Diversity of dimethylsulfide-degrading methanogens and sulfate-reducing bacteria in anoxic sediments along the Medway Estuary, UK
| Autor: | Stephania L. Tsola, Oshin Ghurnee, Özge Eyice, Mark Trimmer, Yizhu Zhu, Chloe K. Economou |
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| Rok vydání: | 2021 |
| Předmět: |
Geologic Sediments
Methanogenesis chemistry.chemical_element Microbiology Methane 03 medical and health sciences chemistry.chemical_compound Sulfurimonas Sulfate Sulfate-reducing bacteria Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences biology 030306 microbiology Sulfates fungi biology.organism_classification Sulfur United Kingdom chemistry Microbial population biology Methanococcoides Environmental chemistry Desulfovibrio Estuaries |
| Zdroj: | Environmental microbiologyReferences. 23(8) |
| ISSN: | 1462-2920 |
| Popis: | Methane is a powerful greenhouse gas but the microbial diversity mediating methylotrophic methanogenesis is not well-characterized. One overlooked route to methane is via the degradation of dimethylsulfide (DMS), an abundant organosulfur compound in the environment. Methanogens and sulfate-reducing bacteria (SRB) can degrade DMS in anoxic sediments depending on sulfate availability. However, we know little about the underlying microbial community and how sulfate availability affects DMS degradation in anoxic sediments. We studied DMS-dependent methane production along the salinity gradient of the Medway Estuary (UK) and characterized, for the first time, the DMS-degrading methanogens and SRB using cultivation-independent tools. DMS metabolism resulted in high methane yield (39%-42% of the theoretical methane yield) in anoxic sediments regardless of their sulfate content. Methanomethylovorans, Methanolobus and Methanococcoides were dominant methanogens in freshwater, brackish and marine incubations respectively, suggesting niche-partitioning of the methanogens likely driven by DMS amendment and sulfate concentrations. Adding DMS also led to significant changes in SRB composition and abundance in the sediments. Increases in the abundance of Sulfurimonas and SRB suggest cryptic sulfur cycling coupled to DMS degradation. Our study highlights a potentially important pathway to methane production in sediments with contrasting sulfate content and sheds light on the diversity of DMS degraders. |
| Databáze: | OpenAIRE |
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