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An unexpected role for mixotrophs in the response of peatland carbon cycling to climate warming

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An unexpected role for mixotrophs in the response of peatland carbon cycling to climate warming. / Jassey, Vincent E. J.; Signarbieux, Constant; Haettenschwiler, Stephan et al.
In: Scientific Reports, Vol. 5, 16931, 25.11.2015.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Jassey, VEJ, Signarbieux, C, Haettenschwiler, S, Bragazza, L, Buttler, A, Delarue, F, Fournier, B, Gilbert, D, Laggoun-Defarge, F, Lara, E, Mills, RTE, Mitchell, EAD, Payne, RJ & Robroek, BJM 2015, 'An unexpected role for mixotrophs in the response of peatland carbon cycling to climate warming', Scientific Reports, vol. 5, 16931. https://doi.org/10.1038/srep16931

APA

Jassey, V. E. J., Signarbieux, C., Haettenschwiler, S., Bragazza, L., Buttler, A., Delarue, F., Fournier, B., Gilbert, D., Laggoun-Defarge, F., Lara, E., Mills, R. T. E., Mitchell, E. A. D., Payne, R. J., & Robroek, B. J. M. (2015). An unexpected role for mixotrophs in the response of peatland carbon cycling to climate warming. Scientific Reports, 5, Article 16931. https://doi.org/10.1038/srep16931

Vancouver

Jassey VEJ, Signarbieux C, Haettenschwiler S, Bragazza L, Buttler A, Delarue F et al. An unexpected role for mixotrophs in the response of peatland carbon cycling to climate warming. Scientific Reports. 2015 Nov 25;5:16931. doi: 10.1038/srep16931

Author

Jassey, Vincent E. J. ; Signarbieux, Constant ; Haettenschwiler, Stephan et al. / An unexpected role for mixotrophs in the response of peatland carbon cycling to climate warming. In: Scientific Reports. 2015 ; Vol. 5.

Bibtex

@article{9656baf0224c49cda8018eb8356cfcb1,
title = "An unexpected role for mixotrophs in the response of peatland carbon cycling to climate warming",
abstract = "Mixotrophic protists are increasingly recognized for their significant contribution to carbon (C) cycling. As phototrophs they contribute to photosynthetic C fixation, whilst as predators of decomposers, they indirectly influence organic matter decomposition. Despite these direct and indirect effects on the C cycle, little is known about the responses of peatland mixotrophs to climate change and the potential consequences for the peatland C cycle. With a combination of field and microcosm experiments, we show that mixotrophs in the Sphagnum bryosphere play an important role in modulating peatland C cycle responses to experimental warming. We found that five years of consecutive summer warming with peaks of +2 to +8 degrees C led to a 50% reduction in the biomass of the dominant mixotrophs, the mixotrophic testate amoebae (MTA). The biomass of other microbial groups (including decomposers) did not change, suggesting MTA to be particularly sensitive to temperature. In a microcosm experiment under controlled conditions, we then manipulated the abundance of MTA, and showed that the reported 50% reduction of MTA biomass in the field was linked to a significant reduction of net C uptake (-13%) of the entire Sphagnum bryosphere. Our findings suggest that reduced abundance of MTA with climate warming could lead to reduced peatland C fixation.",
keywords = "TESTATE AMEBAS, SPHAGNUM PEATLAND, PHYTOPLANKTON, EQUATIONS, PROTOZOA, PLANTS",
author = "Jassey, {Vincent E. J.} and Constant Signarbieux and Stephan Haettenschwiler and Luca Bragazza and Alexandre Buttler and Frederic Delarue and Bertrand Fournier and Daniel Gilbert and Fatima Laggoun-Defarge and Enrique Lara and Mills, {Robert T. E.} and Mitchell, {Edward A. D.} and Payne, {Richard J.} and Robroek, {Bjorn J. M.}",
year = "2015",
month = nov,
day = "25",
doi = "10.1038/srep16931",
language = "English",
volume = "5",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",

}

RIS

TY - JOUR

T1 - An unexpected role for mixotrophs in the response of peatland carbon cycling to climate warming

AU - Jassey, Vincent E. J.

AU - Signarbieux, Constant

AU - Haettenschwiler, Stephan

AU - Bragazza, Luca

AU - Buttler, Alexandre

AU - Delarue, Frederic

AU - Fournier, Bertrand

AU - Gilbert, Daniel

AU - Laggoun-Defarge, Fatima

AU - Lara, Enrique

AU - Mills, Robert T. E.

AU - Mitchell, Edward A. D.

AU - Payne, Richard J.

AU - Robroek, Bjorn J. M.

PY - 2015/11/25

Y1 - 2015/11/25

N2 - Mixotrophic protists are increasingly recognized for their significant contribution to carbon (C) cycling. As phototrophs they contribute to photosynthetic C fixation, whilst as predators of decomposers, they indirectly influence organic matter decomposition. Despite these direct and indirect effects on the C cycle, little is known about the responses of peatland mixotrophs to climate change and the potential consequences for the peatland C cycle. With a combination of field and microcosm experiments, we show that mixotrophs in the Sphagnum bryosphere play an important role in modulating peatland C cycle responses to experimental warming. We found that five years of consecutive summer warming with peaks of +2 to +8 degrees C led to a 50% reduction in the biomass of the dominant mixotrophs, the mixotrophic testate amoebae (MTA). The biomass of other microbial groups (including decomposers) did not change, suggesting MTA to be particularly sensitive to temperature. In a microcosm experiment under controlled conditions, we then manipulated the abundance of MTA, and showed that the reported 50% reduction of MTA biomass in the field was linked to a significant reduction of net C uptake (-13%) of the entire Sphagnum bryosphere. Our findings suggest that reduced abundance of MTA with climate warming could lead to reduced peatland C fixation.

AB - Mixotrophic protists are increasingly recognized for their significant contribution to carbon (C) cycling. As phototrophs they contribute to photosynthetic C fixation, whilst as predators of decomposers, they indirectly influence organic matter decomposition. Despite these direct and indirect effects on the C cycle, little is known about the responses of peatland mixotrophs to climate change and the potential consequences for the peatland C cycle. With a combination of field and microcosm experiments, we show that mixotrophs in the Sphagnum bryosphere play an important role in modulating peatland C cycle responses to experimental warming. We found that five years of consecutive summer warming with peaks of +2 to +8 degrees C led to a 50% reduction in the biomass of the dominant mixotrophs, the mixotrophic testate amoebae (MTA). The biomass of other microbial groups (including decomposers) did not change, suggesting MTA to be particularly sensitive to temperature. In a microcosm experiment under controlled conditions, we then manipulated the abundance of MTA, and showed that the reported 50% reduction of MTA biomass in the field was linked to a significant reduction of net C uptake (-13%) of the entire Sphagnum bryosphere. Our findings suggest that reduced abundance of MTA with climate warming could lead to reduced peatland C fixation.

KW - TESTATE AMEBAS

KW - SPHAGNUM PEATLAND

KW - PHYTOPLANKTON

KW - EQUATIONS

KW - PROTOZOA

KW - PLANTS

U2 - 10.1038/srep16931

DO - 10.1038/srep16931

M3 - Journal article

VL - 5

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 16931

ER -