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Zhang R, Zhuang J, Guo X, Dai T, Ye Z, Liu R, Li G, Yang Y. Microbial functional heterogeneity induced in a petroleum-polluted soil profile. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133391. [PMID: 38171203 DOI: 10.1016/j.jhazmat.2023.133391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 12/12/2023] [Accepted: 12/26/2023] [Indexed: 01/05/2024]
Abstract
Microbial taxonomic diversity declines with increasing stress caused by petroleum pollution. However, few studies have tested whether functional diversities vary similarly to taxonomic diversity along the stress gradient. Here, we investigated soil microbial communities in a petrochemically polluted site in China. Total petroleum hydrocarbon (TPH) concentrations were higher in the middle (2-3 m) and deep soil layer (3-5 m) than in the surface soil layer (0-2 m). Accordingly, microbial taxonomic α-diversity was decreased by 44% (p < 0.001) in the middle and deep soil layers, compared to the surface soil layer. In contrast, functional α-diversity decreased by 3% (p < 0.001), showing a much better buffering capacity to environmental stress. Differences in microbial taxonomic and functional β-diversities were enlarged in the middle and deep soil layers, extending the Anna Karenina Principle (AKP) that a community adapts to stressful environments in its own way. Consistent with the stress gradient hypothesis, we revealed a higher degree of network connectivity among microbial species and genes in the middle and deep soil layers compared to the surface soil layer. Together, we demonstrate that microbial functionality is more tolerant to stress than taxonomy, both of which were amenable to AKP and the stress gradient hypothesis.
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Affiliation(s)
- Ruihuan Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jugui Zhuang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Xue Guo
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Tianjiao Dai
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
| | - ZhenCheng Ye
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Rongqin Liu
- Shanghai SUS Environment Remediation Co., LTD, Shanghai 201703, China
| | - Guanghe Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
| | - Yunfeng Yang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
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Huang S, Kong Y, Chen Y, Huang X, Ma P, Liu X. Microbial denitrification characteristics of typical decentralized wastewater treatment processes based on 16S rRNA sequencing. Front Microbiol 2023; 14:1242506. [PMID: 37779708 PMCID: PMC10537219 DOI: 10.3389/fmicb.2023.1242506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 09/04/2023] [Indexed: 10/03/2023] Open
Abstract
Despite the widespread application of decentralized wastewater treatment (WWT) facilities in China, relatively few research has used the multi-media biological filter (MMBF) facilities to investigate the microorganism characteristics. This study utilizes 16S rRNA high-throughput sequencing (HTS) technology to examine the microbial biodiversity of a representative wastewater treatment (WWT) system in an expressway service area. The pathways of nitrogen removal along the treatment route were analyzed in conjunction with water quality monitoring. The distribution and composition of microbial flora in the samples were examined, and the dominant flora were identified using LEfSe analysis. The FAPROTAX methodology was employed to investigate the relative abundance of genes associated with the nitrogen cycle and to discern the presence of functional genes involved in nitrogen metabolism. On average, the method has a high level of efficiency in removing COD, TN, NH3-N, and TP from the effluent. The analysis of the microbial community identified a total of 40 phyla, 111 classes, 143 orders, 263 families, and 419 genera. The phyla that were predominantly observed include Proteobacteria, Acidobacteria, Chloroflexi, Actinobacteria, Nitrospirae, Bacteroidetes. The results show that the system has achieved high performance in nitrogen removal, the abundance of nitrification genes is significantly higher than that of other nitrogen cycle genes such as denitrification, and there are six nitrogen metabolism pathways, primarily nitrification, among which Nitrospirae and Nitrospira are the core differentiated flora that can adapt to low temperature conditions and participate in nitrification, and are the dominant nitrogen removal flora in cold regions. This work aims to comprehensively investigate the diversity and functional properties of the bacterial community in decentralized WWT processes.
