Methanotrophs are core members of the diazotroph community in decaying Norway spruce logs

Mäkipää, Raisa; Leppänen, Sanna M.; Muñoz, Sonia Sanz; Smolander, Aino; Tiirola, Marja; Tuomivirta, Tero; Fritze, Hannu

doi:10.1016/j.soilbio.2018.02.012

Cited by 41 publications

(24 citation statements)

References 23 publications

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“…is well known as a symbiotic N‐fixing organism is striking given that decomposition is often nitrogen‐limited (Boddy, 1999; Bebber et al ., 2011). Methanotrophic bacteria can be important members of wood‐decay diazotroph communities (Mäkipää et al ., 2018). In this study, Methyloferula sp ., an obligate methanotroph (Vorobev et al ., 2011), was commonly and frequently found in Amelanchier arborea samples and rarely in other substrates (Supporting Information Table S6, Figs.…”

Section: Discussionmentioning

confidence: 99%

Wood construction more strongly shapes deadwood microbial communities than spatial location over 5 years of decay

Lee

Oberle

Olivas

et al. 2020

Environmental Microbiology

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Summary Diverse communities of fungi and bacteria in deadwood mediate wood decay. While rates of decomposition vary greatly among woody species and spatially distinct habitats, the relative importance of these factors in structuring microbial communities and whether these shift over time remains largely unknown. We characterized fungal and bacterial diversity within pieces of deadwood that experienced 6.3–98.8% mass loss while decaying in common garden ‘rotplots’ in a temperate oak‐hickory forest in the Ozark Highlands, MO, USA. Communities were isolated from 21 woody species that had been decomposing for 1–5 years in spatially distinct habitats at the landscape scale (top and bottom of watersheds) and within stems (top and bottom of stems). Microbial community structure varied more strongly with wood traits than with spatial locations, mirroring the relative role of these factors on decay rates on the same pieces of wood even after 5 years. Co‐occurring fungal and bacterial communities persistently influenced one another independently from their shared environmental conditions. However, the relative influence of wood construction versus spatial locations differed between fungi and bacteria, suggesting that life history characteristics of these clades structure diversity differently across space and time in decomposing wood.

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Section: Discussionmentioning

confidence: 99%

Wood construction more strongly shapes deadwood microbial communities than spatial location over 5 years of decay

Lee

Oberle

Olivas

et al. 2020

Environmental Microbiology

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“…In deadwood, bacteria and archaea may also contribute to pH changes through the two versions of ammonification: (i) N fixation and (ii) anaerobic assimilatory and dissimilatory nitrite reduction to ammonium ( Stein and Klotz, 2016 ). N fixing bacteria ( Hoppe et al, 2014 , 2015 ; Mäkipää et al, 2018 ; Probst et al, 2018 ) and known bacteria involve in dissimilatory nitrite reduction to ammonium (e.g., Clostridium, Klebsiella ) ( Spano et al, 1982 ; Johnston et al, 2016 ) are detected in conifer and broadleaved deadwood logs. Ammonium in deadwood can be then potentially converted to nitrate via nitrification process, hydrogen (H + ) is released, which can decrease wood pH ( Stein and Klotz, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

Determinants of Deadwood-Inhabiting Fungal Communities in Temperate Forests: Molecular Evidence From a Large Scale Deadwood Decomposition Experiment

et al. 2018

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Despite the important role of wood-inhabiting fungi (WIF) in deadwood decomposition, our knowledge of the factors shaping the dynamics of their species richness and community composition is scarce. This is due to limitations regarding the resolution of classical methods used for characterizing WIF communities and to a lack of well-replicated long-term experiments with sufficient numbers of tree species. Here, we used a large scale experiment with logs of 11 tree species at an early stage of decomposition, distributed across three regions of Germany, to identify the factors shaping WIF community composition and Operational Taxonomic Unit (OTU) richness using next generation sequencing. We found that tree species identity was the most significant factor, corresponding to (P < 0.001) and explaining 10% (representing 48% of the explainable variance) of the overall WIF community composition. The next important group of variables were wood-physicochemical properties, of which wood pH was the only factor that consistently corresponded to WIF community composition. For overall WIF richness patterns, we found that approximately 20% of the total variance was explained by wood N content, location, tree species identity and wood density. It is noteworthy that the importance of determinants of WIF community composition and richness appeared to depend greatly on tree species group (broadleaved vs. coniferous) and it differed between the fungal phyla Ascomycota and Basidiomycota.

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“…No clear evidence of the pmoA gene of methanotrophic bacteria was found in the roots and shoots of boreal forest shrubs (Halmeenmäki et al ., ). However, the pmoA gene is abundant in dead wood where methanotrophs appear to contribute to N 2 fixation (Mäkipääa et al ., ). Methanotrophic bacteria were identified in the tanks of epiphytic bromeliads in a Costa Rican lowland forest (Brandt et al ., ).…”

Section: Tree‐produced Ch4mentioning

confidence: 97%

Methane production and emissions in trees and forests

2019

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Forest ecosystem methane (CH 4 ) research has focused on soils, but trees are also important sources and sinks in forest CH 4 budgets. Living and dead trees transport and emit CH 4 produced in soils; living trees and dead wood emit CH 4 produced inside trees by microorganisms; and trees produce CH 4 through an abiotic photochemical process. Here, we review the state of the science on the production, consumption, transport, and emission of CH 4 by living and dead trees, and the spatial and temporal dynamics of these processes across hydrologic gradients inclusive of wetland and upland ecosystems. Emerging research demonstrates that tree CH 4 emissions can significantly increase the source strength of wetland forests, and modestly decrease the sink strength of upland forests. Scaling from stem or leaf measurements to trees or forests is limited by knowledge of the mechanisms by which trees transport soil-produced CH 4 , microbial processes produce and oxidize CH 4 inside trees, a lack of mechanistic models, the diffuse nature of forest CH 4 fluxes, complex overlap between sources and sinks, and extreme variation across individuals. Understanding the complex processes that regulate CH 4 source-sink dynamics in trees and forests requires cross-disciplinary research and new conceptual models that transcend the traditional binary classification of wetland vs upland forest.

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Methanotrophs are core members of the diazotroph community in decaying Norway spruce logs

Cited by 41 publications

References 23 publications

Wood construction more strongly shapes deadwood microbial communities than spatial location over 5 years of decay

Wood construction more strongly shapes deadwood microbial communities than spatial location over 5 years of decay

Determinants of Deadwood-Inhabiting Fungal Communities in Temperate Forests: Molecular Evidence From a Large Scale Deadwood Decomposition Experiment

Methane production and emissions in trees and forests

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