Blar i forfatter "Tveit, Alexander"

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    • A combined microbial and biogeochemical dataset from high-latitude ecosystems with respect to methane cycle. 

      Barret, Maialen; Gandois, Laure; Thalasso, Frederic; Martinez Cruz, K; Jauregui, Alejandra; Lavergne, C.; Teisserenc, R.; Aguilar, A; Nieto, O.; Etchebehere, C.; Dellagnezze, B.M.; Winkler, P.B.; Fochesatto, Gilberto J.; Tananaev, N.; Svenning, Mette Marianne; Seppey, Victor William Christophe; Tveit, Alexander; Chamy, R.; España, M.S.A.; Mansilla, A.; Van De Putte, Anton; Sweetlove, M.; Murray, Alison E.; Cabrol, Lea (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 ...

    • Decoupling of microbial community dynamics and functions in Arctic peat soil exposed to short term warming 

      Yang, Sizhong; Liebner, Susanne; Svenning, Mette Marianne; Tveit, Alexander (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-12)
      Temperature is an important factor governing microbe-mediated carbon feedback from permafrost soils. The link between taxonomic and functional microbial responses to temperature change remains elusive due to the lack of studies assessing both aspects of microbial ecology. Our previous study reported microbial metabolic and trophic shifts in response to short-term temperature increases in Arctic ...

    • Down-regulation of the bacterial protein biosynthesis machinery in response to weeks, years, and decades of soil warming 

      Söllinger, Andrea; Séneca, Joana; Mathilde, Borg Dahl; Motleleng, Liabo Lillien; Prommer, Judith; Verbruggen, Erik; Sigurdsson, Bjarni D.; Janssens, Ivan A.; Peñuelas, Josep; Urich, Tim; Richter, Andreas; Tveit, Alexander (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-25)
      How soil microorganisms respond to global warming is key to infer future soil-climate feedbacks, yet poorly understood. Here, we applied metatranscriptomics to investigate microbial physiological responses to mediumterm (8 years) and long-term (>50 years) subarctic grassland soil warming of +6°C. Besides indications for a community-wide up-regulation of centralmetabolic pathways and cell replication, ...

    • Five decades of terrestrial and freshwater research at Ny-Ålesund, Svalbard 

      Pedersen, Åshild Ønvik; Convey, P.; Newsham, Kevin K.; Mosbacher, Jesper Bruun; Fuglei, Eva; Ravolainen, Virve; Hansen, Brage Bremset; Jensen, Thomas Correll; Augusti, A.; Biersma, Elisabeth Mackteld; Cooper, Elisabeth J.; Coulson, S.J.; Gabrielsen, Geir W.; Gallet, Jean-Charles; Karsten, U.; Kristiansen, Silje Marie; Svenning, Mette Marianne; Tveit, Alexander; Uchida, M.; Baneschi, I.; Calizza, E.; Cannone, N.; de Goede, E.M.; Doveri, M.; Elster, J.; Giamberini, M.S.; Hayashi, K.; Lang, Simone; Lee, Y.K.; Nakatsubo, T.; Pasquali, V.; Paulsen, I.M.G.; Pedersen, Christina Alsvik; Peng, F.; Provenzale, A.; Pushkareva, E.; Sandström, C.A.M.; Sklet, Vera; Stach, A.; Tojo, M.; Tytgat, B.; Tømmervik, Hans; Velazquez, D.; Verleyen, E.; Welker, J.M.; Yao, Y.-F.; Loonen, M.J.J.E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-19)
      For more than five decades, research has been conducted at Ny-Ålesund, in Svalbard, Norway, to understand the structure and functioning of High-Arctic ecosystems and the profound impacts on them of environmental change. Terrestrial, freshwater, glacial and marine ecosystems are accessible year-round from Ny-Ålesund, providing unique opportunities for interdisciplinary observational and experimental ...

    • The influence of above-ground herbivory on the response of arctic soil methanotrophs to increasing ch4 concentrations and temperatures 

      Rainer, Edda Marie; Seppey, Victor William Christophe; Hammer, Caroline; Svenning, Mette Marianne; Tveit, Alexander (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> ...

    • Long-term warming-induced trophic downgrading in the soil microbial food web 

      Dahl, Mathilde Borg; Söllinger, Andrea; Sigurðsson, Páll; Janssens, Ivan; Peñuelas, Josep; Sigurdsson, Bjarni D.; Richter, Andreas; Tveit, Alexander; Urich, Tim (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-01)
      Climatic warming has been hypothesized to accelerate organic matter decomposition by soil microorganisms and thereby enhance carbon (C) release to the atmosphere. However, the long-term consequences of soil warming on belowground biota interactions are poorly understood. Here we investigate how geothermal warming by 6 °C for more than 50 years affects soil microbiota. Using metatranscriptomics we ...

    • Thermal acclimation of methanotrophs from the genus Methylobacter 

      Tveit, Alexander; Söllinger, Andrea; Rainer, Edda Marie; Didriksen, Alena; Hestnes, Anne Grethe; Motleleng, Liabo; Hellinger, Hans-Jörg; Rattei, Thomas; Svenning, Mette Marianne (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-18)
      Methanotrophs oxidize most of the methane (CH<sub>4</sub>) produced in natural and anthropogenic ecosystems. Often living close to soil surfaces, these microorganisms must frequently adjust to temperature change. While many environmental studies have addressed temperature effects on CH<sub>4</sub> oxidation and methanotrophic communities, there is little knowledge about the physiological adjustments ...