Search results for: Vincent E. J. Jassey

Items from 1 to 20 out of 28 results

article

Development of a digital droplet PCR approach for the quantification of soil micro‐organisms involved in atmospheric CO₂ fixation

Marie Le Geay, Kyle Mayers, Martin Küttim, Béatrice Lauga, more

Environmental Microbiology > 26 > 6 > n/a - n/a

Carbon‐fixing micro‐organisms (CFMs) play a pivotal role in soil carbon cycling, contributing to carbon uptake and sequestration through various metabolic pathways. Despite their importance, accurately quantifying the absolute abundance of these micro‐organisms in soils has been challenging. This study used a digital droplet polymerase chain reaction (ddPCR) approach to measure the abundance of key...

article

Ericoid shrub encroachment shifts aboveground–belowground linkages in three peatlands across Europe and Western Siberia

Alexandre Buttler, Luca Bragazza, Fatima Laggoun‐Défarge, Sebastien Gogo, more

Global Change Biology > 29 > 23 > 6772 - 6793

In northern peatlands, reduction of Sphagnum dominance in favour of vascular vegetation is likely to influence biogeochemical processes. Such vegetation changes occur as the water table lowers and temperatures rise. To test which of these factors has a significant influence on peatland vegetation, we conducted a 3‐year manipulative field experiment in Linje mire (northern Poland). We manipulated the...

article

Linkages between Sphagnum metabolites and peatland CO₂ uptake are sensitive to seasonality in warming trends

Anna Sytiuk, Samuel Hamard, Régis Céréghino, Ellen Dorrepaal, more

New Phytologist > 237 > 4 > 1164 - 1178

Plants produce a wide diversity of metabolites. Yet, our understanding of how shifts in plant metabolites as a response to climate change feedback on ecosystem processes remains scarce. Here, we test to what extent climate warming shifts the seasonality of metabolites produced by Sphagnum mosses, and what are the consequences of these shifts for peatland C uptake. We used a reciprocal transplant...

article

Biochemical traits enhance the trait concept in Sphagnum ecology

Anna Sytiuk, Regis Céréghino, Samuel Hamard, Frédéric Delarue, more

Oikos > 2022 > 4 > n/a - n/a

Sphagnum mosses are key to northern peatland carbon sequestration. They have a range of morphological and anatomical characteristics that allow them to cope with environmental stress. Sphagnum also produces a plethora of biochemicals that may prevent stress‐induced cell‐damage. However, the linkages between Sphagnum anatomical, morphological and biochemical traits (i.e. metabolites, pigments and antioxidant...

article

Contribution of soil algae to the global carbon cycle

Vincent E. J. Jassey, Romain Walcker, Paul Kardol, Stefan Geisen, more

New Phytologist > 234 > 1 > 64 - 76

Soil photoautotrophic prokaryotes and micro‐eukaryotes – known as soil algae – are, together with heterotrophic microorganisms, a constitutive part of the microbiome in surface soils. Similar to plants, they fix atmospheric carbon (C) through photosynthesis for their own growth, yet their contribution to global and regional biogeochemical C cycling still remains quantitatively elusive. Here, we...

article

Functional Traits 2.0: The power of the metabolome for ecology

Tom W. N. Walker, Jake M. Alexander, Pierre‐Marie Allard, Oliver Baines, more

Journal of Ecology > 110 > 1 > 4 - 20

A major aim of ecology is to upscale attributes of individuals to understand processes at population, community and ecosystem scales. Such attributes are typically described using functional traits, that is, standardised characteristics that impact fitness via effects on survival, growth and/or reproduction. However, commonly used functional traits (e.g. wood density, SLA) are becoming increasingly...

article

Predicting the structure and functions of peatland microbial communities from Sphagnum phylogeny, anatomical and morphological traits and metabolites

Anna Sytiuk, Régis Céréghino, Samuel Hamard, Frédéric Delarue, more

Journal of Ecology > 110 > 1 > 80 - 96

Sphagnum mosses are keystone species in northern peatlands. Notably, they play an important role in peatland carbon (C) cycling by regulating the composition and activity of microbial communities. However, it remains unclear whether information on Sphagnum phylogeny and/or traits‐based composition (i.e. anatomical and morphological traits and metabolites) can be used to predict the structure of...

article

Peatland microhabitat heterogeneity drives phototrophic microbe distribution and photosynthetic activity

