ECOLAB > Pages profils > JASSEY Vincent

Profil de Vincent JASSEY

Picture taken during field work in Poland (Climpeat project)

Email :

Téléphone / phone: +33 5 61 55 89 23

Bureau / office : 341

Institution : CNRS

Statut / status: Chercheur

Adresse professionnelle / address:

Université Toulouse III – Paul Sabatier
Bât. 4R1 / Office 341
118 route de Narbonne
F-31062 Toulouse cedex 09

Site perso / personal website :


01/2017 – current: Researcher at The National Center for Scientific Research (CNRS)- Functional Ecology and Environment laboratory (EcoLab), University of Paul Sabatier III, Toulouse (France)

01/2015 – 12/2016: Post-Doctoral position at the Swiss Federal Institute for Forest, Snow and Landscape (WSL) in the Research Unit Community Ecology (Site Lausanne, ECOS group led by Prof. A. Buttler, Switzerland). SNF grant / SPHAGNOL project. PI: Prof. Luca Bragazza.

04/2012 – 12/2014: Post-Doctoral position at the Swiss Federal Institute for Forest, Snow and Landscape WSL in the Research Unit Community Ecology (Site Lausanne, ECOS group led by Prof. A. Buttler, Switzerland) and Adam Mickiewicz University of Poznan (Poland). Swiss Contribution/Polish-Swiss Research grant; CLIMPEAT project. PI: Prof. Mariusz Lamentowicz.

12/2011 – 03/2012: Post-Doctoral position at Chrono-Environnement Laboratory (Montbéliard, France). Supervised by Prof. Nadine Bernard

10/2011 – 11/2012Post-Doctoral position at Soil Biology Laboratory (Neuchâtel, Switzerland). Supervised by Prof. Edward Mitchell.


10/2008-11/2011: Ph.D. at Chrono-Environnement Laboratory (Montbéliard, France). Supervised by Prof. Daniel Gilbert, Dr. Geneviève Chiapusio and Dr. Philippe Binet. Awarded with the highest honours.

I am a community ecologist studying trophic interactions. My research aims at understanding the structure and function of ecological networks, and how these networks matter for ecosystem functioning and services. Particularly, I’m interested at understanding the response of ecological networks to climate change, and how these changes play out in ecosystem functioning.


Plant-plant, plant-soil and plant-microbe interactions play a fundamental role in  community structure and dynamics and in ecosystem functioning. In my research, I aim at understanding how these interactions modify or improve the functioning of ecosystems. Recently, I focused my research on the role of plant secondary metabolites in driving soil microbial food web structure and functioning. In addition, I am interested in determining the role of plant diversity and cover on soil food web and ecosystem functions such as productivity, decomposition, and nutrient cycling. Finally, I aim to develop more research on trophic interactions within food webs, especially concerning the role of mixotrophic organisms -organisms that mix up their role in food webs as either autotrophs or heterotrophs.


Climate is one of the major drivers of  species distributions and interactions in ecosystems. However, climate changes are are expected to shift species distributions or modify their abundance and dominance patterns, generating novel communities composed of new combinations of species. These changes are likely to perturb ecosystem functioning. My research aims at understanding what makes plant and microbial communities resilient to external changes, and what makes them fragile. In my previous work in peatlands, I highlighted the importance of extreme warming events in shifting plant-plant, plant-soil and microbe-microbe interactions. Moreover, I am also interested in exploring the relative importance of the different components of climate change (e.g. warming, flooding, drought etc.) and in showing how these factors together drive ecosystem functions. Ecological communities and species interactions respond to changing climate in different way; some of them unexpectedly break down (losses of species and functions) rapidly while others resist longer to perturbations. I am developing research aiming at understanding the response of ecosystems to climate changes and trying to identify tipping points which could explain the difference in response of communities to extreme climatic events.

Grants awarded

2019-2020: Centre for the Study of Biodiversity in Amazonia (CEBA: ANR-10-LABX-25-01)

Effects of simulated nitrogen deposition on the epiphytic BRYOsphere in a TROPical rainforest (BRYOTROP) | Funded by Centre for the Study of Biodiversity in Amazonia (CEBA:ANR-10-LABX-25-01).

2018-2021: French Agency for Research (ANR-2017-CE01-007) - Young researcher grant (ANR-JCJC): 

Rethinking the peatland carbon cycle - identifying the role of mixotrophs in the biological carbon pump / Repenser le cycle du carbone des tourbières : identifier le rôle des protistes mixotrophes dans la pompe à carbone biologique - 313k€. Principal Investigator

2015 – 2016Swiss National Science Foundation project funding grant: Allelochemical arms race in peatlands; the role of polyphenols in aboveground-belowground interactions (Sphagnol) - 220k€. Co-Principal Investigator

Main/Recent publications

Recent publications 

Jassey, V. E. J., & Signarbieux, C. (2019). Effects of climate warming on Sphagnumphotosynthesis in peatlands depend on peat moisture and species‐specific anatomical traits. Global Change Biology, 182, 65–12.


Hamard, S., Robroek, B. J. M., Allard, P.-M., Signarbieux, C., Zhou, S., Saesong, T., Seasong, T., De Baaker, F., Buttler, A., Chiapusio, G., Wolfender J-L.,

Bragazza, L., Jassey, V.E.J. (2019). Effects of Sphagnum Leachate on Competitive Sphagnum Microbiome Depend on Species and Time. Frontiers in Microbiology, 10, 3317.

Bragazza, L., Robroek, B. J. M., Jassey, V. E. J., Arif, M. S., Marchesini, R., Guglielmin, M., & Cannone, N. (2019). Soil microbial community structure and enzymatic activity along a plant cover gradient in Victoria Land (continental Antarctica). Geoderma, 353, 144–151.

