Schubert, Carsten and Vazquez, Francisco and Lösekann-Behrens, Tina and Knittel, Katrin and Tonolla, Mauro and Boetius, Antje (2011) Evidence for anaerobic oxidation of methane in sediments of a freshwater system (Lago di Cadagno). FEMS microbiology ecology, 76 (1). pp. 26-38. ISSN 1574-6941
![[img]](http://repository.supsi.ch/style/images/fileicons/text.png) |
Text
Schubert et al 2010FEMS Cadagno.pdf Download (434kB) |
Abstract
Anaerobic oxidation of methane (AOM) has been investigated in sediments of a high alpine sulfate-rich lake. Hot spots of AOM could be identified based on geochemical and isotopic evidence. Very high fractionation of methane (α=1.031) during oxidation was observed in the uppermost sediment layers, where methane is oxidized most likely with sulfate-containing bottom waters. However, we could not exclude that other electron acceptors such as iron, or manganese might also be involved. Light carbon isotope values (δ¹³C = -10‰ vs. Vienna Pee Dee Belemnite [VPDB]) of sedimentary carbonates at 16-20 cm sediment depth are indicative of a zone where methane was oxidized and the resulting bicarbonate ions were used for carbonate precipitation. 16S rRNA gene analysis revealed the presence of sequences belonging to the marine benthic groups B, C, and D and to the recently described clade of AOM-associated archaea (AAA). Catalyzed reporter deposition-FISH analysis revealed a high abundance of Deltaproteobacteria, especially of free-living sulfate-reducing bacteria of the Desulfosarcina/Desulfococcus branch of Deltaproteobacteria in the AOM zone. Here, loose aggregations of AAA cells were found, suggesting that AAA might be responsible for oxidation of methane in Lake Cadagno sediments.
| Item Type: | Scientific journal article, Newspaper article or Magazine article |
|---|---|
| Uncontrolled Keywords: | anaerobic methane oxidation; freshwater systems; archaea; sulfate-reducing bacteria; methanotrophs |
| Subjects: | Biological Sciences > Microbiology Biological Sciences > Microbiology > Microbiology not elsewhere classified |
| Depositing User: | Mauro Tonolla |
| Date Deposited: | 18 Jan 2016 08:37 |
| Last Modified: | 30 Aug 2016 12:28 |
| URI: | http://repository.supsi.ch/id/eprint/6895 |
Actions (login required)
 |
View Item |