Methanotrophic bacteria in oilsands tailings ponds of northern Alberta
| Autor: | Levente Bodrossy, Allyson L. Brady, Guy C. J. Abell, Xiaoli Dong, Tara Penner, Alireza Saidi-Mehrabad, Zhiguo He, Ivica Tamas, Peter F. Dunfield, Christine E. Sharp, Christoph Wilhelm Sensen, Fauziah F. Rochman |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
DNA
Bacterial Geologic Sediments Methanotroph Methane monooxygenase Stable-isotope probing Microbiology Methylococcaceae Polymerase Chain Reaction Alberta RNA Ribosomal 16S Ponds Ecology Evolution Behavior and Systematics Phylogeny biology Bacteria biology.organism_classification Tailings Methylomonas Petroleum Environmental chemistry Anaerobic oxidation of methane biology.protein Pyrosequencing Metagenome Original Article Methane Gammaproteobacteria |
| Popis: | We investigated methanotrophic bacteria in slightly alkaline surface water (pH 7.4-8.7) of oilsands tailings ponds in Fort McMurray, Canada. These large lakes (up to 10 km(2)) contain water, silt, clay and residual hydrocarbons that are not recovered in oilsands mining. They are primarily anoxic and produce methane but have an aerobic surface layer. Aerobic methane oxidation was measured in the surface water at rates up to 152 nmol CH4 ml(-1) water d(-1). Microbial diversity was investigated via pyrotag sequencing of amplified 16S rRNA genes, as well as by analysis of methanotroph-specific pmoA genes using both pyrosequencing and microarray analysis. The predominantly detected methanotroph in surface waters at all sampling times was an uncultured species related to the gammaproteobacterial genus Methylocaldum, although a few other methanotrophs were also detected, including Methylomonas spp. Active species were identified via (13)CH4 stable isotope probing (SIP) of DNA, combined with pyrotag sequencing and shotgun metagenomic sequencing of heavy (13)C-DNA. The SIP-PCR results demonstrated that the Methylocaldum and Methylomonas spp. actively consumed methane in fresh tailings pond water. Metagenomic analysis of DNA from the heavy SIP fraction verified the PCR-based results and identified additional pmoA genes not detected via PCR. The metagenome indicated that the overall methylotrophic community possessed known pathways for formaldehyde oxidation, carbon fixation and detoxification of nitrogenous compounds but appeared to possess only particulate methane monooxygenase not soluble methane monooxygenase. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|