Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.femsec.2005.04.006
Titel (primär) Methane cycling in lake sediments and its influence on chironomid larval δ13C
Autor Eller, G.; Deines, P.; Grey, J.; Richnow, H.H.; Krüger, M.
Journal / Serie FEMS Microbiology Ecology
Erscheinungsjahr 2005
Department ISOBIO
Band/Volume 54
Heft 3
Seite von 339
Seite bis 350
Sprache englisch
Keywords carbon cycle;carbon stable isotopes;methanogenesis;Archaea;Mmethanotroph;Chironomid larvae

Stable carbon isotope analysis of chironomid larvae gave rise to the hypothesis that methane-oxidizing bacteria can provide an important food source for higher trophic levels in lakes. To investigate the importance of the methane cycle for the larval stable carbon signatures, isotope analysis and microbiological and biogeochemical investigations were combined. The study was based on comparison of a dimictic lake (Holzsee) and a polymictic, shallow lake (Großer Binnensee), both located in northern Germany. Both lakes are inhabited by Chironomus plumosus larvae, which exhibited a stronger 13C-depletion in Holzsee than in Großer Binnensee, indicating a greater contribution of methane–carbon in the former. Indeed, the processes involved in the microbial methane cycle were found to be more active in Holzsee, showing higher potential methane production and methane oxidation rates. Consistently, cell numbers of methane-oxidizing bacteria were with 0.5 − 1.7× 106 cells inline image about one order of magnitude higher in Holzsee than in Großer Binnensee. Molecular analysis of the microbial community structure revealed no differences in the methanotrophic community between the two lakes, with a clear dominance of type I methanotrophs. The methanogenic population seemed to be adapted to the prevailing substrate in the respective lake (H2/CO2 in Holzsee and acetate in Großer Binnensee), even though differences were minor.

dauerhafte UFZ-Verlinkung
Eller, G., Deines, P., Grey, J., Richnow, H.H., Krüger, M. (2005):
Methane cycling in lake sediments and its influence on chironomid larval δ13C
FEMS Microbiol. Ecol. 54 (3), 339 - 350