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  1. Article ; Online: Analysis of diversity and function of epiphytic bacterial communities associated with macrophytes using a metagenomic approach.

    Wang, Xin / Liu, Yi / Qing, Chun / Zeng, Jin / Dong, Jixing / Xia, Pinhua

    Microbial ecology

    2024  Volume 87, Issue 1, Page(s) 37

    Abstract: Epiphytic bacteria constitute a vital component of aquatic ecosystems, pivotal in regulating elemental cycling. Despite their significance, the diversity and functions of epiphytic bacterial communities adhering to various submerged macrophytes remain ... ...

    Abstract Epiphytic bacteria constitute a vital component of aquatic ecosystems, pivotal in regulating elemental cycling. Despite their significance, the diversity and functions of epiphytic bacterial communities adhering to various submerged macrophytes remain largely unexplored. In this study, we employed a metagenomic approach to investigate the diversity and function of epiphytic bacterial communities associated with six submerged macrophytes: Ceratophyllum demersum, Hydrilla verticillata, Myriophyllum verticillatum, Potamogeton lucens, Stuckenia pectinata, and Najas marina. The results revealed that the predominant epiphytic bacterial species for each plant type included Pseudomonas spp., Microbacterium spp., and Stenotrophomonas rhizophila. Multiple comparisons and linear discriminant analysis effect size indicated a significant divergence in the community composition of epiphytic bacteria among the six submerged macrophytes, with 0.3-1% of species uniquely identified. Epiphytic bacterial richness associated with S. pectinata significantly differed from that of both C. demersum and H. verticillata, although no significant differences were observed in diversity and evenness. Functionally, notable variations were observed in the relative abundances of genes associated with carbon, nitrogen, and phosphorus cycling within epiphytic bacterial communities on the submerged macrophyte hosts. Among these communities, H. verticillata exhibited enrichment in genes related to the 3-hydroxypropionate bicycle and nitrogen assimilation, translocation, and denitrification. Conversely, M. verticillatum showcased enrichment in genes linked to the reductive citric acid cycle (Arnon-Buchanan cycle), reductive pentose phosphate cycle (Calvin cycle), polyphosphate degradation, and organic nitrogen metabolism. In summary, our findings offer valuable insights into the diversity and function of epiphytic bacteria on submerged macrophyte leaves, shedding light on their roles in lake ecosystems.
    MeSH term(s) Ecosystem ; Lakes ; Metagenome ; Bacteria/genetics ; Bacteria/metabolism ; Potamogetonaceae/genetics ; Potamogetonaceae/microbiology ; Nitrogen/metabolism
    Chemical Substances Nitrogen (N762921K75)
    Language English
    Publishing date 2024-01-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1462065-0
    ISSN 1432-184X ; 0095-3628
    ISSN (online) 1432-184X
    ISSN 0095-3628
    DOI 10.1007/s00248-024-02346-7
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  2. Article: Loss of submerged macrophytes in shallow lakes alters bacterial and archaeal community structures, and reduces their co-occurrence networks connectivity and complexity.

    Liu, Jiahui / Huang, Xianfei / Jiang, Xin / Qing, Chun / Li, Yue / Xia, Pinhua

    Frontiers in microbiology

    2024  Volume 15, Page(s) 1380805

    Abstract: Introduction: Bacteria and archaea are important components in shallow lake ecosystems and are crucial for biogeochemical cycling. While the submerged macrophyte loss is widespread in shallow lakes, the effect on the bacteria and archaea in the sediment ...

