methylococcaceae as major 13CH4 consumers. Members of Sulfuricurvaceae, Sulfurospirillaceae, and Sulfurovumaceae are implicated in fixation of seep CO2. The mats’ autotrophs support a diverse assemblage of co-occurring bacteria and protozoa, with Methylophaga as key consumers of methane-derived organic matter. This study identifies the taxa contributing to the flow of seep-derived carbon through microbial mat biomass, revealing the bacterial and eukaryotic diversity of these remarkable ecosystems.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1379742
Journal Information:
Frontiers in Microbiology, Journal Name: Frontiers in Microbiology Journal Issue: FEB Vol. 8; ISSN 1664-302X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Microbial megacities fueled by methane oxidation in a mineral spring cave journal September 2017
In situ development of a methanotrophic microbiome in deep-sea sediments journal August 2018
Possible cross-feeding pathway of facultative methylotroph Methyloceanibacter caenitepidi Gela4 on methanotroph Methylocaldum marinum S8 journal March 2019
Communal metabolism by Methylococcaceae and Methylophilaceae is driving rapid aerobic methane oxidation in sediments of a shallow seep near Elba, Italy journal July 2019
Novel facultative Methylocella strains are active methane consumers at terrestrial natural gas seeps journal October 2019

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