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Simultaneous measurements of organic carbon mineralization and bacterial production in oxic and anoxic lake sediments
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, Department of Physics, Chemistry and Biology, Biology.
Department of Limnology, Uppsala University.
2003 (English)In: Microbial Ecology, ISSN 0095-3628, E-ISSN 1432-184X, Vol. 46, no 1, 73-82 p.Article in journal (Refereed) Published
Abstract [en]

Based on work in marine sediments it can be hypothesized that (i) overall OM mineralization depends on the enzymatic capacity and is largely independent from the energy yield, (ii) similar oxic and anoxic rates are expected for fresh OM, while oxic rates should be faster for old OM that is partially degraded or adsorbed to particles, and (iii) that the thermodynamic energy yield does not regulate mineralization, but primarily determines the energy fraction allocated to bacterial production (BP). We addressed these hypotheses by simultaneous measurements of mineralization rates (MR) and BP in sediments from a eutrophic lake, along with MR measurements in sediments of a dystrophic lake. Anoxic MR were 44 and 78% of oxic MR in the eutrophic and dystrophic lake, respectively, which was always higher than expected given the theoretical energy yields. The BP:MR ratio was 0.94 and 0.24 in the oxic and anoxic treatments, respectively, in accordance with the expected energy yields. Thus, the results support all three hypotheses above. We also critically discuss BP measurements in sediments and suggest that bacterial growth efficiency values from simultaneous MR and BP measurements can be used to evaluate the reliability of BP estimates.

Place, publisher, year, edition, pages
2003. Vol. 46, no 1, 73-82 p.
National Category
Social Sciences Interdisciplinary
URN: urn:nbn:se:liu:diva-30668DOI: 10.1007/s00248-002-1061-9Local ID: 16268OAI: diva2:251491
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2012-06-27Bibliographically approved
In thesis
1. Anoxic degradation of organic matter in lakes: implications for carbon cycling and aquatic food webs
Open this publication in new window or tab >>Anoxic degradation of organic matter in lakes: implications for carbon cycling and aquatic food webs
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Considerable evidence from laboratory studies and marine environments suggests that degradation of organic matter (OM) is restricted under anoxic conditions compared to when molecular oxygen (O2) is present. However, other studies contradict this view since they found similar OM degradation rates and bacterial growth rates under both oxic and anoxic conditions in aquatic environments. Studies from freshwater environments are rare, and have been primarily based on bacterial production estimates. Anoxic degradation of OM in lakes is commonly considered to be slow and of little importance for overall lake food webs compared to oxic degradation. The present thesis and the work it is based on challenge this view. First, the performance of a commonly used method to measure bacterial production was tested in both oxic and anoxic lake water. Then, the oxic and anoxic potentials of bacterial growth and OM mineralization were compared in lake water and sediment. In addition, I assessed the potential of carbon transfer from methane (CH4; i.e. an end-product of anoxic degradation) to pelagic food webs. Three methods for measuring water column methane oxidation were evaluated. Then, the potential transport of methane carbon into the microbial community via methane oxidation, and further -up the food web- into the zooplankton community was estimated. Results indicate 1) that OM degradation and bacterial growth may be similar in oxic and anoxic lake environments, 2) that OM characteristics may be more important for the mineralization than the O2 regime per se in the short term (daysweeks), and 3) that methane can be a significant source of carbon and energy for pelagic food webs. This suggests that the anoxic carbon metabolism may be extensive and potentially important for pelagic organisms in many lakes.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2002. 55 p.
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 262
Ekonsystem i vatten
National Category
Social Sciences Interdisciplinary
urn:nbn:se:liu:diva-29575 (URN)14951 (Local ID)91-7373-436-5 (ISBN)14951 (Archive number)14951 (OAI)
Public defence
2002-11-01, Sal Elysion, Hus-T, Universitetsområdet Valla, Linköping, 10:00 (Swedish)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2014-08-29Bibliographically approved

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Bastviken, David
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