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Affiliation(s)
- Shanqian Huang
- Center of Environment Protection, China Academy of Transportation Sciences, Beijing, China
| | - Yaping Kong
- Center of Environment Protection, China Academy of Transportation Sciences, Beijing, China
| | - Yao Chen
- Center of Environment Protection, China Academy of Transportation Sciences, Beijing, China
| | - Xuewen Huang
- Anhui Transportation Holding Group CO., LTD., Hefei, China
| | - Pengfei Ma
- Qinghai Expressway Maintenance Service CO., LTD., Xining, China
| | - Xuexin Liu
- Center of Environment Protection, China Academy of Transportation Sciences, Beijing, China
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3
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Cui H, Xu R, Yu Z, Meng F. Phylogenetic group-based assembly and co-occurrence pattern of the microbial community in full-scale wastewater treatment plants during the Chinese spring festival. CHEMOSPHERE 2023; 316:137775. [PMID: 36621691 DOI: 10.1016/j.chemosphere.2023.137775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 01/03/2023] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
The quality and quantity of domestic sewage discharge vary significantly during the Chinese Spring Festival due to the huge population shift. The dynamics of microbial community traits during the Spring Festival, particularly the phylogenetic group-based assembly and co-occurrence patterns, are however little understood. Here, influent and activated sludge samples from 2 full-scale wastewater treatment plants were collected bi-daily throughout a 20-day Spring Festival period and subjected to high-throughput Illumina-MiSeq sequencing. The findings revealed that the microbial communities in the activated sludge displayed a comparatively stable pattern, and that the influent communities experienced significant temporal fluctuations in terms of diversity and composition. The characterization by "Infer Community Assembly Mechanisms by Phylogenetic-bin based null model" demonstrated that for Competibacter glycogen-accumulating organisms, the assembly mechanism shifted from deterministic process (HoS = 69.5%) before the Spring Festival to stochastic process (DR = 65.9%) after the Spring Festival. The network analysis revealed that the network structure of sludge communities was more stable before the Spring Festival than that after the Spring Festival. Additionally, sludge communities had no keystone species in common with the influent before the Spring Festival, while the sludge and influent communities shared two keystone taxa after the Spring Festival (Sebaldella and Candidatus Competibacter). This study would deepen our understanding of the microbial ecology in biological wastewater treatment systems, which also aids in managing wastewater treatment plants.
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Affiliation(s)
- Hongcan Cui
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, 510275, PR China
| | - Ronghua Xu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, 510275, PR China
| | - Zhong Yu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, 510275, PR China
| | - Fangang Meng
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, 510275, PR China.
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4
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Tian L, Wang L, Zhang X, Huang X, Wang F, Zhu S, Li X, Guan Y. Multi-omics analysis on seasonal variations of the biofilm microbial community in a full-scale pre-denitrification biofilter. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:24284-24298. [PMID: 36334202 DOI: 10.1007/s11356-022-23539-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
The seasonal variations of biofilm communities in a municipal wastewater treatment plant were investigated using multi-omics techniques. The abundance of the main phyla of microorganisms varied with summer (July 2019) and winter (January 2019) samples considerably, the Bacteroidetes enriched in winter and Chloroflexi in summer. The results of metaproteomic and metagenomic showed that most of the functional microorganisms belonged to the Betaproteobacteria class, and the enrichment of Flavobacteria class in winter guaranteed the stability of denitrification performance to some extent. Seasonal variations affected the proteomic expression profiling, a total of 2835 differentially expressed proteins identified were significantly enriched in quorum sensing, two-component system, ribosome, benzoate degradation, butanoate metabolism, tricarboxylic acid cycle (TCA cycle), and cysteine and methionine metabolism pathways. With the expression of nitrogen metabolic proteins decreases in winter, the overall expression of denitrification-related enzymes in winter was much lower than that in summer, the nitrogen metabolism pathway varied significantly. Seasonal variations also induced the alteration of the biofilm metabolite profile; a total of 66 differential metabolites, 8 potential biomarkers, and 8 perturbed metabolic pathways such as TCA cycle were detected. It was found that most of the perturbed pathways are directly related to nitrogen metabolism, and several amino acids and organic acids associated with the TCA cycle were significantly perturbed, the accumulation of TCA cycle intermediates, ornithine, and L-histidine in winter might be conducive to resisting cold temperatures. Furthermore, the correlation between biofilm microbial communities and metabolites was identified by the combined analysis of metabolomic and metaproteomic. The differences of microbial community structure, function, and metabolism between winter and summer in a full-scale pre-denitrification biofilter were revealed for the first time, strengthening our understanding of the microbial ecology of biofilm communities.
