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Zhang Y, Wang M, Zhou X, Cheng W, Ren J, Wan T, Liu X. Transmission mechanism of antibiotic resistance genes and their differences between water and sediment in the Weihe River Basin. ENVIRONMENTAL RESEARCH 2024; 252:119057. [PMID: 38705450 DOI: 10.1016/j.envres.2024.119057] [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: 02/19/2024] [Revised: 04/12/2024] [Accepted: 04/30/2024] [Indexed: 05/07/2024]
Abstract
Antibiotic resistance genes (ARGs) are emerging microbial pollutants that are regulated by many factors and pose potential threats to aquatic environments. In this study, we used network analysis, correlation analysis, and constructed models based on metagenomic sequencing results to explore the spatial patterns, impact mechanisms, transmission risks and differences in ARGs in the water and sediment of the Weihe River Basin. The findings revealed notable disparities in ARGs, mobile genetic elements (MGEs), and bacterial communities. In the sediment, the abundance of ARGs was considerably greater than that in water. Moreover, the percentage of ARGs shared by the two components reached a value of 85.8%. Through network analysis, it was determined that the presence of 16 MGEs and 20 bacterial phyla was strongly associated with ARGs (R2 > 0.7, P < 0.05). The Mantel test showed that abiotic factors including DO, pH, nutrients, and heavy metals played important roles in the distribution of ARGs (P < 0.05). A structural equation model revealed that the key factors influencing the distribution of ARGs in water were bacterial diversity and environmental parameters (standardized effects of -0.730 and -0.667), and those in sediment were bacterial diversity and MGEs (standardized effects of -0.751 and 0.851). Neutral modeling indicated that deterministic processes played an important role in the assembly of ARGs in the water of the Weihe River Basin, and stochastic processes were dominant in the sediment. There was a highly significant positive linear correlation between ARGs and pathogens, and there was more complex co-occurrence in the water than in the sediment (R2 > 0.9, P < 0.05), with stronger migration and transmission occurring. Exploring ARGs in large-scale watersheds is immensely important for elucidating their traits and transmission mechanisms and consequently paving the way for the formulation of efficient strategies to mitigate resistance threats.
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Affiliation(s)
- Yutong Zhang
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, China; Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, China
| | - Min Wang
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, China; Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, China.
| | - Xiaoping Zhou
- Power China Northwest Engineering Corporation Limited, Xi'an, Shaanxi, China
| | - Wen Cheng
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, China; Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, China.
| | - Jiehui Ren
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, China; Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, China
| | - Tian Wan
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, China; Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, China
| | - Xiaoyan Liu
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, China; Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, China
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Zhou Y, Cheng L, Lian Y, Feng J, Zhou M, Jing D, Yin W, Wang H, Liu L. High-proportions of tailwater discharge alter microbial community composition and assembly in receiving sediments. Sci Rep 2024; 14:14171. [PMID: 38898074 PMCID: PMC11187100 DOI: 10.1038/s41598-024-63859-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Accepted: 06/03/2024] [Indexed: 06/21/2024] Open
Abstract
The tailwater from wastewater treatment plants serves as an important water resource in arid regions, alleviating the conflict between supply and demand. However, the effects of different tailwater discharge proportions on microbial community dynamics remain unclear. In this study, we investigated the effects of different tailwater discharge proportions on the water quality and microbial community characteristics of sediments in receiving water bodies under controlled conditions (WF-1, WF-2, WF-3, WF-4, and WF-5, containing 0% tailwater + 100% natural water, 25% tailwater + 75% natural water, 50% tailwater + 50% natural water, 75% tailwater + 25% natural water, and 100% tailwater + 0% natural water, respectively). Microbial co-occurrence networks and structural equation model were used to unveil the relationship between microbial communities and their shaping factors. Results showed that distinct microbial community compositions were found in the sediments with low- (< 50%) and high- (> 50%) proportions of tailwater. Specifically, WCHB1-41 and g_4-29-1, which are involved in organic degradation-related functions, were the key genera in the high-proportion cluster. A total of 21 taxa were more abundant in the low-proportion (< 50%) cluster than that in high-proportion (> 50%). Moreover, higher modularity was observed in the low-proportion. Total phosphorus directly affected while ammonia nitrogen indirectly affected the microbial community structure. Our findings support the distinct heterogeneity of microbial communities driven by tailwater discharge in receiving water bodies, and further confirmed that high-proportion tailwater depletes sensitive microbial communities, which may be avoided through scientific management.