    Abstract Introduction: Bacteria and archaea are important components in shallow lake ecosystems and are crucial for biogeochemical cycling. While the submerged macrophyte loss is widespread in shallow lakes, the effect on the bacteria and archaea in the sediment and water is not yet widely understood.
    Methods: In this study, 16S rRNA gene sequencing was used to explore the bacteria and archaea in samples taken from the sediment and water in the submerged macrophyte abundant (MA) and submerged macrophyte loss (ML) areas of Caohai Lake, Guizhou, China.
    Results: The results showed that the dominant bacterial phyla were
    Discussion: This study assesses the impacts of submerged macrophyte loss on bacteria and archaea in lakes from microbial perspective, which can help to provide further theoretical basis for microbiological research and submerged macrophytes restoration in shallow lakes.
    Language English
    Publishing date 2024-03-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2024.1380805
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  3. Article ; Online: Temporal Succession of Bacterial Community Structure, Co-occurrence Patterns, and Community Assembly Process in Epiphytic Biofilms of Submerged Plants in a Plateau Lake

    Shi, Lei / Xia, Pinhua / Lin, Tao / Li, Guoqing / Wang, Tianyou / Du, Xin

    Microb Ecol. 2023 Jan., v. 85, no. 1 p.87-99

    2023  

    Abstract: In shallow macrophytic lakes, epiphytic biofilms are formed on the surface of submerged plant stems and leaves because of algae and bacterial accumulation. Epiphytic biofilms significantly impact the health of the host vegetation and the biogeochemical ... ...

    Abstract In shallow macrophytic lakes, epiphytic biofilms are formed on the surface of submerged plant stems and leaves because of algae and bacterial accumulation. Epiphytic biofilms significantly impact the health of the host vegetation and the biogeochemical cycling of lake elements. However, community diversity, species interactions, and community assembly mechanisms in epiphytic bacterial communities (EBCs) of plants during different growth periods are not well understood. We investigated the successional dynamics, co-occurrence patterns, and community assembly processes of epiphytic biofilm bacterial communities of submerged plants, Najas marina and Potamogeton lucens, from July to November 2020. The results showed a significant seasonal variation in EBC diversity and richness. Community diversity and richness increased from July to November, and the temperature was the most important driving factor for predicting seasonal changes in EBC community structure. Co-occurrence network analysis revealed that the average degree and graph density of the network increased from July to November, indicating that the complexity of the EBC network increased. The bacterial community co-occurrence network was limited by temperature, pH, and transparency. The phylogeny-based null model analysis showed that deterministic processes dominated the microbial community assembly in different periods, increasing their contribution. In addition, we found that as the dominance of deterministic processes increased, the microbial co-occurrence links increased, and the potential interrelationships between species became stronger. Thus, the findings provide insights into the seasonal variability of EBC assemblage and co-occurrence patterns in lacustrine ecosystems.
    Keywords Najas marina ; Potamogeton lucens ; bacterial communities ; biofilm ; community structure ; epiphytes ; lakes ; pH ; seasonal variation ; submerged aquatic plants ; temperature ; vegetation
    Language English
    Dates of publication 2023-01
    Size p. 87-99.
    Publishing place Springer US
    Document type Article ; Online
    ZDB-ID 1462065-0
    ISSN 1432-184X ; 0095-3628
    ISSN (online) 1432-184X
    ISSN 0095-3628
    DOI 10.1007/s00248-021-01956-9
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  4. Article: Shifts of sediment bacterial community and respiration along a successional gradient in a typical karst plateau lake wetland (China)

    Xia, Pinhua / Zhang, Jian / Liu, Jinbo / Yu, Lifei

    Journal of oceanology and limnology. 2021 May, v. 39, no. 3

    2021  

    Abstract: Bacteria are important regulators of carbon cycling in lakes and are central to sediment ecosystem processes. However, the sediment microbial communities and their respiratory responses to the lake wetland succession are poorly understood. In this study, ...

