Methane oxidation in deep-sea hydrothermal plumes of the endeavour segment of the Juan de Fuca Ridge

Angelis, Marie A. de; Lilley, Marvin D.; Baross, John A.

doi:10.1016/0967-0637(93)90132-m

Cited by 180 publications

(159 citation statements)

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“…Prevalent expression of methane monooxygenases in the Guaymas Basin plume and surrounding waters is consistent with vigorous microbial methane oxidation that has been observed in dispersing hydrothermal plumes (de Angelis et al, 1993;Cowen et al, 2002). Although abundant methanotrophic populations are typically restricted to environments with elevated methane, we observed molecular markers of methanotrophy not only in hydrothermal plumes of Guaymas Basin, but also in background waters above the plume (400 m above the seafloor) and nearly 100 km away from hydrothermal sources, in the Carmen Basin.…”

Section: Discussionsupporting

confidence: 48%

The metatranscriptome of a deep-sea hydrothermal plume is dominated by water column methanotrophs and lithotrophs

et al. 2012

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Microorganisms mediate geochemical processes in deep-sea hydrothermal vent plumes, which are a conduit for transfer of elements and energy from the subsurface to the oceans. Despite this important microbial influence on marine geochemistry, the ecology and activity of microbial communities in hydrothermal plumes is largely unexplored. Here, we use a coordinated metagenomic and metatranscriptomic approach to compare microbial communities in Guaymas Basin hydrothermal plumes to background waters above the plume and in the adjacent Carmen Basin. Despite marked increases in plume total RNA concentrations (3-4 times) and microbially mediated manganese oxidation rates (15-125 times), plume and background metatranscriptomes were dominated by the same groups of methanotrophs and chemolithoautotrophs. Abundant community members of Guaymas Basin seafloor environments (hydrothermal sediments and chimneys) were not prevalent in the plume metatranscriptome. De novo metagenomic assembly was used to reconstruct genomes of abundant populations, including Marine Group I archaea, Methylococcaceae, SAR324 Deltaproteobacteria and SUP05 Gammaproteobacteria. Mapping transcripts to these genomes revealed abundant expression of genes involved in the chemolithotrophic oxidation of ammonia (amo), methane (pmo) and sulfur (sox). Whereas amo and pmo gene transcripts were abundant in both plume and background, transcripts of sox genes for sulfur oxidation from SUP05 groups displayed a 10-20-fold increase in plumes. We conclude that the biogeochemistry of Guaymas Basin hydrothermal plumes is mediated by microorganisms that are derived from seawater rather than from seafloor hydrothermal environments such as chimneys or sediments, and that hydrothermal inputs serve as important electron donors for primary production in the deep Gulf of California.

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Section: Discussionsupporting

confidence: 48%

The metatranscriptome of a deep-sea hydrothermal plume is dominated by water column methanotrophs and lithotrophs

et al. 2012

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“…Although the peak rate constant produced by the model was slightly higher than previously published values (19), this small difference is as expected given the much higher initial methane concentrations in the DWH output (4,7). Notably, a more sophisticated oil-spill model prior to our work (20) incorporated the published rate constant (19) with which our modeled rates agree most closely.…”

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confidence: 46%

Response to Comment on “A Persistent Oxygen Anomaly Reveals the Fate of Spilled Methane in the Deep Gulf of Mexico”

Kessler

Valentine

Redmond

et al. 2011

Science

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We hypothesized that methane from the Deepwater Horizon oil spill was quantitatively consumed and presented results from four tests supporting this finding. Subsequent published studies provide further support for our conclusions. We refute the criticisms by Joye et al., which are incorrect, internally contradictory, based on flow-rate estimates that exceed consensus values, and overall do not disprove our hypothesis or invalidate its underlying assumptions.

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“…Scavenging times for dissolved Mn are typically a few months to a few years, as measured using 54Mn (Cowen et al, 1990;Lavelle et al, 1992;Mandemack and Tebo, 1993). Methane residence times with respect to oxidation are a few days to a few weeks, as measured using 14C (De Angelis et al, 1993) and the ***R&He 'clock' (Kadko et al, 1990). As noted above, the particles recovered from our samples contain very low concentrations of hydrothermal Mn (Feely et al, 1994).…”

Section: Resultsmentioning

confidence: 99%

Manganese and methane in hydrothermal plumes along the East Pacific Rise, 8°40′ to 11°50′N

Mottl

Sansone

Wheat

et al. 1995

Geochimica et Cosmochimica Acta

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Abstract-In November, 1991, we surveyed the water column for hydrothermal plumes along 350 km of the East Pacific Rise axis from 8'40 ' to 1 lo50 ' N, using a combination of physical and chemical measurements. Our survey included the two major ridge segments north and south of the Clipperton Transform Fault at about lO"lO'N, both limbs of the overlapping spreading centers (OSC's) at 9"03 'N and 1 lo45 'N, and a 30&m section of the next ridge segment to the south. We found vigorous plumes along most of this ridge axis, in keeping with its magmatically robust cross-section, axial summit caldera, and shallow, magma-related seismic reflector. These plumes were detectable by both physical (temperature and light attenuation) and chemical (dissolved Mn and CR) measurements, although the chemical measurements were more sensitive. The least active sections were the southern third of the northern segment from lo"20 to 52'N and the OSCs, especially the OSC at ll"45'N. Plumes there had weak Mn and CH4 signals and were barely detectable by physical methods. These axial sections were the only ones surveyed that lie deeper than 2600 m and appear to be magma starved. The most active sections on the northern segment gave stronger signals for Mn and temperature than for CH, and light attenuation, whereas the opposite was true on the southern segment, which was the site of a volcanic eruption at 9"45-52'N only seven months prior to our cruise. On the northern segment the four physical and chemical plume tracers correlated positively and linearly with one another, suggesting that the segment was fed by relatively uniform endmember fluids with a mean C&Nn molar ratio of 0.075. The southernmost section surveyed, from 8"42' to 9'08 'N, closely resembled the northern segment. The rest of the southern segment fell into three sections with different CHJMn ratios: 9"39 to 53'N with CHJMn as high as 10, 9'08 to 39'N with CHJMn of 0.51, and 9"53 ' to lO"07'N with CH,/Mn of 0.85. The section with the highest CHJMn was the site of the volcanic eruption, which produced high-temperature, low-salinity, gas-rich vent fluids carrying abundant bacterial Darticles. The high CH, concentradons are clearly associated with the volcanic eruption, but the origin of the CH, is uncle&.

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Methane oxidation in deep-sea hydrothermal plumes of the endeavour segment of the Juan de Fuca Ridge

Cited by 180 publications

References 27 publications

The metatranscriptome of a deep-sea hydrothermal plume is dominated by water column methanotrophs and lithotrophs

The metatranscriptome of a deep-sea hydrothermal plume is dominated by water column methanotrophs and lithotrophs

Response to Comment on “A Persistent Oxygen Anomaly Reveals the Fate of Spilled Methane in the Deep Gulf of Mexico”

Manganese and methane in hydrothermal plumes along the East Pacific Rise, 8°40′ to 11°50′N

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