Organic matter lability modifies the vertical structure of methane-related microbial communities in lake sediments
Rissanen, A. J., Jilbert, T., Simojoki, A., Mangayil, R., Aalto, S. L., Khanongnuch, R., Peura, S., & Jäntti, H. (2023). Organic matter lability modifies the vertical structure of methane-related microbial communities in lake sediments. Microbiology Spectrum, Early online. https://doi.org/10.1128/spectrum.01955-23
Published inMicrobiology Spectrum
© 2023 Rissanen et al.
Eutrophication increases the input of labile, algae-derived, organic matter (OM) into lake sediments. This potentially increases methane (CH4) emissions from sediment to water through increased methane production rates and decreased methane oxidation efficiency in sediments. However, the effect of OM lability on the structure of methane oxidizing (methanotrophic) and methane producing (methanogenic) microbial communities in lake sediments is still understudied. We studied the vertical profiles of the sediment and porewater geochemistry and the microbial communities (16S rRNA gene amplicon sequencing) at five profundal stations of an oligo-mesotrophic, boreal lake (Lake Pääjärvi, Finland), varying in surface sediment OM sources (assessed via sediment C:N ratio). Porewater profiles of methane, dissolved inorganic carbon (DIC), acetate, iron, and sulfur suggested that sites with more autochthonous OM showed higher overall OM lability, which increased remineralization rates, leading to increased electron acceptor (EA) consumption and methane emissions from sediment to water. When OM lability increased, the abundance of anaerobic nitrite-reducing methanotrophs (Candidatus Methylomirabilis) relative to aerobic methanotrophs (Methylococcales) in the methane oxidation layer of sediment surface decreased, suggesting that Methylococcales were more competitive than Ca. Methylomirabilis under decreasing redox conditions and increasing methane availability due to their more diverse metabolism (fermentation and anaerobic respiration) and lower affinity for methane. Furthermore, when OM lability increased, the abundance of methanotrophic community in the sediment surface layer, especially Ca. Methylomirabilis, relative to the methanogenic community decreased. We conclude that increasing input of labile OM, subsequently affecting the redox zonation of sediments, significantly modifies the methane producing and consuming microbial community of lake sediments. ...
PublisherAmerican Society for Microbiology
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Additional information about fundingThis study was supported by Academy of Finland (Grant No. 286642, 346751, and 353750 for A.J.R., 323214 for R.M., 307331 for H.J., and 310302 for S.L.A.), joint funding by Olvi Foundation, Jenny and Antti Wihuri Foundation, and Saastamoinen Foundation (for H.J.) and Kone Foundation (Grant No. 201803224 for A.J.R.), and a Tenure Track starting package from University of Helsinki (T.J.). Open access funding was provided by Tampere University. ...
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