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Affiliation(s)
- Yaqian Zhou
- Beijing Institute of Economics and Management, Beijing, 100102, China
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR, China
| | - Li Cheng
- China University of Geosciences (Beijing), Beijing, 100083, PR China
| | - Ying Lian
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR, China
| | - Jiaying Feng
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR, China
| | - Mengling Zhou
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR, China
| | - Dan Jing
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR, China
| | - Weiwen Yin
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR, China
| | - Heli Wang
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR, China.
- Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Suzhou, 215009, Jiangsu, China.
| | - Lei Liu
- Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Chinese Academy of Forestry, Research Institute of Forestry, Beijing, 100091, China.
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Jiang Y, Ma D, Wang J, Xu Q, Fang J, Yue Z. Regulatory of salinity on assembly of activated sludge microbial communities and nitrogen transformation potential in industrial plants of the lower Yangtze River basin. ENVIRONMENTAL RESEARCH 2024; 251:118769. [PMID: 38518918 DOI: 10.1016/j.envres.2024.118769] [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: 12/14/2023] [Revised: 03/18/2024] [Accepted: 03/19/2024] [Indexed: 03/24/2024]
Abstract
This study aims to thoroughly investigate the impact mode of salinity carried by industrial wastewater on the anaerobic-anoxic-oxic (A2O) sludge in wastewater treatment plants (WWTPs). Through comprehensive investigation of the A2O stage activated sludge (AS) from 19 industrial WWTPs in the downstream area of the Yangtze River, China, A total of 38 samples of anaerobic sludge and oxic sludge were collected and analyzed. We found that salinity stress significantly inhibits the growth of the AS community, particularly evident in the anaerobic sludge community. Furthermore, the high-saline environment induces changes in the structure and functional patterns of the AS community, leading to intensive interactions and resource exchanges among microorganisms. Halophilic microorganisms may play a crucial role in this process, significantly impacting the overall community structure, especially in the oxic sludge community. Additionally, salinity stress not only suppresses the nitrogen transformation potential of the AS but also leads to the accumulation of nitrite, thereby increasing the emission potential of both NO and N2O, exacerbating the greenhouse effect of the A2O process in industrial WWTPs. The findings of this study provide necessary theoretical support for maintaining the long-term stable operation of the A2O sludge system in industrial WWTPs, reducing carbon footprint, and improving nitrogen removal efficiency.
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Affiliation(s)
- Yifan Jiang
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Ding Ma
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China; Anhui Engineering Research Center of Industrial Wastewater Treatment and Resource Recovery, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Jin Wang
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China; Anhui Engineering Research Center of Industrial Wastewater Treatment and Resource Recovery, Hefei University of Technology, Hefei, Anhui, 230009, China; Key Laboratory of Nanominerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Qingsheng Xu
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Jintao Fang
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Zhengbo Yue
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China; Anhui Engineering Research Center of Industrial Wastewater Treatment and Resource Recovery, Hefei University of Technology, Hefei, Anhui, 230009, China; Key Laboratory of Nanominerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, Anhui, 230009, China.