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Affiliation(s)
- Lu Tian
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China
| | - Lin Wang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China.
| | - Xiaofeng Zhang
- Qingdao Water Development Service Center, Qingdao, 266071, China
| | - Xuda Huang
- Qingdao Water Development Service Center, Qingdao, 266071, China
| | - Fuhao Wang
- Qingdao Water Affairs Group, Environmental Energy Co., Ltd, Qingdao, 266075, China
| | - Sifu Zhu
- Qingdao Haibo River Water Operation Co., Ltd, Qingdao, 266021, China
| | - Xueqiang Li
- Qingdao Haibo River Water Operation Co., Ltd, Qingdao, 266021, China
| | - Ying Guan
- Qingdao Haibo River Water Operation Co., Ltd, Qingdao, 266021, China
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Wang M, Zhang W, Zhao J, Yang Z, Guo X, Ji H. Distinct structural strategies with similar functional responses of abundant and rare subcommunities regarding heavy metal pollution in the Beiyun river basin. CHEMOSPHERE 2022; 309:136659. [PMID: 36202374 DOI: 10.1016/j.chemosphere.2022.136659] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 09/26/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
Bacteria within a metacommunity could be partitioned into different subcommunities ecological assemblages in light of potential importance for the community function. It is unknown how abundant and rare microbial subcommunities in urban river sediments respond to heavy metal pollutants. Using high-throughput sequencing, we analyzed these response patterns in the heavliy polluted (Beijing, China). We found that this river faces substantial ecological risks, owing to high rates of Cd and Hg pollution from urban activities. Surprisingly, abundant and rare subcommunity structures showed opposite responses to heavy metals. Abundant taxa, such as Crenarchaeota and Euryarchaeota, are resistant to heavy metal pollution through the synergistic of ammonia nitrogen (NH4+-N) and total phosphorus (TP). By contrast, rare taxa, such as Verrucomicrobia, Fibrobacteres, Berkelbacteria, and Euryarchaeota, had a high synergy with NH4+-N and TP with high a resilience to heavy metal pollution. However, the functions of both abundant and rare subcommunities showed a similar response to heavy metal pollutants, especially in denitrification processes. The abundant taxa responded to heavy metal pollution through methanogenesis by CO2 reduction with H2, human pathogens nosocomia, sulfate respiration, photoheterotrophy, and dark sulfide oxidation synergy with NH4+-N and TP. The rare taxa responded to heavy metals through methanogenesis by CO2 reduction with H2, cellulolysis, sulfate respiration, intracellular parasites, nitrate reduction and plant pathogen. We observed distinct patterns between the structural and functional responses of microbial subcommunities to heavy metal pollutants. Our findings support the concept that denitrification processes are sensitive to but not inhibited by high levels of heavy metals pollution. We propose that the structures and functions of the abundant and rare microbial subcommunities could inform the management of pollutants in heavily polluted urban river ecosystems at fine geographical scales.
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Affiliation(s)
- Min Wang
- College of Resources Environment and Tourism, Capital Normal University, Beijing, China
| | - Wei Zhang
- College of Resources Environment and Tourism, Capital Normal University, Beijing, China
| | - Junying Zhao
- College of Resources Environment and Tourism, Capital Normal University, Beijing, China
| | - Zirou Yang
- College of Resources Environment and Tourism, Capital Normal University, Beijing, China
| | - Xiaoyu Guo
- College of Resources Environment and Tourism, Capital Normal University, Beijing, China.
| | - Hongbing Ji
- College of Resources Environment and Tourism, Capital Normal University, Beijing, China; School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, China.