Samuel Hamard, Martin Küttim, Regis Céréghino, Vincent E. J. Jassey

Environmental Microbiology > 23 > 11 > 6811 - 6827

Phototrophic microbes are widespread in soils, but their contribution to soil carbon (C) uptake remains underexplored in most terrestrial systems, including C‐accreting systems such as peatlands. Here, by means of metabarcoding and ecophysiological measurements, we examined how microbial photosynthesis and its biotic (e.g., phototrophic community structure, biomass) and abiotic drivers (e.g., Sphagnum...

article

Contribution of microbial photosynthesis to peatland carbon uptake along a latitudinal gradient

Samuel Hamard, Regis Céréghino, Maialen Barret, Anna Sytiuk, more

Journal of Ecology > 109 > 9 > 3424 - 3441

Phototrophic microbes, also known as micro‐algae, display a high abundance in many terrestrial surface soils. They contribute to atmospheric carbon dioxide fluxes through their photosynthesis, and thus regulate climate similar to plants. However, microbial photosynthesis remains overlooked in most terrestrial ecosystems. Here, we hypothesise that phototrophic microbes significantly contribute to...

article

In situ resistance, not immigration, supports invertebrate community resilience to drought intensification in a Neotropical ecosystem

Camille Bonhomme, Régis Céréghino, Jean‐François Carrias, Arthur Compin, more

Journal of Animal Ecology > 90 > 9 > 2015 - 2026

While future climate scenarios predict declines in precipitations in many regions of the world, little is known of the mechanisms underlying community resilience to prolonged dry seasons, especially in ‘naïve’ Neotropical rainforests. Predictions of community resilience to intensifying drought are complicated by the fact that the underlying mechanisms are mediated by species' tolerance and resistance...

article

Constraints on potential enzyme activities in thermokarst bogs: Implications for the carbon balance of peatlands following thaw

Liam Heffernan, Vincent E. J. Jassey, Maya Frederickson, M. Derek MacKenzie, more

Global Change Biology > 27 > 19 > 4711 - 4726

Northern peatlands store a globally significant amount of soil organic carbon, much of it found in rapidly thawing permafrost. Permafrost thaw in peatlands often leads to the development and expansion of thermokarst bogs, where microbial activity will determine the stability of the carbon storage and the release of greenhouse gases. In this study, we compared potential enzyme activities between young...

article

Functional diversity and trait composition of vascular plant and Sphagnum moss communities during peatland succession across land uplift regions

Anna M. Laine, Tapio Lindholm, Mats Nilsson, Oleg Kutznetsov, more

Journal of Ecology > 109 > 4 > 1774 - 1789

Most of the carbon accumulated into peatlands is derived from Sphagnum mosses. During peatland development, the relative share of vascular plants and Sphagnum mosses in the plant community changes, which impacts ecosystem functions. Little is known on the successional development of functional plant traits or functional diversity in peatlands, although this could be a key for understanding the...

article

Rewiring of peatland plant–microbe networks outpaces species turnover

Bjorn J. M. Robroek, Magalí Martí, Bo H. Svensson, Marc G. Dumont, more

Oikos > 130 > 3 > 339 - 353

Enviro–climatic changes are thought to be causing alterations in ecosystem processes through shifts in plant and microbial communities; however, how links between plant and microbial communities change with enviro–climatic change is likely to be less straightforward but may be fundamental for many ecological processes. To address this, we assessed the composition of the plant community and the prokaryotic...

article

Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species‐specific anatomical traits

Vincent E. J. Jassey, Constant Signarbieux

Global Change Biology > 25 > 11 > 3859 - 3870

Climate change will influence plant photosynthesis by altering patterns of temperature and precipitation, including their variability and seasonality. Both effects may be important for peatlands as the carbon (C) sink potential of these ecosystems depends on the balance between plant C uptake through photosynthesis and microbial decomposition. Here, we show that the effect of climate warming on Sphagnum...

article

Sphagnum Species Modulate their Phenolic Profiles and Mycorrhizal Colonization of Surrounding Andromeda polifolia along Peatland Microhabitats

Geneviève Chiapusio, Vincent E. J. Jassey, Floriant Bellvert, Gilles Comte, more

Journal of Chemical Ecology > 2018 > 44 > 12 > 1146-1157

Sphagnum mosses mediate long-term carbon accumulation in peatlands. Given their functional role as keystone species, it is important to consider their responses to ecological gradients and environmental changes through the production of phenolics. We compared the extent to which Sphagnum phenolic production was dependent on species, microhabitats and season, and how surrounding dwarf shrubs responded...

article

Vapor–pressure deficit and extreme climatic variables limit tree growth

Paula Sanginés de Cárcer, Yann Vitasse, Josep Peñuelas, Vincent E. J. Jassey, more