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4
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Zhang H, Wang S, Liu Z, Li Y, Wang Q, Zhang X, Li M, Zhang B. Community assembly and microbial interactions in an alkaline vanadium tailing pond. ENVIRONMENTAL RESEARCH 2024; 246:118104. [PMID: 38181847 DOI: 10.1016/j.envres.2024.118104] [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: 10/06/2023] [Revised: 12/22/2023] [Accepted: 01/02/2024] [Indexed: 01/07/2024]
Abstract
Intensive development of vanadium-titanium mines leads to an increasing discharge of vanadium (V) into the environment, imposing potential risks to both environmental system and public health. Microorganisms play a key role in the biogeochemical cycling of V, influencing its transformation and distribution. In addition, the characterization of microbial community patterns serves to assess potential threats imposed by elevated V exposure. However, the impact of V on microbial community remains largely unknown in alkaline V tailing areas with a substantial amounts of V accumulation and nutrient-poor conditions. This study aims to explore the characteristics of microbial community in a wet tailing pond nearby a large-scale V mine. The results reveal V contamination in both water (0.60 mg/L) and sediment tailings (340 mg/kg) in the tailing pond. Microbial community diversity shows distinctive pattern between environmental metrices. Genera with the functional potential of metal reduction\resistance, nitrogen metabolism, and carbon fixation have been identified. In this alkaline V tailing pond, V and pH are major drivers to induce community variation, particularly for functional bacteria. Stochastic processes primarily govern the assemblies of microbial community in the water samples, while deterministic process regulate the community assemblies of sediment tailings. Moreover, the co-occurrence network pattern unveils strong selective pattern for sediment tailings communities, where genera form a complex network structure exhibiting strong competition for limited resource. These findings reveal the patterns of microbial adaptions in wet vanadium tailing ponds, providing insightful guidelines to mitigate the negative impact of V tailing and develop sustainable management for mine-waste reservoir.
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Affiliation(s)
- Han Zhang
- State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua, 617000, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing, 100083, China; School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Song Wang
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing, 100083, China.
| | - Ziqi Liu
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing, 100083, China
| | - Yinong Li
- Foreign Environmental Cooperation Center, Ministry of Ecology and Environment of the People's Republic of China, Beijing, 100035, China.
| | - Qianwen Wang
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing, 100083, China
| | - Xiaolong Zhang
- State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua, 617000, China
| | - Ming Li
- State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua, 617000, China
| | - Baogang Zhang
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing, 100083, China
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Ren Z, Ma K, Jia X, Wang Q, Zhang C, Li X. Metagenomics Unveils Microbial Diversity and Their Biogeochemical Roles in Water and Sediment of Thermokarst Lakes in the Yellow River Source Area. MICROBIAL ECOLOGY 2023; 85:904-915. [PMID: 35650293 DOI: 10.1007/s00248-022-02053-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 05/25/2022] [Indexed: 05/04/2023]
Abstract
Thermokarst lakes have long been recognized as biogeochemical hotspots, especially as sources of greenhouse gases. On the Qinghai-Tibet Plateau, thermokarst lakes are experiencing extensive changes due to faster warming. For a deep understanding of internal lake biogeochemical processes, we applied metagenomic analyses to investigate the microbial diversity and their biogeochemical roles in sediment and water of thermokarst lakes in the Yellow River Source Area (YRSA). Sediment microbial communities (SMCs) had lower species and gene richness than water microbial communities (WMCs). Bacteria were the most abundant component in both SMCs and WMCs with significantly different abundant genera. The functional analyses showed that both SMCs and WMCs had low potential in methanogenesis but strong in aerobic respiration, nitrogen assimilation, exopolyphosphatase, glycerophosphodiester phosphodiesterases, and polyphosphate kinase. Moreover, SMCs were enriched in genes involved in anaerobic carbon fixation, aerobic carbon fixation, fermentation, most nitrogen metabolism pathways, dissimilatory sulfate reduction, sulfide oxidation, polysulfide reduction, 2-phosphonopropionate transporter, and phosphate regulation. WMCs were enriched in genes involved in assimilatory sulfate reduction, sulfur mineralization, phosphonoacetate hydrolase, and phosphonate transport. Functional potentials suggest the differences of greenhouse gas emission, nutrient cycling, and living strategies between SMCs and WMCs. This study provides insight into the main biogeochemical processes and their properties in thermokarst lakes in YRSA, improving our understanding of the roles and fates of these lakes in a warming world.
