Abstract
A reservoir is an important source of methane (CH4), which is consumed by aerobic methane-oxidizing bacteria (MOB), representing the main CH4 sink in water. The central urban area of Chongqing in the Three Gorges Reservoir (TGR) area was selected as the study area in 2021. High-throughput sequencing was used to analyze the community structure and abundance of MOBs. The results showed that Methylocystis (Type II) was the dominant MOB in water, whereas Methylococcus (Type I) and Methylocystis co-dominated the sediments. High water temperature in the study area largely accounted for the predominance of Type II MOBs in the two habitats. Moreover, the influence of environmental factors on MOB community and its interspecific relationship were significantly regulated by the operation of the TGR. In the low-water-level period, NO2−-N and CO2 concentration significantly correlated with Methylocystis, whereas in the high-water-level period, the higher discharge and velocity weakened the influence of all environmental factors on Methylocystis. In addition, the scouring of sediments by increasing discharge in the high-water-level period caused a significant decrease in dissolved CH4 concentration. The decrease in substrate increased interspecific competition within the MOB community, especially between different types of MOBs, in the high-water-level period.
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Funding
This study was funded by the National Natural Science Foundation of China (No. 51609026) and the Research and Innovation Program for Graduate Students in Chongqing (CYS22402).
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Changyue Ouyang and Yujia Gou: investigation, writing original draft, data curation, formal analysis, software. Yu Qin and Yue Liang: funding acquisition, editing and supervision.
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Ouyang, C., Qin, Y., Liang, Y. et al. Community structure and network interaction of aerobic methane-oxidizing bacteria in Chongqing’s central urban area in the Three Gorges Reservoir, China. Environ Sci Pollut Res 30, 56368–56381 (2023). https://doi.org/10.1007/s11356-023-26310-z
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DOI: https://doi.org/10.1007/s11356-023-26310-z