Salinity influence on soil microbial respiration rate of wetland in the Yangtze River estuary through changing microbial community

Xi, Xue Fei; Wang, Lei; Hu, Jia Jun; Tang, Yu S.; Hu, Yu; Fu, Xiao; Sun, Youbin; Tsang, Yiu Fai; Zhang, Yan Nan; Chen, Jin Hai

doi:10.1016/j.jes.2014.07.016

Cited by 31 publications

(6 citation statements)

References 37 publications

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“…Comparison of the functional microbial community structure between the freshwater and brackish sites supports previous findings where salinity gradients displayed unique compositional patterns [ 21 , 44 , 45 ]. This could be explained by the capability of a microorganism’s osmoregulatory functions.…”

Section: Discussionsupporting

confidence: 84%

Salinity Impacts the Functional mcrA and dsrA Gene Abundances in Everglades Marshes

et al. 2023

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Coastal wetlands, such as the Everglades, are increasingly being exposed to stressors that have the potential to modify their existing ecological processes because of global climate change. Their soil microbiomes include a population of organisms important for biogeochemical cycling, but continual stresses can disturb the community’s composition, causing functional changes. The Everglades feature wetlands with varied salinity levels, implying that they contain microbial communities with a variety of salt tolerances and microbial functions. Therefore, tracking the effects of stresses on these populations in freshwater and brackish marshes is critical. The study addressed this by utilizing next generation sequencing (NGS) to construct a baseline soil microbial community. The carbon and sulfur cycles were studied by sequencing a microbial functional gene involved in each process, the mcrA and dsrA functional genes, respectively. Saline was introduced over two years to observe the taxonomic alterations that occurred after a long-term disturbance such as seawater intrusion. It was observed that saltwater dosing increased sulfite reduction in freshwater peat soils and decreased methylotrophy in brackish peat soils. These findings add to the understanding of microbiomes by demonstrating how changes in soil qualities impact communities both before and after a disturbance such as saltwater intrusion.

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Section: Discussionsupporting

confidence: 84%

Salinity Impacts the Functional mcrA and dsrA Gene Abundances in Everglades Marshes

et al. 2023

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“…Soil salinity is recognized as a principle factor influencing bacterial community composition in newly formed, natural coastal wetlands in the YRD (Lv et al, 2016). High salinity influences coastal wetland ecosystems in several ways: suppressing plant growth and heterotrophic metabolism, decreasing soil quality and diversity of heterotrophic bacteria (e.g., Betaproteobacteria, Chloroflexi, and Bacteroidetes), and negatively impacting ecosystem stability (Abed et al, 2010; Székely et al, 2013; Morrissey et al, 2014; Xi et al, 2014; Yang et al, 2016). The difference in phylogenetic groups in wetlands with various types of vegetation could reflect the functional discrepancy of bacterial communities along a salinity gradient.…”

Section: Discussionmentioning

confidence: 99%

Variations in Soil Bacterial Composition and Diversity in Newly Formed Coastal Wetlands

Wen-bing

Ruan

et al. 2019

Front. Microbiol.

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Coastal ecosystems experience some of the most active land–ocean interactions in the world, and they are characterized by high primary productivity and biological diversity in the sediment. Given the roles of microorganisms in soil biogeochemical cycling and their multifaceted influence on soil ecosystems, it is critical to understand the variations and drivers of soil microbial communities across coastal ecosystems. Here, we studied soil bacterial community dynamics at different sites (from seawater to freshwater) in the Yellow River Delta, China. Bacterial community composition and diversity over four seasons were analyzed through 16S rRNA genes. Notably, the bacterial community near the ocean had the lowest alpha-diversity when compared with the other sites. No significant differences in bacterial communities among seasons were found, indicating that seasonal variation in temperature had little influence on bacterial community in the newly formed wetlands in the Yellow River Delta. Bacterial community structure changed substantially along the salinity gradient, revealing a clear ecological replacement along the gradual transformation gradient from freshwater to seawater environment. Redundancy analysis revealed that salinity was the main driver of variations in bacterial community structure and explained 17.5% of the variability. Our study provides a better understanding of spatiotemporally determined bacterial community dynamics in coastal ecosystems.

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“…shape the embedded microbial communities, which, as the key factors in a wide range of biogeochemical cycles, in turn mold environmental characteristics and functions (8). Many studies have examined the wetland microbiota and their changes, for example, the microbial community structures and their shifts in salinity gradients of the Baltic Sea (9), the Delaware Bay (10), or the Yangtze River estuary (11). Some additional studies also explored the ecosystem functions of wetland microbiota (12)(13)(14)(15).…”

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confidence: 99%

Shifts in the Bacterial Population and Ecosystem Functions in Response to Vegetation in the Yellow River Delta Wetlands

Wang

Zheng

et al. 2020

mSystems

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Vegetation represents probably the most crucial step for the ecosystem functions of wetlands, but it is unclear how microbial populations and functions shift along with vegetation. In this study, we found that the richness and diversity of soil bacteria increased with vegetation levels and that the community composition was distinctly shifted from bare to vegetative places. The bare land displayed an extremely high abundance of Cyanobacteria as a monospecies genus, while a Gemmatimonadetes genus was predominant as multiple species in all the vegetative wetlands, suggesting their important ecosystem functions and potential mechanisms. Expression of the genes related to photosynthesis was enriched exclusively in bare land. Genes involved in biological organic carbon metabolism and the cycling of main elements (C, N, S, and P) were highly expressed in vegetative wetlands and were mostly included in the metagenome-assembled genome (MAG) of Gemmatimonadetes. Some compounds identified from soil metabolomic results also corresponded to pathways involving these key active genes. Cyanobacteria is thus responsible for the carbon sink in early infertile wetlands, and Gemmatimonadetes plays a crucial role in ecosystem functions in vegetative wetlands. Our results highlight that the soil microbial populations execute ecosystem functions for wetlands and that vegetation is the determinant for the population and functional shifts in the coastal estuarine wetland of the Yellow River Delta. IMPORTANCE Vegetation probably represents the most crucial step for the ecosystem functions of wetlands, but it is unclear how microbial populations and functions shift in pace with the colonization and succession of vegetation. In this study, we found that a Cyanobacteria monospecies genus and a Gemmatimonadetes multispecies genus are fastidiously predominant in the bare and vegetative wetlands of the Yellow River Delta, respectively. Consistently, photosynthesis genes were enriched exclusively in bare land, while genes involved in biological organic carbon metabolism and the cycling of main elements were highly expressed in vegetative wetlands, were mostly included in the MAG of Gemmatimonadetes, and were consistent with soil metabolomic results. Our results provide insight into the adaptive succession of predominant bacterial species and their ecosystem functions in response to the presence of vegetation.

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Salinity influence on soil microbial respiration rate of wetland in the Yangtze River estuary through changing microbial community

Cited by 31 publications

References 37 publications

Salinity Impacts the Functional mcrA and dsrA Gene Abundances in Everglades Marshes

Salinity Impacts the Functional mcrA and dsrA Gene Abundances in Everglades Marshes

Variations in Soil Bacterial Composition and Diversity in Newly Formed Coastal Wetlands

Shifts in the Bacterial Population and Ecosystem Functions in Response to Vegetation in the Yellow River Delta Wetlands

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