Lakes and ponds derived from thawing permafrost are strong emitters of carbon dioxide and methane to the atmosphere, but little is known about the methane oxidation processes in these waters. Here we investigated the distribution and potential activity of aerobic methanotrophic bacteria in thaw ponds in two types of eroding permafrost landscapes in subarctic Québec: peatlands and mineral soils. We hypothesized that methanotrophic community composition and potential activity differ regionally as a function of the landscape type and permafrost degradation stage, and locally as a function of depth-dependent oxygen conditions. Our analysis of pmoA transcripts by Illumina amplicon sequencing and quantitative PCR showed that the communities were composed of diverse and potentially active lineages. Type I methanotrophs, particularly Methylobacter, dominated all communities, however there was a clear taxonomic separation between the two landscape types, consistent with environmental control of community structure. In contrast, methanotrophic potential activity, measured by pmoA transcript concentrations, did not vary with landscape type, but correlated with conductivity, phosphorus and total suspended solids. Methanotrophic potential activity was also detected in low-oxygen bottom waters, where it was inversely correlated with methane concentrations, suggesting methane depletion by methanotrophs. Methanotrophs were present and potentially active throughout the water column regardless of oxygen concentration, and may therefore be resilient to future mixing and oxygenation regimes in the warming subarctic.
Diversity and potential activity of methanotrophs in high methane-emitting permafrost thaw ponds
S. Crevecoeur,W. Vincent,J. Comte,A. Matveev,C. Lovejoy
Published 2017 in PLoS ONE
ABSTRACT
PUBLICATION RECORD
- Publication year
2017
- Venue
PLoS ONE
- Publication date
2017-11-28
- Fields of study
Medicine, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- conductivity
Water electrical conductivity used as an environmental variable.
Aliases: electrical conductivity
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - illumina amplicon sequencing
A high-throughput sequencing approach used to profile pmoA transcript diversity.
Aliases: Illumina sequencing, amplicon sequencing
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - landscape type
The broader thaw-pond setting distinguished as peatland or mineral-soil eroding permafrost landscape.
Aliases: peatland vs mineral-soil landscape, landscape
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - low-oxygen bottom waters
The deepest pond waters sampled under reduced oxygen conditions.
Aliases: bottom waters, low oxygen bottom water
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - methane concentrations
Dissolved methane levels measured in the pond water.
Aliases: CH4 concentrations, methane levels
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - methanotrophic potential activity
An inferred measure of methanotroph activity based on pmoA transcript concentration.
Aliases: potential activity of methanotrophs, methanotroph activity
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - methylobacter
A genus of type I methanotrophic bacteria represented in the pmoA transcript communities.
Aliases: Methylobacter spp.
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - phosphorus
A nutrient concentration variable measured in pond water.
Aliases: P
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - pmoa transcripts
Transcripts of the particulate methane monooxygenase alpha-subunit gene used here as a marker of methanotroph presence and activity.
Aliases: pmoA transcript
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - quantitative pcr
A targeted nucleic-acid quantification method used to estimate pmoA transcript abundance.
Aliases: qPCR
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - total suspended solids
The concentration of suspended particulate matter in the water.
Aliases: TSS
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - type i methanotrophs
A functional group of aerobic methane-oxidizing bacteria within the Gammaproteobacteria.
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review - water column
The vertical span of pond water from surface to bottom.
Aliases: pond water column
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewB (s683577b42) review
REFERENCES
CITED BY
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