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Similar bacterial growth on dissolved organic matter in anoxic and oxic lake water
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
2Department of Limnology, Uppsala University, Sweden.
2001 (English)In: Aquatic Microbial Ecology, ISSN 0948-3055, E-ISSN 1616-1564, Vol. 24, no 1, 41-49 p.Article in journal (Refereed) Published
Abstract [en]

Anoxic metabolism yields less energy per unit substrate utilized than oxic respiration. In addition, substrate availability is believed to be reduced under anoxic conditions since oxygenases cannot be used. Consequently, it is generally assumed that bacteria grow slower in anoxic environments than in oxic environments. The results of the present study challenge this view. We compared the growth of bacterial assemblages under carbon-limited conditions in lake water under anoxic and oxic conditions. Bioassay experiments were performed with water from 3 lakes differin9 in nutrient concentrations and organic matter content. Amon9 bacteria usin9 the same source of organic matter, median anoxic growth rates were 84 to 110% of oxic growth rates. The total biomass yield durin9 the experiments did not differ between anoxic and oxic treatments. We suggest that anoxic bacterial growth was regulated by substrate availability rather than by metabolic energy yield and that availability of organic matter under anoxic conditions was equal to or even greater than that in oxic treatments. This implies that anoxic decomposition rates may actually have been faster than oxic rates.

Place, publisher, year, edition, pages
2001. Vol. 24, no 1, 41-49 p.
Keyword [en]
DOC, DOM, Anaerobic degradation, Bacteria
National Category
Social Sciences Interdisciplinary
Identifiers
URN: urn:nbn:se:liu:diva-31046DOI: 10.3354/ame024041Local ID: 16755OAI: oai:DiVA.org:liu-31046DiVA: diva2:251869
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.
Series
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 262
Keyword
Ekonsystem i vatten
National Category
Social Sciences Interdisciplinary
Identifiers
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)
Opponent
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2014-08-29Bibliographically approved

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Bastviken, DavidEjlertsson, Jörgen

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