Active Methanotrophs and Their Response to Temperature in Marine Environments: An Experimental Study
Aerobic methane (CH<sub>4</sub>) oxidation plays a significant role in marine CH<sub>4</sub> consumption. Temperature changes resulting from, for example, global warming, have been suggested to be able to influence methanotrophic communities and their CH<sub>4</sub&g...
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| Auteurs principaux: | , , , , , , |
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| Format: | article |
| Langue: | EN |
| Publié: |
MDPI AG
2021
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| Accès en ligne: | https://doaj.org/article/b7f5eb3309c146b29fbbdbd20783224b |
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| Résumé: | Aerobic methane (CH<sub>4</sub>) oxidation plays a significant role in marine CH<sub>4</sub> consumption. Temperature changes resulting from, for example, global warming, have been suggested to be able to influence methanotrophic communities and their CH<sub>4</sub> oxidation capacity. However, exact knowledge regarding temperature controls on marine aerobic methane oxidation is still missing. In this study, CH<sub>4</sub> consumption and the methanotrophic community structure were investigated by incubating sediments from shallow (Bohai Bay) and deep marine environments (East China Sea) at 4, 15, and 28 °C for up to 250 days. The results show that the abundance of the methanotrophic population, dominated by the family <i>Methylococcaceae</i> (type I methanotrophs), was significantly elevated after all incubations and that aerobic methane oxidation for both areas had a strong temperature sensitivity. A positive correlation between the CH<sub>4</sub> oxidation rate and temperature was witnessed in the Bohai Bay incubations, whereas for the East China Sea incubations, the optimum temperature was 15 °C. The systematic variations of <i>pmoA</i> OTUs between the Bohai Bay and East China Sea incubations indicated that the exact behaviors of CH<sub>4</sub> oxidation rates with temperature are related to the different methanotrophic community structures in shallow and deep seas. These results are of great significance for quantitatively evaluating the biodegradability of CH<sub>4</sub> in different marine environments. |
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