    Abstract Bacteria are important regulators of carbon cycling in lakes and are central to sediment ecosystem processes. However, the sediment microbial communities and their respiratory responses to the lake wetland succession are poorly understood. In this study, we collected sediment samples from four different succession points (the Potamogeton lucens zone, the Scirpus tabernaemontani zone, the Scirpus triqueter zone, and the Juncus effusus zone) in the Caohai Wetland of the Guizhou Plateau (China). The bacterial communities at these succession points were studied using a high-throughput sequencing approach. The sediment microbial respiration (SR) was measured using static chambers in the field and basal respiration (BR) was determined in the laboratory. The results show that the dominant bacterial taxa in the sediment was Proteobacteria (34.7%), Chloroflexi (17.8%), Bacteroidetes (7.3%), Acidobacteria (6.6%), and Cyanobacteria (6.1%). Principal coordinate analysis showed that the microbial community structure differs significantly at different sampling points along the successional gradient, indicating that the bacterial community structure is sensitive to the lake wetland succession. Different hydrological regimes and soil characteristics such as [Formula: see text], Fe²⁺, Mn²⁺, and sediment organic carbon (SOC) content may be important factors responsible for the differences in the sediment microbial characteristics of the different successional stages in the Caohai wetland. Additionally, it was found that the SR increased significantly from the P. lucens zone to the J. effusus zone, but BR had the opposite response. The shifts in the bacterial community structure along the successional gradient may be the main reason for the observed differences in sediment respiration.
    Keywords Acidobacteria ; Bacteroidetes ; Chloroflexi ; Cyanobacteria ; Juncus effusus ; Potamogeton lucens ; Proteobacteria ; Schoenoplectus tabernaemontani ; Schoenoplectus triqueter ; bacterial communities ; community structure ; ecosystems ; hydrology ; karsts ; lakes ; limnology ; multidimensional scaling ; oceanography ; organic carbon ; sediments ; wetlands ; China
    Language English
    Dates of publication 2021-05
    Size p. 880-891.
    Publishing place Science Press
    Document type Article
    ISSN 2096-5508
    DOI 10.1007/s00343-020-0073-y
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Assessment of heavy metal pollution and exposure risk for migratory birds- A case study of Caohai wetland in Guizhou Plateau (China)

    Xia, Pinhua / Ma, Li / Yi, Yin / Lin, Tao

    Environmental pollution. 2021 Apr. 15, v. 275

    2021  

    Abstract: Increasing heavy metal pollution in wetland ecosystems around the world pose significant health risks to waterbirds, especially the endangered species. We analyzed heavy metal pollution in bird foraging area of Caohai wetland in Guizhou Plateau (China), ... ...

    Abstract Increasing heavy metal pollution in wetland ecosystems around the world pose significant health risks to waterbirds, especially the endangered species. We analyzed heavy metal pollution in bird foraging area of Caohai wetland in Guizhou Plateau (China), and used an integrated exposure risk model for assessing heavy metal (Cd, Pb, Cr, Ni, Zn, Sb) exposure risk in birds from the soil, water, plants and benthic invertebrates. There is considerable variation in the extent of heavy metal contamination across the different sampling sites, and Cd and Sb are the main contaminants. The mussel Anodonta showed greater heavy metal accumulation (except for Zn) compared to the snail species C. cathayensis. The different plant species also varied in terms of amount for accumulated heavy metals. The phytophagous together with omnivorous birds were exposed to Cd, Pb, Zn and Ni through plants rather than the soil, whereas the maximum Zn exposure in the omnivorous and carnivorous birds was through consumption of benthic invertebrates. Furthermore, the phytophagous black-necked cranes (Grus nigricollis) were less risk to heavy metal exposure compared to the omnivorous bar-headed goose (Anser indicus) and carnivorous ruddy shelducks (Tadorna ferruginea). The exposure risk of Cr (8.1) was highest, followed by Pb (5.1), Zn (3.8), Sb (1.0), Cd (0.33) and Ni (0.28). The heavy metal assessment heavy metal exposure risk for migratory birds should take into account the exposure from food and soil. Our findings provide new insights into developing measures to minimize heavy metal contamination in migratory birds.
    Keywords Anodonta ; Anser indicus ; Grus nigricollis ; Tadorna ferruginea ; carnivores ; case studies ; endangered species ; heavy metals ; migratory behavior ; models ; mussels ; omnivores ; pollution ; risk ; snails ; soil ; water birds ; wetlands ; China
    Language English
    Dates of publication 2021-0415
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 280652-6
    ISSN 1873-6424 ; 0013-9327 ; 0269-7491
    ISSN (online) 1873-6424
    ISSN 0013-9327 ; 0269-7491
    DOI 10.1016/j.envpol.2021.116564
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  6. Article ; Online: Assessment of heavy metal pollution and exposure risk for migratory birds- A case study of Caohai wetland in Guizhou Plateau (China).

