Open AccessMethane cycling in lake sediments and its influence on chironomid larval δ 13 C
Author(s) -
Eller Gundula,
Deines Peter,
Grey Jonathan,
Richnow HansHermann,
Krüger Martin
Publication year - 2005
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1016/j.femsec.2005.04.006
Subject(s) - trophic level , biology , methane , environmental chemistry , dominance (genetics) , ecology , microbial population biology , biogeochemical cycle , carbon cycle , stable isotope probing , population , microcosm , isotopes of carbon , total organic carbon , bacteria , microorganism , ecosystem , chemistry , biochemistry , genetics , demography , sociology , gene
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 13 C‐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 × 10 6 cells 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 (H 2 /CO 2 in Holzsee and acetate in Großer Binnensee), even though differences were minor. In conclusion, the stronger larval 13 C‐depletion in Holzsee was not reflected in differences in the microbial community structure, but in the activity and size of the methanogenic and methanotrophic populations in the lake sediment.