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Methane as a source of carbon and energy for lake pelagic food webs
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.
Department of Microbiology, Swedish University of Agricultural Sciences.
Department of Limnology, Uppsala University.
2003 (English)In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 84, no 4, 969-981 p.Article in journal (Refereed) Published
Abstract [en]

Water-column methane oxidation can represent a substantial carbon transformation pathway in lakes, and circumstantial evidence indicates that methane may be a potentially important source of carbon for pelagic food webs. We estimated methanotrophic bacterial production (MBP), methanotrophic bacterial growth efficiency (MBGE), heterotrophic bacterial production (HBP), primary production (PP), and the relative contribution of methanotrophic bacteria to overall bacterial biomass in three very different lakes during summer and winter. In addition, we measured stable carbon isotope ratios in particulate organic matter (POM), surface sediments, zooplankton, and methane. MBP corresponded to 0.3-7% of the organic C production by primary producers, and 0.5-17% of HBP during summer. During winter, MBP was 3-120% of HBP. MBP generally dominated the heterotrophic bacterial production at greater depths. Methanotrophic biomass was 3-11% of total bacterial biomass on a depth-integrated basis. Zooplankton were generally more depleted in 13C than POM. If phytoplankton d13C signatures were -35 to -30ë, such as the POM signals, observed zooplankton signatures could be explained by a fraction of 5-15% methanotrophic bacteria in their diet. The results indicate that methanotrophic bacteria can provide a significant food source for zooplankton, and that methane oxidation represents a potentially important benthic-pelagic carbon and energy link in many lakes, particularly during winter.

Place, publisher, year, edition, pages
2003. Vol. 84, no 4, 969-981 p.
Keyword [en]
aquatic food webs, bacterial growth efficiency, carbon cycling, methane, as source of C and energy in lake food webs, methane oxidation, methanotrophic bacteria, stable isotopes, Swedish lakes, zooplankton
National Category
Social Sciences Interdisciplinary
Identifiers
URN: urn:nbn:se:liu:diva-30671DOI: 10.1890/0012-9658(2003)084[0969:MAASOC]2.0.CO;2Local ID: 16272OAI: oai:DiVA.org:liu-30671DiVA: diva2:251494
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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