    Xia, Pinhua / Ma, Li / Yi, Yin / Lin, Tao

    Environmental pollution (Barking, Essex : 1987)

    2021  Volume 275, Page(s) 116564

    Abstract: Increasing heavy metal pollution in wetland ecosystems around the world pose significant health risks to waterbirds, especially the endangered species. We analyzed heavy metal pollution in bird foraging area of Caohai wetland in Guizhou Plateau (China), ... ...

    Abstract Increasing heavy metal pollution in wetland ecosystems around the world pose significant health risks to waterbirds, especially the endangered species. We analyzed heavy metal pollution in bird foraging area of Caohai wetland in Guizhou Plateau (China), and used an integrated exposure risk model for assessing heavy metal (Cd, Pb, Cr, Ni, Zn, Sb) exposure risk in birds from the soil, water, plants and benthic invertebrates. There is considerable variation in the extent of heavy metal contamination across the different sampling sites, and Cd and Sb are the main contaminants. The mussel Anodonta showed greater heavy metal accumulation (except for Zn) compared to the snail species C. cathayensis. The different plant species also varied in terms of amount for accumulated heavy metals. The phytophagous together with omnivorous birds were exposed to Cd, Pb, Zn and Ni through plants rather than the soil, whereas the maximum Zn exposure in the omnivorous and carnivorous birds was through consumption of benthic invertebrates. Furthermore, the phytophagous black-necked cranes (Grus nigricollis) were less risk to heavy metal exposure compared to the omnivorous bar-headed goose (Anser indicus) and carnivorous ruddy shelducks (Tadorna ferruginea). The exposure risk of Cr (8.1) was highest, followed by Pb (5.1), Zn (3.8), Sb (1.0), Cd (0.33) and Ni (0.28). The heavy metal assessment heavy metal exposure risk for migratory birds should take into account the exposure from food and soil. Our findings provide new insights into developing measures to minimize heavy metal contamination in migratory birds.
    MeSH term(s) Animals ; Birds ; China ; Ecosystem ; Environmental Monitoring ; Metals, Heavy/analysis ; Risk Assessment ; Soil ; Soil Pollutants/analysis ; Wetlands
    Chemical Substances Metals, Heavy ; Soil ; Soil Pollutants
    Language English
    Publishing date 2021-02-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 280652-6
    ISSN 1873-6424 ; 0013-9327 ; 0269-7491
    ISSN (online) 1873-6424
    ISSN 0013-9327 ; 0269-7491
    DOI 10.1016/j.envpol.2021.116564
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  7. Article ; Online: Photocatalytic degradation of tetracycline hydrochloride by a Fe3O4/g-C3N4/rGO magnetic nanocomposite mechanism: modeling and optimization

    Shan, Junyue / Wu, Xianliang / Li, Caifang / Hu, Jiwei / Zhang, Zhenming / Liu, Huijuan / Xia, Pinhua / Huang, Xianfei

    Environ Sci Pollut Res. 2023 Jan., v. 30, no. 3 p.8098-8109

    2023  

    Abstract: The photocatalytic degradation of antibiotics requires a good separation efficiency of photogenerated electron–hole pairs and a wide visible light absorption range. Current studies have discussed the successful preparation of ferroferric oxide/graphite ... ...