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Correa-Galeote D, Argiz L, Mosquera-Corral A, Del Rio AV, Juárez-Jiménez B, González-López J, Rodelas B. Structure of fungal communities in sequencing batch reactors operated at different salinities for the selection of triacylglyceride-producers from a fish-canning lipid-rich waste stream. N Biotechnol 2022; 71:47-55. [PMID: 35931375 DOI: 10.1016/j.nbt.2022.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 07/30/2022] [Accepted: 08/01/2022] [Indexed: 12/01/2022]
Abstract
Oleaginous fungi natively accumulate large amounts of triacylglycerides (TAG), widely used as precursors for sustainable biodiesel production. However, little attention has been paid to the diversity and roles of fungal mixed microbial cultures (MMCs) in sequencing batch reactors (SBR). In this study, a lipid-rich stream produced in the fish-canning industry was used as a substrate in two laboratory-scale SBRs operated under the feast/famine (F/F) regime to enrich microorganisms with high TAG-storage ability, under two different concentrations of NaCl (SBR-N: 0.5g/L; SBR-S: 10g/L). The size of the fungal community in the enriched activated sludge (EAS) was analyzed using 18S rRNA-based qPCR, and the fungal community structure was determined by Illumina sequencing. The different selective pressures (feeding strategy and control of pH) implemented in the enrichment SBRs throughout operation increased the abundance of total fungi. In general, there was an enrichment of genera previously identified as TAG-accumulating fungi (Apiotrichum, Candida, Cutaneotrichosporon, Geotrichum, Haglerozyma, Metarhizium, Mortierella, Saccharomycopsis, and Yarrowia) in both SBRs. However, the observed increase of their relative abundances throughout operation was not significantly linked to a higher TAG accumulation.
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Affiliation(s)
- David Correa-Galeote
- Microbiology Department, Faculty of Pharmacy, University of Granada, 18001 Granada, Andalucía, Spain; Microbiology and Environmental technology section, Microbiology Department, Faculty of Pharmacy, University of Granada, 18011 Granada, Andalucía, Spain.
| | - Lucía Argiz
- CRETUS Institute, Department of Chemical Engineering, University of Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
| | - Anuska Mosquera-Corral
- CRETUS Institute, Department of Chemical Engineering, University of Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
| | - Angeles Val Del Rio
- CRETUS Institute, Department of Chemical Engineering, University of Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
| | - Belen Juárez-Jiménez
- Microbiology Department, Faculty of Pharmacy, University of Granada, 18001 Granada, Andalucía, Spain; Microbiology and Environmental technology section, Microbiology Department, Faculty of Pharmacy, University of Granada, 18011 Granada, Andalucía, Spain
| | - Jesús González-López
- Microbiology Department, Faculty of Pharmacy, University of Granada, 18001 Granada, Andalucía, Spain; Microbiology and Environmental technology section, Microbiology Department, Faculty of Pharmacy, University of Granada, 18011 Granada, Andalucía, Spain
| | - Belen Rodelas
- Microbiology Department, Faculty of Pharmacy, University of Granada, 18001 Granada, Andalucía, Spain; Microbiology and Environmental technology section, Microbiology Department, Faculty of Pharmacy, University of Granada, 18011 Granada, Andalucía, Spain
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Buratti S, Girometta CE, Baiguera RM, Barucco B, Bernardi M, De Girolamo G, Malgaretti M, Oliva D, Picco AM, Savino E. Fungal Diversity in Two Wastewater Treatment Plants in North Italy. Microorganisms 2022; 10:microorganisms10061096. [PMID: 35744613 PMCID: PMC9229248 DOI: 10.3390/microorganisms10061096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/20/2022] [Accepted: 05/23/2022] [Indexed: 02/01/2023] Open
Abstract
In urban wastewater treatment plants, bacteria lead the biological component of the depuration process, but the microbial community is also rich in fungi (mainly molds, yeasts and pseudo-yeasts), whose taxonomical diversity and relative frequency depend on several factors, e.g., quality of wastewater input, climate, seasonality, and depuration stage. By joining morphological and molecular identification, we investigated the fungal diversity in two different plants for the urban wastewater treatment in the suburbs of the two major cities in Lombardia, the core of industrial and commercial activities in Italy. This study presents a comparison of the fungal diversity across the depuration stages by applying the concepts of α-, β- and ζ-diversity. Eurotiales (mainly with Aspergillus and Penicillium), Trichosporonales (Trichosporon sensu lato), Saccharomycetales (mainly with Geotrichum) and Hypocreales (mainly with Fusarium and Trichoderma) are the most represented fungal orders and genera in all the stages and both the plants. The two plants show different trends in α-, β- and ζ-diversity, despite the fact that they all share a crash during the secondary sedimentation and turnover across the depuration stages. This study provides an insight on which taxa potentially contribute to each depuration stage and/or keep viable propagules in sludges after the collection from the external environment.
