Recovery of subtropical coastal intertidal system prokaryotes from a destruction event and the role of extracellular polymeric substances in the presence of endocrine disrupting chemicals

Yang, Lihua; Xiao, Sirui; Yang, Qian; Luan, Tiangang; Tam, Nora Fung-Yee

doi:10.1016/j.envint.2020.106023

Cited by 10 publications

(5 citation statements)

References 63 publications

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“…The present data showed that both EPS and EPS-C were positively correlated with TOC (Figure 5), and a similar positive relationship between glomalin-related soil protein and soil organic carbon was also reported (Zhang et al, 2015a;Wang et al, 2018). In this study, most of the EPS-C may come from the EPS itself because most organic particles attached to the EPS were removed during EPS extraction and purification, except for some soluble organic colloids (Yang et al, 2020). The present data further indicated a linkage between mangrove zonation and increased EPS-C. As shown in Figure 2, EPS-C contributed 1.84~10.69% of TOC, which is much higher than that of MBC in tropical (subtropical) forests (1.5%) and mangroves (0.45%) (Xu et al, 2013;Wang et al, 2018).…”

Section: Linkage Between Eps and Carbon Storage And Transportation In...supporting

confidence: 83%

“…EPS-induced biofilms further facilitate the formation of microbial aggregates (Wingender et al, 1999). A large number of studies have clarified that EPS can protect cells and microorganisms from external adversities such as heavy metals (Hou et al, 2013;Kang et al, 2014) and persistent organic pollutants (Kang and Park, 2010;Yang et al, 2020). Moreover, EPS can promote the adsorption of macromolecular organic matter with the extracellular matrix due to its viscosity (Li and Ganczarczyk, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of extracellular polymeric substances and soil organic carbon with mangrove zonation along a continuous tidal gradient

et al. 2022

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The importance of mangroves in blue carbon storage has been widely reported. However, the potential contribution of microbial extracellular polymeric substances (EPS) to the carbon pool is still poorly understood in mangrove ecosystems. Thus, a natural mangrove reserve located in Gaoqiao was chosen to investigate the linkage between microbial EPS and sediment organic carbon. Sequential resin extraction, Fourier transform infrared spectroscopy (FTIR), and 16S high-throughput sequencing were employed to determine the variations in EPS and bacterial taxa in different mangrove communities. Both EPS and EPS-C increased significantly with mangrove zonation from seaward to landward, irrespective of the EPS subfractions (colloidal and bound EPS) and components (extracellular protein and polysaccharide). Moreover, both EPS and EPS-C were found to be positively correlated with soil organic carbon. The present data further showed that EPS-C accounted for 1.84~10.69% of TOC in surface sediments. Multiple functional groups (e.g., O-H, N-H, and C=O), which may provide ligands for particle adsorption and complexation, were identified by FTIR. Consistent with the ascend of EPS with mangrove zonation from seaward to landward, the highest transmittance intensity for all functional groups was consistently exhibited in EPS isolated from landward Rhizophoraceae forest. In addition, the present data also indicated an interesting positive linkage between EPS and the abundance of some specific bacterial taxa, such as Rhizobiales, Corynebacteriales, and Gaiellales. In summary, this study claims the importance of EPS in the carbon pool in mangrove ecosystems. The present study may provide a better understanding of the functions of mangroves in carbon stocks.

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Section: Linkage Between Eps and Carbon Storage And Transportation In...supporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Dynamics of extracellular polymeric substances and soil organic carbon with mangrove zonation along a continuous tidal gradient

et al. 2022

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“…The bacterial abundance was determined in fresh sediments in all samples by the direct counting method after 4′,6diamidino-2-phenylindole (DAPI) staining (Porter and Feig, 1980;Yang et al, 2020). The bacterial number was counted using an epifluorescence microscope (Leica DM5000B, Wetzlar, Germany) with blue excitation light (450-490 nm) at a magnification of 10 × 100 under oil.…”

Section: Abundance Of Bacteria and Diatomsmentioning

confidence: 99%

“…Colloidal and bound EPS in all samples were extracted from fresh sediment immediately after collection based on the Dowexresin method (Takahashi et al, 2009;Yang et al, 2020). Twenty milliliters of artificial seawater (ASW) was added to 20 ml of fresh sediment, continuously agitated for 1 h at 4°C in the dark, and centrifuged at 3,500 rpm at 4°C for 15 min, and the supernatant was considered as colloidal fraction.…”

Section: Extraction and Determination Of Eps Fractionsmentioning

confidence: 99%

Effects of wetland, tide, and season on benthic biofilms and related sediment properties in mangrove ecosystems

Yang¹,

Yang²,

Luan

et al. 2022

Front. Mar. Sci.

