Anna Wallenius Postdoctoral fellow
Contact
Name and title: Anna WalleniusPostdoctoral fellow
Mail: anna.wallenius@su.se
Phone: +4686747541
ORCID0000-0002-1510-4318 Länk till annan webbplats.
Workplace: Stockholm University Baltic Sea Centre Länk till annan webbplats.
Visiting address Svante Arrhenius väg 20 F, plan 5
Postal address Stockholms universitets Östersjöcentrum106 91 Stockholm
About me
I am an environmental microbiologist with an interest in how microbial processes are coupled to different biogeochemical cycles in oxygen-depleted areas, such as marine sediments. Human-induced eutrophication and climate change increase the oxygen loss especially in coastal areas, and this has an impact in microbial processes such as greenhouse gas production. I am interested in studying how the changing environment affects different microorganisms (bacteria, archaea and viruses) in coastal systems and how this is reflected in greenhouse gas emissions from these systems.
My research focuses on microorganisms involved in greenhouse gas-cycling microorganisms in coastal areas of the Baltic Sea. Methane and nitrous oxide are both potent greenhouse gases and they can be produced as well as consumed by microorganisms. The key focus in my research is to understand which microorganisms are responsible, how active are they, and how environmental factors affect their abundance and activity. I use multi-omics methods such as metagenomics and metatranscriptomics to answer these questions, and I couple this with environmental data such as chemical and gas measurements to understand how these microbes regulate and are affected by biogeochemical cycles involved in greenhouse gas emissions. My project is a collaboration between the Baltic Sea Centre and SciLifeLab, which enables me to combine regular sampling campaigns in different systems, with molecular and bioinformatic analysis.
Selected Publications
Wallenius, A.J., Leu, A.O., Klomp, R., McIlroy, S.J., Tyson, G.W., Slomp, C.P. & Jetten, M.S.M (2026). Potential for metal-coupled methane oxidation by Candidatus Methanocomedenaceae in coastal sediments. Preprint on bioRxiv. https://doi.org/10.64898/2026.03.20.712598
Klomp, R.*, Wallenius, A.J.*, van Helmond, N.A.G.M., Lenstra, W.K., Żygadłowska, O.M., Jetten, M.S.M., & Slomp, C.P. (2026). Potential for Manganese Oxide Driven Anaerobic Methane Oxidation in Sediments of a Seasonally Euxinic Coastal Basin. Estuaries and Coasts, 49, 72. https://doi.org/10.1007/s12237-026-01685-7
Wallenius, A.J.*, Sivan, M.*, Popa, M.E., Slomp, C.P., Röckmann, T., & Jetten, M.S.M. (2026). Clumped isotopes as fingerprints of microbial methane production pathways in marine sediments. Limnology and Oceanography Letters, 11, e70074. https://doi.org/10.1002/lol2.70074
Sivan, M., Wallenius, A J., Röckmann, T., Jetten, M.S.M., Slomp, C.P., Greule, M., Keppler, F., Gilbert, A., Yamada, K., Moonen, R.P.J. & Popa, M.E. (2025). Pathway-specific bulk and clumped isotope signatures of methane production in marine sediment incubations. Biogeochemistry, 168, 90. https://doi.org/10.1007/s10533-025-01279-8
Wallenius, A.J., Venetz, J., Żygadłowska, O.M., Lenstra, W.K., van Helmond, N.A.G.M., Dalcin Martins, P., Slomp, C.P. & Jetten, M.S.M. (2025). A ubiquitous and diverse methanogenic community drives microbial methane cycling in eutrophic coastal sediments. FEMS Microbiology Ecology, 101. https://doi.org/10.1093/femsec/fiaf075
Dalcin Martins, P., de Monlevad, J.P.R.C., Echeveste Medrano, M., Lenstra, W.K., Wallenius, A.J., Hermans, M., Slomp, C.P., Welte, C.U., Jetten, M.S.M. & van Helmond, N.A.G.M. (2024) Sulfide toxicity as key control on anaerobic oxidation of methane in eutrophic coastal sediments, Environ. Sci. Technol., 58 (26), 11421-11435. https://doi.org/10.1021/acs.est.3c10418
Wallenius, A.J., Dalcin Martins, P., Slomp, C.P. & Jetten, M.S.M. (2021) Anthropogenic and Environmental Constraints on the Microbial Methane Cycle in Coastal Sediments. Front. Microbiol. 12:631621. https://doi.org/10.3389/fmicb.2021.631621