English
norskBlar i forfatter "Seppey, Victor William Christophe"
Viser treff 1-9 av 9
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Assessing the responses of Sphagnum micro-eukaryotes to climate changes using high throughput sequencing
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-18)Current projections suggest that climate warming will be accompanied by more frequent and severe drought events. Peatlands store ca. one third of the world’s soil organic carbon. Warming and drought may cause peatlands to become carbon sources through stimulation of microbial activity increasing ecosystem respiration, with positive feedback effect on global warming. Micro-eukaryotes play a key role ... -
Biogeography of microbial communities in high-latitude ecosystems: Contrasting drivers for methanogens, methanotrophs and global prokaryotes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-27)Methane-cycling is becoming more important in high-latitude ecosystems as global warming makes permafrost organic carbon increasingly available. We explored 387 samples from three high-latitudes regions (Siberia, Alaska and Patagonia) focusing on mineral/organic soils (wetlands, peatlands forest), lake/pond sediment and water. Physicochemical, climatic and geographic variables were integrated ... -
A combined microbial and biogeochemical dataset from high-latitude ecosystems with respect to methane cycle
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-04)High latitudes are experiencing intense ecosystem changes with climate warming. The underlying methane (CH4) cycling dynamics remain unresolved, despite its crucial climatic feedback. Atmospheric CH<sub>4</sub> emissions are heterogeneous, resulting from local geochemical drivers, global climatic factors, and microbial production/consumption balance. Holistic studies are mandatory to capture ... -
A combined microbial and biogeochemical dataset from high-latitude ecosystems with respect to methane cycle.
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-04)High latitudes are experiencing intense ecosystem changes with climate warming. The underlying methane (CH<sub>4</sub>) cycling dynamics remain unresolved, despite its crucial climatic feedback. Atmospheric CH<sub>4</sub> emissions are heterogeneous, resulting from local geochemical drivers, global climatic factors, and microbial production/consumption balance. Holistic studies are mandatory to ... -
Greater topoclimatic control of above‐ versus below‐ground communities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-31)Assessing the degree to which climate explains the spatial distributions of different taxonomic and functional groups is essential for anticipating the effects of climate change on ecosystems. Most effort so far has focused on above-ground organisms, which offer only a partial view on the response of biodiversity to environmental gradients. Here including both above- and below-ground organisms, we ... -
The influence of above-ground herbivory on the response of arctic soil methanotrophs to increasing ch4 concentrations and temperatures
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-02)Rising temperatures in the Arctic affect soil microorganisms, herbivores, and peatland vegetation, thus directly and indirectly influencing microbial CH<sub>4</sub> production. It is not currently known how methanotrophs in Arctic peat respond to combined changes in temperature, CH<sub>4</sub> concentration, and vegetation. We studied methanotroph responses to temperature and CH<sub>4</sub> ... -
Methanotroph populations and CH 4 oxidation potentials in High Arctic peat are altered by herbivory induced vegetation change
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-08)Methane oxidizing bacteria (methanotrophs) within the genus <i>Methylobacter</i> constitute the biological filter for methane (CH<sub>4</sub>) in many Arctic soils. Multiple <i>Methylobacter</i> strains have been identified in these environments but we seldom know the ecological significance of the different strains. High-Arctic peatlands in Svalbard are heavily influenced by herbivory, leading to ... -
Niche Conservatism Drives the Elevational Diversity Gradient in Major Groups of Free-Living Soil Unicellular Eukaryotes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-30)Ancestral adaptations to tropical-like climates drive most multicellular biogeography and macroecology. Observational studies suggest that this niche conservatism could also be shaping unicellular biogeography and macroecology, although evidence is limited to Acidobacteria and testate amoebae. We tracked the phylogenetic signal of this niche conservatism in far related and functionally contrasted ... -
Protist taxonomic and functional diversity in soil, freshwater and marine ecosystems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-19)Protists dominate eukaryotic diversity and play key functional roles in all ecosystems, particularly by catalyzing carbon and nutrient cycling. To date, however, a comparative analysis of their taxonomic and functional diversity that compares the major ecosystems on Earth (soil, freshwater and marine systems) is missing. Here, we present a comparison of protist diversity based on standardized high ...
