Decline of activity and shifts in the methanotrophic community structure of an ombrotrophic peat bog after wildfire

Danilova, Olga V.; Belova, Svetlana E.; Kulichevskaya, Irina S.; Dedysh, Svetlana N.

doi:10.1134/s0026261715050045

Cited by 15 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Methane production in the laboratory followed a similar trend to the field study, with highest production in the UB hollows and virtually no production in the burned hollows, again highlighting this reversal of typical peatland CH4 emissions. These results contrast with other studies looking at CH4 emissions post-fire at peatland sites, with both Danilova et al (2015) and Grau-andrés et al (2019) indicating that fire across an ombrotrophic bog could decrease CH4 oxidation due to removal of the methanotrophic community and potentially increase CH4 emissions due to increased graminoid cover. We do not specifically measure CH4 oxidation in this study.…”

Section: Discussioncontrasting

confidence: 89%

“…Despite the increasing pressures from wildfires across northern peatlands, a knowledge gap still persists on CH4 emissions after wildfire, especially in boreal regions. In a study on the impact of wildfire on methanotrophic communities from an ombrotrophic peat bog, Danilova et al (2015) found a reduction in the activity of the methanotrophs in burned sites 7 years post-fire. This reduction following wildfire could therefore lead to a potential increase in CH4 emissions from bog systems.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Wildfire switches the typical understanding of boreal peatland methane emissions

Davidson

Beest

Petrone

et al. 2019

Preprint

View full text Add to dashboard Cite

Abstract. Boreal peatlands represent a globally important store of carbon, and disturbances such as wildfire can have a negative feedback to the climate. Understanding how carbon exchange and greenhouse gas (GHG) dynamics are impacted after a wildfire is important, especially as boreal peatlands may be vulnerable to changes in wildfire regime under a rapidly changing climate. Yet, given this vulnerability, there is very little in the literature on the impact such fires have on methane (CH4) emissions. This study investigated the effect of wildfire on CH4 emissions at a boreal fen near Fort McMurray, AB, Canada, that was partially burned by the Horse River Wildfire in 2016. We measured CH4 emissions and environmental variables (2017&#8211;2018) and CH4 production potential (2018) in two different microform types (hummocks and hollows) across a burn severity gradient (unburned (UB), moderately burned (MB) and severely burned (SB)). Results indicated a switch in the typical understanding of boreal peatland CH4 emissions. For example, emissions were much lower in the MB and SB hollows in both years compared to UB hollows. Interestingly, across the burned sites, hummocks had higher fluxes in 2017 than hollows at the MB and SB sites. We found typically higher emissions at the UB site where the water table was close to the surface. However, at the burned sites, no relationship was found between CH4 emissions and water table, even under similar hydrological conditions. This further strengthens the argument on the overriding influence of fire. There was also significantly higher CH4 production potential from the UB site than the burned sites. The reduction in CH4 emissions and production in the hollows at burned sites highlights the sensitivity of hollows to fire, removing labile organic material for potential methanogenesis. The previously demonstrated resistance of hummocks to fire also results in limited impact to CH4 emissions and likely faster recovery to pre-fire rates. Given the potential initial net cooling effect resulting from a reduction in CH4 emissions, it is important that the radiative effect of all GHG following wildfire across peatlands is taken into account.

show abstract

Section: Discussioncontrasting

confidence: 89%

mentioning

confidence: 99%

Wildfire switches the typical understanding of boreal peatland methane emissions

Davidson

Beest

Petrone

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…Once the moisture level for anaerobic conditions are met, CH4 emissions are dependent on the availability of labile C in peatlands (Couwenberg, 2009). Fire in peatlands are also known to reduce methanotrophic activity (Danilova et al, 2015), further helping the increase in CH4 concentration in the burnt areas. However, it should be noted that CH4 emissions are very low overall, with mean values under 0.1 mg m -2 hr -1 , which is in line with the lower near zero fluxes observed in different oil palm agricultural plantations in the region.…”

Section: Discussionmentioning

confidence: 99%

Oil palm ‘slash-and-burn’ practice increases post-fire greenhouse gas emissions and nutrient concentrations in burnt regions of an agricultural tropical peatland

Dhandapani

Evers

2020

Science of The Total Environment

View full text Add to dashboard Cite

show abstract

“…It belonged to the phylogenetic cluster containing PmoA sequences from gammaproteobacterial methanotrophs and formed a novel, genus-level lineage, which was only distantly related (81-86% amino acid identity) to the PmoA cluster defined by the genera Methylococcus, Methylocaldum and Methylogaea (Figure 2a). Notably, this PmoA lineage included a number of sequences obtained in cultivation-independent studies from various freshwater environments, that is, peatlands, lake sediments, boreal forest and alpine fen soils (Pester et al, 2004;Jaatinen et al, 2005;Bussmann et al, 2006;Danilova and Dedysh, 2014;Cheema et al, 2015;Danilova et al, 2015). This PmoA lineage is also addressed as OSC (Organic Soil Cluster) cluster of uncultivated methanotrophs, which occur predominantly in peatlands and in some upland soils (Knief, 2015).…”

Section: Enrichment Cultures and Purification Attemptsmentioning

confidence: 99%

A new cell morphotype among methane oxidizers: a spiral-shaped obligately microaerophilic methanotroph from northern low-oxygen environments

et al. 2016

View full text Add to dashboard Cite

Although representatives with spiral-shaped cells are described for many functional groups of bacteria, this cell morphotype has never been observed among methanotrophs. Here, we show that spiral-shaped methanotrophic bacteria do exist in nature but elude isolation by conventional approaches due to the preference for growth under micro-oxic conditions. The helical cell shape may enable rapid motility of these bacteria in water-saturated, heterogeneous environments with high microbial biofilm content, therefore offering an advantage of fast cell positioning under desired high methane/low oxygen conditions. The pmoA genes encoding a subunit of particulate methane monooxygenase from these methanotrophs form a new genus-level lineage within the family Methylococcaceae, type Ib methanotrophs. Application of a pmoA-based microarray detected these bacteria in a variety of high-latitude freshwater environments including wetlands and lake sediments. As revealed by the environmental pmoA distribution analysis, type Ib methanotrophs tend to live very near the methane source, where oxygen is scarce. The former perception of type Ib methanotrophs as being typical for thermal habitats appears to be incorrect because only a minor proportion of pmoA sequences from these bacteria originated from environments with elevated temperatures.

show abstract

Decline of activity and shifts in the methanotrophic community structure of an ombrotrophic peat bog after wildfire

Cited by 15 publications

References 16 publications

Wildfire switches the typical understanding of boreal peatland methane emissions

Wildfire switches the typical understanding of boreal peatland methane emissions

Oil palm ‘slash-and-burn’ practice increases post-fire greenhouse gas emissions and nutrient concentrations in burnt regions of an agricultural tropical peatland

A new cell morphotype among methane oxidizers: a spiral-shaped obligately microaerophilic methanotroph from northern low-oxygen environments

Contact Info

Product

Resources

About