    Abstract The photocatalytic degradation of antibiotics requires a good separation efficiency of photogenerated electron–hole pairs and a wide visible light absorption range. Current studies have discussed the successful preparation of ferroferric oxide/graphite carbon nitride/reduced graphene oxide (Fe₃O₄/g-C₃N₄/rGO). The phase structure and morphology of the Fe₃O₄/g-C₃N₄/rGO composites were characterized by XRD, HR-TEM, SEM, and EDS. The obtained composites were used to degrade tetracycline hydrochloride (TCH) to evaluate its photocatalytic activity. The effects of four variables on the degradation of TCH were analyzed by the response surface method and artificial intelligence (gradient regression tree, random forest, artificial neural network, etc.). The results showed that the graphite carbon nitride in the catalyst maintained its original structure and that the photocatalytic activity was significantly improved. The degradation rate of TCH was 86.7% under the optimal conditions (the Fe₃O₄/g-C₃N₄/rGO dosage was 0.1 g, pH = 7.0, the initial concentration of TCH was 20 mg/L, and the visible light irradiation time was 60 min). At the same time, the degradation rate of TCH changed little after the material was used five times, which indicates that the stability and recyclability of the Fe₃O₄/g-C₃N₄/rGO photocatalyst were excellent. Finally, a possible photocatalytic mechanism of the Fe₃O₄/g-C₃N₄/rGO photocatalyst is proposed in this paper.
    Keywords absorption ; artificial intelligence ; carbon nitride ; graphene ; graphene oxide ; irradiation ; light ; magnetism ; nanocomposites ; neural networks ; pH ; photocatalysis ; photocatalysts ; regression analysis ; response surface methodology ; tetracycline
    Language English
    Dates of publication 2023-01
    Size p. 8098-8109.
    Publishing place Springer Berlin Heidelberg
    Document type Article ; Online
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-022-22770-x
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  8. Article: Community structure and assembly of denitrifying bacteria in epiphytic biofilms in a freshwater lake ecosystem

    Li, Guoqing / Yan, Dingbo / Xia, Pinhua / Cao, Haipeng / Lin, Tao / Yi, Yin

    Journal of oceanology and limnology. 2022 May, v. 40, no. 3

    2022  

    Abstract: Denitrifying bacteria are a crucial component of aquatic ecosystem in nitrogen cycle. However, the denitrifying bacterial community dynamics and structure in epiphytic biofilms remain unexplored. The abundance of denitrification gene (nir) and structure ... ...

    Abstract Denitrifying bacteria are a crucial component of aquatic ecosystem in nitrogen cycle. However, the denitrifying bacterial community dynamics and structure in epiphytic biofilms remain unexplored. The abundance of denitrification gene (nir) and structure of nirS-denitrifying bacterial community in the epiphytic biofilms collected in July and November of 2018 from a typical plateau lake (Caohai Wetland, Guizhou, China) were studied by Real-time Quantitative Polymerase Chain Reaction (qPCR) and high-throughput sequencing. Results show that the gene abundance of nirK was higher than that of nirS (P<0.05), and it was significantly different during the growth period (July) than the decline period (November). The denitrifying bacterial species was similar in the two months and shared 76.18% of OTUs. Proteobacteria (56.55%±22.15%) was the dominant phylum in all the samples. Epiphytic biofilms between growth period and decline period displayed significantly different microbial community structures due to differences in species abundance. Water temperature was the crucial factor that affected the denitrifying microbial community structure in our study. Environmental factors explain only partially the dynamic characteristics of denitrifying microbial communities, implying that the stochastic processes affected the construction of denitrifying microbial communities. As the null model analysis results show, dispersal limitation (stochastic) and undominated processes significantly influenced the assembly of denitrifying microbial communities. This study broadened our understanding of the denitrifying bacterial community structure and its function on epiphytic biofilms in freshwater ecosystems with new information provided.
    Keywords Proteobacteria ; bacterial communities ; biofilm ; community structure ; decline ; denitrification ; epiphytes ; freshwater ; freshwater lakes ; genes ; limnology ; nitrogen cycle ; oceanography ; quantitative polymerase chain reaction ; species abundance ; water temperature ; wetlands ; China
    Language English
    Dates of publication 2022-05
    Size p. 1039-1050.
    Publishing place Science Press
    Document type Article
    ISSN 2096-5508
    DOI 10.1007/s00343-021-1084-z
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  9. Article: Prokaryotic Community Succession in Bulk and Rhizosphere Soils Along a High-Elevation Glacier Retreat Chronosequence on the Tibetan Plateau.

