Habitat variations of sediment microbial community structure and functions and the influential environmental factors in a Ramsar protected wetland in South China

Ecological functions of coastal wetlands are closely linked to microbiome that is affected by anthropogenic pollution, but related systematic research is rare. This study explored microbial community and physicochemical characteristics of sediments in three habitats, mudflat, mangrove and inter-tida...

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Bibliographic Details
Published in:Marine pollution bulletin 2024-12, Vol.209 (Pt A), p.117166, Article 117166
Main Authors: Lam, Kit-Ling, Tam, Nora Fung-Yee, Xu, Steven Jing-Liang, Mo, Wing-Yin, Tse, Yuet-Tung, Lai, Kaze King-Yip, Chan, Ping-Lung, Lee, Fred Wang-Fat
Format: Article
Language:English
Subjects:
Anthropogenic pollution
Bacteria - genetics
Biodiversity
China
Coastal wetland
Ecosystem
Geologic Sediments - chemistry
Geologic Sediments - microbiology
Microbial function
Microbiota
Proteobacteria
RNA, Ribosomal, 16S
Sediment microbiome
Wetlands
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Summary:Ecological functions of coastal wetlands are closely linked to microbiome that is affected by anthropogenic pollution, but related systematic research is rare. This study explored microbial community and physicochemical characteristics of sediments in three habitats, mudflat, mangrove and inter-tidal shrimp ponds (gei wai), in a Ramsar using 16S amplicon sequencing. Proteobacteria was the most abundant and Vibrio was detected in all habitats. Microbial diversity in mangrove is higher than mudflat, with gei wai in between. Microbial functions predicted by PICRUSt revealed prevalence of carbohydrate and amino acid metabolism, with enrichment of nitrogen metabolism in mangrove habitat. Gene annotation identified approximately 800 intrinsic antibiotic resistance genes (iARGs) and dominant mechanism was antibiotic inactivation. Variation partitioning analysis indicated sediment characteristics together with antibiotics and heavy metals shaped microbiomes and iARGs composition in sediments. This study offers insights into variations of sediment microbial diversity, function and iARGs among different habitats in protected wetlands. •Higher microbial diversity in mangrove than mudflat sediments, gei wei in between•Proteobacteria phylum predominated in wetland sediments and Vibrio was detected.•Nitrogen metabolism was significantly enriched in mangrove sediments.•Antibiotic inactivation was the dominant resistance mechanism.•Sediment characteristics together with pollutants shaped microbes and iARGs.
ISSN:0025-326X
1879-3363
1879-3363
DOI:10.1016/j.marpolbul.2024.117166