Development of bacterial and archaeal communities in erupted subsurface muds at the Håkon Mosby mud volcano

Emission of the greenhouse gas methane from the seabed is globally controlled by marine aerobic and anaerobic methanotrophs gaining energy via methane oxidation. However, the processes involved in the assembly and dynamics of methanotrophic populations in complex natural microbial communities remain unclear. Here we investigated the development of a methanotrophic microbiome following subsurface mud eruptions at Håkon Mosby mud volcano (1250 m water depth). We analyzed surface and subsurface sediment samples across HMMV mud flows from most recently discharged subsurface muds towards old consolidated muds as well as one reference site located approximately 0.5 km outside of the HMMV. Surface sediment samples (0-20 cm) were recovered either by TV-guided Multicorer or by push cores. Subsurface sediments of all zones (>2 m below sea floor) were obtained in by gravity corer. After recovery, sediments were immediately subsampled in a refrigerated container (0°C) and further processed for biogeochemical analyses or preserved at -20°C for later DNA analyses. Our study show that freshly erupted muds hosted deep-subsurface communities, which were dominated by Bathyarchaeota, Atribacteria and Chloroflexi. Methanotrophy was initially limited to a thin surface layer of Methylococcales populations consuming methane aerobically. With increasing distance to the eruptive center, anaerobic methanotrophic archaea, sulfate-reducing Desulfobacterales and thiotrophic Beggiatoaceae developed, and their respective metabolic capabilities dominated the biogeochemical functions of the community. Microbial richness, evenness, and cell numbers of the entire microbial community increased up to tenfold within a few years downstream of the mud flow from the eruptive center. The increasing diversity was accompanied by an up to fourfold increase in sequence abundance of relevant metabolic genes of the anaerobic methanotrophic and thiotrophic guilds. The communities fundamentally changed in their structure and functions as reflected in the metagenome turnover with distance from the eruptive center, and this was reflected in the biogeochemical zonation across the mud volcano caldera. The observed functional succession provides a framework for the response time and recovery of complex methanotrophic communities after disturbances of the deep-sea bed.

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Cite this as

Ruff, S Emil, Felden, Janine, Marcon, Yann, Ramette, Alban, Boetius, Antje (2016). Dataset: Development of bacterial and archaeal communities in erupted subsurface muds at the Håkon Mosby mud volcano. https://doi.org/10.1594/PANGAEA.861266

DOI retrieved: 2016

Additional Info

Field Value
Imported on November 29, 2024
Last update November 29, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.861266
Author Ruff, S Emil
Given Name S Emil
Family Name Ruff
More Authors
Felden, Janine
Marcon, Yann
Ramette, Alban
Boetius, Antje
Source Creation 2016
Publication Year 2016
Resource Type application/zip - filename: Ruff_2016
Subject Areas
Name: Biosphere

Name: Ecology

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