Document Detail

Methane-derived carbon flows through methane-oxidizing bacteria to higher trophic levels in aquatic systems.
MedLine Citation:
PMID:  17472629     Owner:  NLM     Status:  MEDLINE    
Recent investigations have shown that biogenic methane can be a carbon source for macro invertebrates in freshwater food webs. Stable carbon isotopic signatures, used to infer an organism's food source, indicated that methane can play a major role in the nutrition of chironomid larvae. However, the pathway of methane-derived carbon into invertebrate biomass is still not confirmed. It has been proposed that chironomid larvae ingest methane-oxidizing bacteria (MOB), but this has not been experimentally demonstrated to date. Using (13)C-labelled methane we could show for the first time that chironomid larvae assimilate methane-derived carbon through MOB. Chironomid larval biomass was significantly (13)C-enriched after dwelling for 10 days in lake sediment enriched with labelled methane. Moreover, phospholipid fatty acids diagnostic for MOB were detected in larval tissue and were significantly (13)C-enriched, which encompasses the (13)C-uptake predicted for a methane-based nutrition. Additionally, chironomid larvae fed on sediment and water-column derived MOB biomass.
Peter Deines; Paul L E Bodelier; Gundula Eller
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental microbiology     Volume:  9     ISSN:  1462-2912     ISO Abbreviation:  Environ. Microbiol.     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-05-02     Completed Date:  2007-05-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883692     Medline TA:  Environ Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1126-34     Citation Subset:  IM    
Max Planck Institute for Limnology, Department of Physiological Ecology, August-Thienemann-Strasse 2, 24306 Plön, Germany.
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MeSH Terms
Carbon Isotopes / metabolism
Chironomidae / metabolism*
Fatty Acids / metabolism*
Food Chain*
Fresh Water / microbiology*
Geologic Sediments / microbiology*
Larva / metabolism
Methane / metabolism*
Phospholipids / metabolism
Reg. No./Substance:
0/Carbon Isotopes; 0/Fatty Acids; 0/Phospholipids; 74-82-8/Methane

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