    Liu, Jinbo / Kong, Weidong / Xia, Pinhua / Zhu, Chunmao / Li, Xiangzhen

    Frontiers in microbiology

    2021  Volume 12, Page(s) 736407

    Abstract: Early colonization and succession of soil microbial communities are essential for soil development and nutrient accumulation. Herein we focused on the changes in pioneer prokaryotic communities in rhizosphere and bulk soils along the high-elevation ... ...

    Abstract Early colonization and succession of soil microbial communities are essential for soil development and nutrient accumulation. Herein we focused on the changes in pioneer prokaryotic communities in rhizosphere and bulk soils along the high-elevation glacier retreat chronosequence, the northern Himalayas, Tibetan Plateau. Rhizosphere soils showed substantially higher levels of total organic carbon, total nitrogen, ammonium, and nitrate than bulk soils. The dominant prokaryotes were Proteobacteria, Actinobacteria, Acidobacteria, Chloroflexi, Crenarchaeota, Bacteroidetes, and Planctomycetes, which totally accounted for more than 75% in relative abundance. The dominant genus
    Language English
    Publishing date 2021-10-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2021.736407
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  10. Article ; Online: Temporal Succession of Bacterial Community Structure, Co-occurrence Patterns, and Community Assembly Process in Epiphytic Biofilms of Submerged Plants in a Plateau Lake.

    Shi, Lei / Xia, Pinhua / Lin, Tao / Li, Guoqing / Wang, Tianyou / Du, Xin

    Microbial ecology

    2022  Volume 85, Issue 1, Page(s) 87–99

    Abstract: In shallow macrophytic lakes, epiphytic biofilms are formed on the surface of submerged plant stems and leaves because of algae and bacterial accumulation. Epiphytic biofilms significantly impact the health of the host vegetation and the biogeochemical ... ...

    Abstract In shallow macrophytic lakes, epiphytic biofilms are formed on the surface of submerged plant stems and leaves because of algae and bacterial accumulation. Epiphytic biofilms significantly impact the health of the host vegetation and the biogeochemical cycling of lake elements. However, community diversity, species interactions, and community assembly mechanisms in epiphytic bacterial communities (EBCs) of plants during different growth periods are not well understood. We investigated the successional dynamics, co-occurrence patterns, and community assembly processes of epiphytic biofilm bacterial communities of submerged plants, Najas marina and Potamogeton lucens, from July to November 2020. The results showed a significant seasonal variation in EBC diversity and richness. Community diversity and richness increased from July to November, and the temperature was the most important driving factor for predicting seasonal changes in EBC community structure. Co-occurrence network analysis revealed that the average degree and graph density of the network increased from July to November, indicating that the complexity of the EBC network increased. The bacterial community co-occurrence network was limited by temperature, pH, and transparency. The phylogeny-based null model analysis showed that deterministic processes dominated the microbial community assembly in different periods, increasing their contribution. In addition, we found that as the dominance of deterministic processes increased, the microbial co-occurrence links increased, and the potential interrelationships between species became stronger. Thus, the findings provide insights into the seasonal variability of EBC assemblage and co-occurrence patterns in lacustrine ecosystems.
    MeSH term(s) Lakes/microbiology ; Biofilms ; Microbiota ; Seasons
    Language English
    Publishing date 2022-01-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1462065-0
    ISSN 1432-184X ; 0095-3628
    ISSN (online) 1432-184X
    ISSN 0095-3628
    DOI 10.1007/s00248-021-01956-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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