期刊
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
卷 89, 期 9, 页码 -出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/aem.00807-23
关键词
comammox Nitrospira; habitat change; aquaculture reclamation; coastal wetlands; nitrification
This study examined the impact of habitat modifications on comammox Nitrospira communities in coastal wetland sediments in southeastern China. The results showed that sediment grain size and sulfate concentration were important factors influencing the abundance and diversity of comammox Nitrospira. The response of comammox Nitrospira community to habitat change varied by location, and dispersal limitation played a significant role in the community assembly process in coastal wetland sediments.
Complete ammonia oxidizers (comammox Nitrospira) are ubiquitous in coastal wetland sediments and play an important role in nitrification. Our study examined the impact of habitat modifications on comammox Nitrospira communities in coastal wetland sediments across tropical and subtropical regions of southeastern China. Samples were collected from 21 coastal wetlands in five provinces where native mudflats were invaded by Spartina alterniflora and subsequently converted to aquaculture ponds. The results showed that comammox Nitrospira abundances were mainly influenced by sediment grain size rather than by habitat modifications. Compared to S. alterniflora marshes and native mudflats, aquaculture pond sediments had lower comammox Nitrospira diversity, lower clade A.1 abundance, and higher clade A.2 abundance. Sulfate concentration was the most important factor controlling the diversity of comammox Nitrospira. The response of comammox Nitrospira community to habitat change varied significantly by location, and environmental variables accounted for only 11.2% of the variations in community structure across all sites. In all three habitat types, dispersal limitation largely controlled the comammox Nitrospira community assembly process, indicating the stochastic nature of these sediment communities in coastal wetlands.
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