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Sökning: L773:0012 9658 OR L773:1939 9170 > Methane as a source...

Methane as a source of carbon and energy for lake pelagic food webs

Bastviken, David, 1971- (författare)
Linköpings universitet,Tema vatten i natur och samhälle,Filosofiska fakulteten
Ejlertsson, Jörgen (författare)
Linköpings universitet,Tema vatten i natur och samhälle,Filosofiska fakulteten
Sundh, Ingvar (författare)
Department of Microbiology, Swedish University of Agricultural Sciences
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Tranvik, Lars (författare)
Department of Limnology, Uppsala University
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 (creator_code:org_t)
2003
2003
Engelska.
Ingår i: Ecology. - 0012-9658 .- 1939-9170. ; 84:4, s. 969-981
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • 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.

Ämnesord

SAMHÄLLSVETENSKAP  -- Annan samhällsvetenskap -- Tvärvetenskapliga studier inom samhällsvetenskap (hsv//swe)
SOCIAL SCIENCES  -- Other Social Sciences -- Social Sciences Interdisciplinary (hsv//eng)

Nyckelord

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
INTERDISCIPLINARY RESEARCH AREAS
TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN

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