Methane cycling in lake sediments and its influence on chironomid larval partial derivative13C

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 (Gro beta er Binnensee), both located in northern Germany. Both lakes are inhabited by Chironomus plumosus larvae, which exhibited a stronger C-13-depletion in Holzsee than in GroBer 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 x 10(6) cells g(dw)(-1) about one order of magnitude higher in Holzsee than in GroBer 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/CO2 in Holzsee and acetate in Grober Binnensee), even though differences were minor. In conclusion, the stronger larval C-13-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. 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.