Lamentowicz, M., Gałka, M., Marcisz, K., Słowiński, M., Kajukało-Drygalska, K., Dayras, M. D., & Jassey, V. E. J. (2019).  Unveiling tipping points in long-term ecological records from Sphagnum-dominated peatlands. Biology Letters, 15(4), 20190043–7.

Puissant, J., Jassey, V. E. J., Mills, R. T. E., Robroek, B. J. M., Gavazov, K., De Danieli, S., et al. (2018).  Seasonality alters drivers of soil enzyme activity in subalpine grassland soil undergoing climate change. Soil Biology and Biochemistry. 124, 266-274

Monteux, S., Weedon, J. T., Blume-Werry, G., Gavazov, K., Jassey, V. E. J., Johansson, M., et al. (2018).  Long-term in situ permafrost thaw effects on bacterial communities and potential aerobic respiration. The ISME Journal, 12, 2129-2141.

Chiapusio, G., Jassey, V. E. J., Bellvert, F., Comte, G., Weston, L. A., Delarue, F., et al. (2018).  Sphagnumspecies modulate their phenolic profiles and mycorrhizal colonization of surrounding Andromeda polifolia along peatland Microhabitats. Journal of Chemical Ecology, 27(1–44), 1–12.

Reczuga M.K., Lamentowicz M., Mulot M., Mitchell E.A.D., Buttler A., Chojnicki B.H., Słowiński, M., Binet P., Chiapusio C., Gilbert D., Słowińska, S., Jassey, V.E.J. (2018)  Predator–prey mass ratio drives microbial activity under dry conditions in Sphagnum peatlands. Ecology & Evolution. 2018;00:1–13.

Sanginés de Carcer, P., Vitasse, Y., Peñuleas, J., Jassey, V.E.J., Buttler, A., Signarbieux, C. (in press). Vapor-pressure deficit and extreme climatic variables limit tree growth.  Global Change Biology, xx, xx-xx.

Robroek, B. J. M.*Jassey, V. E. J.*, Payne, R. J., Martí, M., Bragazza, L., Bleeker, A., et al. (2017).  Taxonomic and functional turnover are decoupled in European peat bogs. Nature Communications, 8, 1161.

Jassey, V.E.J.Reczuga, M.K., Zielińska, M., Słowińska, S., Robroek, B.J.M., Mariotte, P., Seppey, C.V.W., Lara, E., Barabach, J., Słowiński, M., Bragazza, L., Chojnicki, B. H., Lamentowicz, M., Mitchell, E.A.D., Buttler, A. (in press).  Tipping point effect in plant-fungal interactions under severe drought causes abrupt rise in peatland ecosystem respiration. Global Change Biology, xx, xx-xx.

Robroek, J.M., Jassey, V.E.J., Beltman, B., Hefting, M.M., (2017).  Diverse fen plant communities enhance carbon-related multifunctionality, but do not mitigate negative effects of drought. Royal Society Open Science, 4, 170449.

Gay-des-Combes, J. M., Sanz Carrillo, C., Robroek, B. J. M., Jassey, V. E. J., Mills, R. T. E., Arif, M. S., et al. (2017).  Tropical soils degraded by slash-and-burn cultivation can be recultivated when amended with ashes and compost. Ecology and Evolution, 60 (Part B), 157–11.

Küttim, M., Hofsommer, M. L., Robroek, B. J. M., Signarbieux, C., Jassey, V. E. J., Laine, A., et al. (2017).  Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration. Boreal Environment Research, 22, 267–276.

Geisen, S., Mitchell, E., Wilkinson, D. M., Adl, S., Bonkowski, M., Brown, M. W., et al. (2017).  Soil protistology rebooted: 30 fundamental questions to start with. Soil Biology and Biochemistry, (111), 94–103.

Binet, P., Rouifed, S., Jassey, V. E. J., Toussaint, M.-L., & Chiapusio, G. (2017).  Experimental climate warming alters the relationship between fungal root symbiosis and Sphagnum litter phenolics in two peatland microhabitats. Soil Biology and Biochemistry, 105(C), 153–161.

Gałka, M., Tobolski, K., Lamentowicz, Ł., Ersek, V., Jassey, V. E. J., van der Knaap, W. O., & Lamentowicz, M. (2017).  Unveiling exceptional Baltic bog ecohydrology, autogenic succession and climate change during the last 2000 years in CE Europe using replicate cores, multi-proxy data and functional traits of testate amoebae. Quaternary Science Reviews, 156, 90–106.

Bragazza, L., Buttler, A., Robroek, B. J. M., Albrecht, R., Zaccone, C., Jassey, V. E. J., & Signarbieux, C. (2017).  Response to Editor to the comment by Delarue (2016) to our paper entitled “Persistent high temperature and low precipitation reduce peat carbon accumulation”. Global Change Biology, (in press).


Current Projects 

full description of my current projects:

Rethinking the peatland carbon cycle – identifying the role of mixotrophs in the biological carbon pump (MIXOPEAT) | Funded by the French Agency for Research (ANR-17-CE01-0007).

Effects of simulated nitrogen deposition on the epiphytic BRYOsphere in a TROPical rainforest (BRYOTROP) | Funded by Centre for the Study of Biodiversity in Amazonia (CEBA:ANR-10-LABX-25-01).

Allelochemical arms race in peatlands: the role of polyphenols in aboveground-belowground interactions (SPHAGNOL)

Influence of global warming and drought on carbon sequestration and biodiversity of Sphagnum peatlands – present, past and future perspectives (CLIMPEAT)

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