Swedish University of Agricultural Sciences, Uppsala
The incorporation of carbon into biomass is the basis for all life. In regards of carbon assimilation, most ecosystems are net autotrophic, thus, the amount of CO2 they can transform into organic form is sufficient to support the whole food web. However, especially in the northern parts of the world there are habitats in which the food web is extensively relying on external supply of organic matter. These heterotrophic systems typically release greenhouse gases, such as carbon dioxide and methane, into the atmosphere, enhancing the climate change. Such environments include, for example, many of the aquatic habitats in the boreal and subarctic region.
Our research focus is in the microbes controlling the carbon cycle of these heterotrophic habitats, with special interest in poorly known processes and organisms. The main on-going projects are studying the ecology of aquatic fungi with focus on organisms and processes degrading organic matter, microbial processes mitigating greenhouse gas emissions and functional genomics of candidate phylum Parcubacteria. Our methodology is combining cultivation techniques to molecular biology tools and biogeochemical analysis for a comprehensive analysis of the microbial contributions to the carbon cycle.
Peura S, Eiler A, Bertilsson S, Nykänen H, Tiirola M, Jones RI. 2012. Distinct and diverse anaerobic bacterial communities in boreal lakes dominated by candidate division OD1. ISME Journal 6, 1640-1652.
Peura S, Kankaala P, Nykänen H, Eiler A, Tiirola M, Jones RI. 2014. Enhanced greenhouse gas emissions from a humic lake and associated changes in plankton communities following an experimental increase in dissolved organic carbon loading. Biogeochemistry 118: 177-194.
Roiha T, Peura S, Cusson M, Rautio M. Habitat and season determine the interplay between DOM pool and bacteria in subarctic freshwaters. Scientific Reports 6: 34456.
Peura S, Sinclair L, Bertilsson S, Eiler A. 2015. Metagenomic insights into strategies of aerobic and anaerobic carbon and nitrogen transformation in boreal lakes. Scienfific Reports 5: 12102.