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Affiliation(s)
- Simone Buratti
- Department of Earth and Environmental Sciences, University of Pavia, Via Sant’Epifanio 14, 27100 Pavia, Italy; (S.B.); (R.M.B.); (A.M.P.); (E.S.)
| | - Carolina Elena Girometta
- Department of Earth and Environmental Sciences, University of Pavia, Via Sant’Epifanio 14, 27100 Pavia, Italy; (S.B.); (R.M.B.); (A.M.P.); (E.S.)
- Correspondence:
| | - Rebecca Michela Baiguera
- Department of Earth and Environmental Sciences, University of Pavia, Via Sant’Epifanio 14, 27100 Pavia, Italy; (S.B.); (R.M.B.); (A.M.P.); (E.S.)
| | - Barbara Barucco
- A2A Ciclo Idrico, Via Lamarmora 230, 25124 Brescia, Italy; (B.B.); (G.D.G.); (M.M.)
| | - Marco Bernardi
- CAP Holding Spa, Centro Ricerche Salazzurra, Via Circonvallazione Est, 20054 Segrate, Italy; (M.B.); (D.O.)
| | - Giuseppe De Girolamo
- A2A Ciclo Idrico, Via Lamarmora 230, 25124 Brescia, Italy; (B.B.); (G.D.G.); (M.M.)
| | - Maura Malgaretti
- A2A Ciclo Idrico, Via Lamarmora 230, 25124 Brescia, Italy; (B.B.); (G.D.G.); (M.M.)
| | - Desdemona Oliva
- CAP Holding Spa, Centro Ricerche Salazzurra, Via Circonvallazione Est, 20054 Segrate, Italy; (M.B.); (D.O.)
| | - Anna Maria Picco
- Department of Earth and Environmental Sciences, University of Pavia, Via Sant’Epifanio 14, 27100 Pavia, Italy; (S.B.); (R.M.B.); (A.M.P.); (E.S.)
| | - Elena Savino
- Department of Earth and Environmental Sciences, University of Pavia, Via Sant’Epifanio 14, 27100 Pavia, Italy; (S.B.); (R.M.B.); (A.M.P.); (E.S.)
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Zhang S, Zhang L, Chen P, Rong H, Li S. Deciphering the microbial patterns of anammox process under hexavalent chromium stress: Abundant and rare subcommunity respond differently. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125850. [PMID: 34492801 DOI: 10.1016/j.jhazmat.2021.125850] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/14/2021] [Accepted: 04/06/2021] [Indexed: 06/13/2023]
Abstract
This study aims to unravel the microbial responses to Cr(VI) stress in anaerobic ammonium oxidation (anammox) reactor. The result showed that anammox process could tolerate 2 mg/L Cr(VI) after acclimation, while 5 mg/L Cr(VI) stress resulted in significant inhibition on anammox bacterial activity. Ca. Jettenia was the predominant anammox genus, whose abundance showed a decreasing tendency with increasing Cr(VI) dosage. Cr(VI) addition resulted in significant and irreversible changes in microbial community structure, and increased the relative influence of stochastic processes on community assembly. Furthermore, rare subcommunity contributed greatly to biodiversity of whole community (90.35%), while abundant subcommunity were more similar to the whole community. Importantly, Cr(VI) exposure caused greater variations in rare subcommunity compared with abundant one, indicating that rare taxa were more sensitive to Cr(VI) stress. This was further confirmed by ABT model, which showed higher relative influence of Cr(VI) on rare subcommunity. In addition, results suggested that rare taxa play essential roles in whole community stability, because of their great contribution to species richness and community variations, and keystone roles in ecosystem network. Moreover, network analysis showed that conditionally rare taxa frequently and positively interacted with abundant taxa, which may contribute to the community resilience to Cr(VI) stress.
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Affiliation(s)
- Shaoqing Zhang
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Liqiu Zhang
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China; Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, PR China
| | - Peng Chen
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Hongwei Rong
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China; Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, PR China.
| | - Shugeng Li
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, PR China; School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, PR China.
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