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Sediment biofilms, mainly composed of diatoms, bacteria, and related extracellular polymeric substances (EPS), play important roles in mangrove ecosystems. In order to better understand the microbial biodiversity in marine environment, this study aims to clarify the effects of wetland, season, and tide on benthic biofilms and related sediment properties based on in situ investigation in two mangrove wetlands (Futian and Qi’ao) in the Pearl River Estuary, South China. Owing to the tide current, the northeastern Futian is more influenced by seawater than the southwestern Qi’ao. As a consequence of the salinity-driven accumulation of nutrients in sediments, Futian is more eutrophic than Qi’ao. Compared to Qi’ao, the higher nutrimental condition in Futian conserves higher abundance of eutrophic indicators of Nitzschia and Cyclotella, which results in higher values of all pigments and bound polysaccharide with varied monosaccharide composition. Compared to the seaward site, the landward site has higher abundance of benthic (pennate) diatoms but lower abundance of planktonic (centric) diatoms due to the varied settling velocity by tidal disturbance. This varied diatom composition leads to higher levels of bound polysaccharide and more monosaccharides in the landward site than in the seaward site. Compared to late spring (March), early summer (May) appears to have similar diatom abundance but more EPS fractions (except bound protein) and monosaccharides due to the higher level of light intensity and temperature. The observed lower bacterial abundance in May than in March might be due to the higher predation pressure. The baseline data on biofilm compositions in mangrove ecosystems from this study can improve the understanding of microbial biodiversity in response to the tidal, temporal, and spatial changes.

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“…This variation in microbial composition potentially contributes to the divergence observed in EPSs contents and synthesis. Notably, changes in the environmental conditions (e.g., nutrient elements, contaminants, pH, temperature, and salinity) also had strongly influence in EPSs synthesis (Yang et al, 2018(Yang et al, , 2020. Might the variances in environmental conditions engender distinctions in the erosion-resistant mechanisms of biocrusts between arid regions and tropical coral islands?…”

Section: Introductionmentioning

confidence: 99%

Biocrust reduces the soil erodibility of coral calcareous sand by regulating microbial community and extracellular polymeric substances on tropical coral island, South China Sea

Wang,

Huang,

Yang

et al. 2023

Front. Microbiol.

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Tropical coral islands assume a pivotal role in the conservation of oceanic ecosystem biodiversity. However, their distinctive environmental attributes and limited vegetation render them highly susceptible to soil erosion. The biological soil crust (biocrust), owing to its significant ecological role in soil stabilization and erosion prevention, is deemed an effective means of mitigating soil erosion on coral island. However, existing research on the mechanisms through which biocrusts resist soil erosion has predominantly concentrated on arid and semi-arid regions. Consequently, this study will specifically delve into elucidating the erosion-resistant mechanisms of biocrusts in tropical coral island environments, South China Sea. Specifically, we collected 16 samples of biocrusts and bare soil from Meiji Island. High-throughput amplicon sequencing was executed to analyze the microbial community, including bacteria, fungi, and archaea. Additionally, quantitative PCR was utilized to assess the abundance of the bacterial 16S rRNA, fungal ITS, archaeal 16S rRNA, and cyanobacterial 16S rRNA genes within these samples. Physicochemical measurements and assessments of extracellular polymeric substances (EPSs) were conducted to characterize the soil properties. The study reported a significantly decreased soil erodibility factor after biocrust formation. Compared to bare soil, soil erodibility factor decreased from 0.280 to 0.190 t h MJ−1 mm−1 in the biocrusts. Mechanistically, we measured the microbial EPS contents and revealed a negative correlation between EPS and soil erodibility factor. Consistent with increased EPS, the abundance of bacteria, fungi, archaea, and cyanobacteria were also detected significantly increased with biocrust formation. Correlation analysis detected Cyanobacteria, Chloroflexi, Deinococcota, and Crenarchaeota as potential microbials promoting EPSs and reducing soil erosion. Together, our study presents the evidence that biocrust from tropical coral island in the South China Sea promotes resistance to soil erosion, pinpointing key EPSs-producing microbials against soil erosion. The findings would provide insights for island soil restoration.

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Recovery of subtropical coastal intertidal system prokaryotes from a destruction event and the role of extracellular polymeric substances in the presence of endocrine disrupting chemicals

Cited by 10 publications

References 63 publications

Dynamics of extracellular polymeric substances and soil organic carbon with mangrove zonation along a continuous tidal gradient

Dynamics of extracellular polymeric substances and soil organic carbon with mangrove zonation along a continuous tidal gradient

Effects of wetland, tide, and season on benthic biofilms and related sediment properties in mangrove ecosystems

Biocrust reduces the soil erodibility of coral calcareous sand by regulating microbial community and extracellular polymeric substances on tropical coral island, South China Sea

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