Microbial communities from Arctic marine sediments respond slowly to methane addition during ex situ enrichments
Abstract
Summary Anaerobic methanotrophic archaea (ANME) consume methane in marine sediments, limiting its release to the water column, but their responses to changes in methane and sulfate supplies remain poorly constrained. To address how methane exposure may affect microbial communities and methane‐ and sulfur‐cycling gene abundances in Arctic marine sediments, we collected sediments from offshore Svalbard that represent geochemical horizons where anaerobic methanotrophy is expected to be active, previously active, and long‐inactive based on reaction‐transport biogeochemical modelling of porewater sulfate profiles. Sediment slurries were incubated at in situ temperature and pressure with different added methane concentrations. Sediments from an active area of seepage began to reduce sulfate in a methane‐dependent manner within months, preceding increased relative abundances of anaerobic methanotrophs ANME‐1 within communities. In previously active and long‐inactive sediments, sulfur‐cycling Deltaproteobacteria became more dominant after 30 days, though these communities showed no evidence of methanotrophy after nearly 8 months of enrichment. Overall, enrichment conditions, but not methane, broadly altered microbial community structure across different enrichment times and sediment types. These results suggest that active ANME populations may require years to develop, and consequently microbial community composition may affect methanotrophic responses to potential large‐scale seafloor methane releases in ways that provide insight formore »
- Authors:
-
- Oregon State Univ., Corvallis, OR (United States)
- Univ. of California, San Diego, CA (United States). Scripps Inst. of Oceanography
- UiT The Arctic Univ. of Norway, Tromso (Norway)
- Publication Date:
- Research Org.:
- Oregon State Univ., Corvallis, OR (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE); Research Council of Norway (RCN); USDOE
- OSTI Identifier:
- 1799761
- Alternate Identifier(s):
- OSTI ID: 1582474
- Grant/Contract Number:
- FE0013531; 223259; DE‐FE0013531
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Environmental Microbiology
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 5; Journal ID: ISSN 1462-2912
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; methane; AOM; sulfate reduction; marine sediments; Arctic; microbial communities; pressure enrichment
Citation Formats
Klasek, Scott, Torres, Marta E., Bartlett, Douglas H., Tyler, Madeline, Hong, Wei‐Li, and Colwell, Frederick. Microbial communities from Arctic marine sediments respond slowly to methane addition during ex situ enrichments. United States: N. p., 2019.
Web. doi:10.1111/1462-2920.14895.
Klasek, Scott, Torres, Marta E., Bartlett, Douglas H., Tyler, Madeline, Hong, Wei‐Li, & Colwell, Frederick. Microbial communities from Arctic marine sediments respond slowly to methane addition during ex situ enrichments. United States. https://doi.org/10.1111/1462-2920.14895
Klasek, Scott, Torres, Marta E., Bartlett, Douglas H., Tyler, Madeline, Hong, Wei‐Li, and Colwell, Frederick. Sun .
"Microbial communities from Arctic marine sediments respond slowly to methane addition during ex situ enrichments". United States. https://doi.org/10.1111/1462-2920.14895. https://www.osti.gov/servlets/purl/1799761.
@article{osti_1799761,
title = {Microbial communities from Arctic marine sediments respond slowly to methane addition during ex situ enrichments},
author = {Klasek, Scott and Torres, Marta E. and Bartlett, Douglas H. and Tyler, Madeline and Hong, Wei‐Li and Colwell, Frederick},
abstractNote = {Summary Anaerobic methanotrophic archaea (ANME) consume methane in marine sediments, limiting its release to the water column, but their responses to changes in methane and sulfate supplies remain poorly constrained. To address how methane exposure may affect microbial communities and methane‐ and sulfur‐cycling gene abundances in Arctic marine sediments, we collected sediments from offshore Svalbard that represent geochemical horizons where anaerobic methanotrophy is expected to be active, previously active, and long‐inactive based on reaction‐transport biogeochemical modelling of porewater sulfate profiles. Sediment slurries were incubated at in situ temperature and pressure with different added methane concentrations. Sediments from an active area of seepage began to reduce sulfate in a methane‐dependent manner within months, preceding increased relative abundances of anaerobic methanotrophs ANME‐1 within communities. In previously active and long‐inactive sediments, sulfur‐cycling Deltaproteobacteria became more dominant after 30 days, though these communities showed no evidence of methanotrophy after nearly 8 months of enrichment. Overall, enrichment conditions, but not methane, broadly altered microbial community structure across different enrichment times and sediment types. These results suggest that active ANME populations may require years to develop, and consequently microbial community composition may affect methanotrophic responses to potential large‐scale seafloor methane releases in ways that provide insight for future modelling studies.},
doi = {10.1111/1462-2920.14895},
journal = {Environmental Microbiology},
number = 5,
volume = 22,
place = {United States},
year = {Sun Dec 15 00:00:00 EST 2019},
month = {Sun Dec 15 00:00:00 EST 2019}
}
Web of Science
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