ArticleApplied and environmental microbiology2008
Estimates of biogenic methane production rates in deep marine sediments at Hydrate Ridge, Cascadia margin.
Article in Applied and environmental microbiology, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.
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23 citing papers in PubMed, 120 citations in OpenAlex.
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- Acetoclastic Methanosaeta are dominant methanogens in organic-rich Antarctic marine sediments.The ISME journal · 2018Article
- Affinity for self antigen selects Treg cells with distinct functional properties.Nature immunology · 2016Article
- Abundant Atribacteria in deep marine sediment from the Adélie Basin, Antarctica.Frontiers in microbiology · 2015Article
- Methyl coenzyme M reductase A (mcrA) gene-based investigation of methanogens in the mudflat sediments of Yangtze River estuary, China.Microbial ecology · 2013Article
- Microbial activity in the marine deep biosphere: progress and prospects.Frontiers in microbiology · 2013Article
- Potential methane reservoirs beneath Antarctica.Nature · 2012Article
- Quantification of Microbial Communities in Subsurface Marine Sediments of the Black Sea and off Namibia.Frontiers in microbiology · 2012Article
- Cultivation of methanogenic community from subseafloor sediments using a continuous-flow bioreactor.The ISME journal · 2011Article
- Carbon and nitrogen assimilation in deep subseafloor microbial cells.Proceedings of the National Academy of Sciences of the United States of America · 2011Article
- Oligonucleotide primers, probes and molecular methods for the environmental monitoring of methanogenic archaea.Microbial biotechnology · 2011Review
- Increment in anaerobic hydrocarbon degradation activity of Halic Bay sediments via nutrient amendment.Microbial ecology · 2011Article
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Authors and funding
6 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Methane hydrate found in marine sediments is thought to contain gigaton quantities of methane and is considered an important potential fuel source and climate-forcing agent. Much of the methane in hydrates is biogenic, so models that predict the presence and distribution of hydrates require accurate rates of in situ methanogenesis. We estimated the in situ methanogenesis rates in Hydrate Ridge (HR) sediments by coupling experimentally derived minimal rates of methanogenesis to methanogen biomass determinations for discrete locations in the sediment column. When starved in a biomass recycle reactor, Methanoculleus submarinus produced ca. 0.017 fmol methane/cell/day. Quantitative PCR (QPCR) directed at the methyl coenzyme M reductase subunit A gene (mcrA) indicated that 75% of the HR sediments analyzed contained <1,000 methanogens/g. The highest numbers of methanogens were found mostly from sediments <10 m below seafloor. By considering methanogenesis rates for starved methanogens (adjusted to account for in situ temperatures) and the numbers of methanogens at selected depths, we derived an upper estimate of <4.25 fmol methane produced/g sediment/day for the samples with fewer methanogens than the QPCR method could detect. The actual rates could vary depending on the real number of methanogens and various seafloor parameters that influence microbial activity. However, our calculated rate is lower than rates previously reported for such sediments and close to the rate derived using geochemical modeling of the sediments. These data will help to improve models that predict microbial gas generation in marine sediments and determine the potential influence of this source of methane on the global carbon cycle.
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