Global Change Biology > 24 > 3 > 1108 - 1122

Assessing the effect of global warming on forest growth requires a better understanding of species‐specific responses to climate change conditions. Norway spruce and European beech are among the dominant tree species in Europe and are largely used by the timber industry. Their sensitivity to changes in climate and extreme climatic events, however, endangers their future sustainability. Identifying...

article

Tipping point in plant–fungal interactions under severe drought causes abrupt rise in peatland ecosystem respiration

Vincent E. J. Jassey, Monika K. Reczuga, Małgorzata Zielińska, Sandra Słowińska, more

Global Change Biology > 24 > 3 > 972 - 986

Ecosystems are increasingly prone to climate extremes, such as drought, with long‐lasting effects on both plant and soil communities and, subsequently, on carbon (C) cycling. However, recent studies underlined the strong variability in ecosystem's response to droughts, raising the issue of nonlinear responses in plant and soil communities. The conundrum is what causes ecosystems to shift in response...

article

The Impact of Experimental Temperature and Water Level Manipulation on Carbon Dioxide Release in a Poor Fen in Northern Poland

Mateusz Samson, Sandra Słowińska, Michał Słowiński, Mariusz Lamentowicz, more

Wetlands > 2018 > 38 > 3 > 551-563

Peatlands are ecosystems for which carbon budget relies strongly on the meteorological and hydrological conditions. Here, using a manipulative field experiment, we measured ecosystem respiration (R_ECO) over two years (2013–2014) in a poor fen in Poland to estimate the carbon emission in a changing climate. The experiment consisted of warming (open-top chambers - OTC) and water table manipulation....

article

Response to Editor to the comment by Delarue (2016) to our paper entitled ‘Persistent high temperature and low precipitation reduce peat carbon accumulation’

Luca Bragazza, Alexandre Buttler, Bjorn J. M. Robroek, Remy Albrecht, more

Global Change Biology > 23 > 10 > e7 - e8

article

Subordinate plants mitigate drought effects on soil ecosystem processes by stimulating fungi

Pierre Mariotte, Bjorn J. M. Robroek, Vincent E. J. Jassey, Alexandre Buttler, more

Functional Ecology > 29 > 12 > 1578 - 1586

The subordinate insurance hypothesis suggests that highly diverse communities contain greater numbers of subordinate species than less diverse communities. It has previously been reported that subordinate species can improve grassland productivity during drought, but the underlying mechanisms remain undetermined. Using a combination of subordinate species removal and summer drought, we show that...

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INFONA - science communication portal

Search results for: Vincent E. J. Jassey

Development of a digital droplet PCR approach for the quantification of soil micro‐organisms involved in atmospheric CO₂ fixation

Ericoid shrub encroachment shifts aboveground–belowground linkages in three peatlands across Europe and Western Siberia

Linkages between Sphagnum metabolites and peatland CO₂ uptake are sensitive to seasonality in warming trends

Biochemical traits enhance the trait concept in Sphagnum ecology

Contribution of soil algae to the global carbon cycle

Functional Traits 2.0: The power of the metabolome for ecology

Predicting the structure and functions of peatland microbial communities from Sphagnum phylogeny, anatomical and morphological traits and metabolites

Peatland microhabitat heterogeneity drives phototrophic microbe distribution and photosynthetic activity

Contribution of microbial photosynthesis to peatland carbon uptake along a latitudinal gradient

In situ resistance, not immigration, supports invertebrate community resilience to drought intensification in a Neotropical ecosystem

Constraints on potential enzyme activities in thermokarst bogs: Implications for the carbon balance of peatlands following thaw

Functional diversity and trait composition of vascular plant and Sphagnum moss communities during peatland succession across land uplift regions

Rewiring of peatland plant–microbe networks outpaces species turnover

Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species‐specific anatomical traits

Sphagnum Species Modulate their Phenolic Profiles and Mycorrhizal Colonization of Surrounding Andromeda polifolia along Peatland Microhabitats

Vapor–pressure deficit and extreme climatic variables limit tree growth

Tipping point in plant–fungal interactions under severe drought causes abrupt rise in peatland ecosystem respiration

The Impact of Experimental Temperature and Water Level Manipulation on Carbon Dioxide Release in a Poor Fen in Northern Poland

Response to Editor to the comment by Delarue (2016) to our paper entitled ‘Persistent high temperature and low precipitation reduce peat carbon accumulation’

Subordinate plants mitigate drought effects on soil ecosystem processes by stimulating fungi

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