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- W370904340 abstract "Saarenheimo, Jatta Microbial controls of greenhouse gas emissions from boreal lakes Jyvaskyla: University of Jyvaskyla, 2015, 56 p. (Jyvaskyla Studies in Biological and Environmental Science ISSN 1456-9701; 299) ISBN 978-951-39-6126-8 (nid.) ISBN 978-951-39-6127-5 (PDF) Yhteenveto: Metsajarvien kasvihuonekaasujen mikrobitasoinen saately Diss. Biogeochemical processes in stratified boreal lakes promote or reduce greenhouse gas (GHG; CO2, CH4 and N2O) emissions in distinct compartments. In this thesis environmental and biotic controls of microbially-mediated GHG processes were studied at a multi-lake scale as well as in a whole-lake experiment. Microbial communities, specific microbial groups and functional genes were studied using molecular methods, and data were combined with environmental and gas concentration measurements. Aerobic, microaerobic and anaerobic zones of a small stratified lake were shown to support distinct microbial communities, which were mostly controlled by seasonal succession and oxygen concentration. High biomasses of anaerobic photosynthetic green sulphur bacteria (GSB) of the genus Chlorobium were found where light intensities were sufficient to support their growth in the anoxic zone. During a three year whole-lake experiment, the effect of trophic cascades on the microbial communities and processes was studied by adding fish (European perch, Perca fluviatilis) to one basin of an experimentally divided fishless lake. This removed nearly all zooplankton and released methanotrophic bacteria from grazing by Daphnia sp., allowing more methane oxidation. These cascading impacts reduced CH4 efflux from the basin to which fish were added to one quarter the efflux from the fishless basin. The genetic potential for denitrification (studied with functional genes nirS, nirK, nosZI and nosZII), whereby N2O is produced as an intermediate product, was wide spread in all studied lakes and was driven by only a few core proteobacterial species. Interlake variation in N2O accumulation was connected to the relative abundance of nitrite versus N2O reductase genes, which co-varied with the nitrate concentration. Thus the abundance of GSB, methanotrophs, and denitrifiers were all found to impact on GHG emissions from boreal lakes, with a strong control by dissolved oxygen concentration." @default.
- W370904340 created "2016-06-24" @default.
- W370904340 creator A5024212445 @default.
- W370904340 date "2015-01-01" @default.
- W370904340 modified "2023-09-24" @default.
- W370904340 title "Microbial controls of greenhouse gas emissions from boreal lakes" @default.
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