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Affiliation(s)
- Ze Ren
- Research and Development Center for Watershed Environmental Eco-Engineering, Advanced Institute of Natural Sciences, Beijing Normal University, 18 Jinfeng Road, Xiangzhou Distract, Zhuhai, 519087, Guangdong, China.
- School of Environment, Beijing Normal University, Beijing, 100875, China.
| | - Kang Ma
- School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Xuan Jia
- College of Education for the Future, Beijing Normal University, Zhuhai, 519087, China
| | - Qing Wang
- Research and Development Center for Watershed Environmental Eco-Engineering, Advanced Institute of Natural Sciences, Beijing Normal University, 18 Jinfeng Road, Xiangzhou Distract, Zhuhai, 519087, Guangdong, China
- School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Cheng Zhang
- Research and Development Center for Watershed Environmental Eco-Engineering, Advanced Institute of Natural Sciences, Beijing Normal University, 18 Jinfeng Road, Xiangzhou Distract, Zhuhai, 519087, Guangdong, China
- School of Engineering Technology, Beijing Normal University, Zhuhai, 519087, China
| | - Xia Li
- Research and Development Center for Watershed Environmental Eco-Engineering, Advanced Institute of Natural Sciences, Beijing Normal University, 18 Jinfeng Road, Xiangzhou Distract, Zhuhai, 519087, Guangdong, China
- School of Environment, Beijing Normal University, Beijing, 100875, China
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6
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Ren Z, Luo W. Metagenomic analysis reveals the diversity and distribution of antibiotic resistance genes in thermokarst lakes of the Yellow River Source Area. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 313:120102. [PMID: 36075331 DOI: 10.1016/j.envpol.2022.120102] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 08/27/2022] [Accepted: 08/31/2022] [Indexed: 06/15/2023]
Abstract
Thermokarst lakes form as the results of ice-rich permafrost thawing and act as important water resources in cold regions. However, the distributions of antibiotic resistance genes (ARGs) in thermokarst lakes are far less studied. Using metagenomic sequencing approach, we provided the first study to document ARGs in thermokarst lakes of the Yellow River Source Area on the Qinghai-Tibet Plateau (QTP). The results revealed that both sediment and water of the thermokarst lakes harbor diverse ARGs. Multidrug resistance genes were the most diverse, while rifamycin resistance genes were the most abundant with rpoB2 and rpoB genes having the highest proportion. Sediment samples contained more ARGs than water samples, but their composition differed between the two types of samples. However, the composition variations of sediment and water ARGs were closely correlated. The Sorensen dissimilarities of ARGs were controlled by strong turnover processes in sediment samples, and by turnover and nestedness in water samples. High contributions of nestedness were found between sediment and water samples. Moreover, ARGs in water had more significant relationships with environmental variables than that in sediment. Given the role of thermokarst lakes as important water resources in permafrost landscape, as well as intensifying influences of climate change and anthropogenetic activities, thermokarst lakes could bring potential ARG risks, warranting further investigation and evaluation.
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Affiliation(s)
- Ze Ren
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Wei Luo
- Key Laboratory for Polar Science, Polar Research Institute of China, Ministry of Natural Resources, Shanghai, 200136, China; School of Oceanography, Shanghai Jiao Tong University, Shanghai, 200030, China.
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Xu Q, Du Z, Wang L, Xue K, Wei Z, Zhang G, Liu K, Lin J, Lin P, Chen T, Xiao C. The Role of Thermokarst Lake Expansion in Altering the Microbial Community and Methane Cycling in Beiluhe Basin on Tibetan Plateau. Microorganisms 2022; 10:1620. [PMID: 36014037 PMCID: PMC9412574 DOI: 10.3390/microorganisms10081620] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 08/05/2022] [Accepted: 08/07/2022] [Indexed: 11/16/2022] Open
Abstract
One of the most significant environmental changes across the Tibetan Plateau (TP) is the rapid lake expansion. The expansion of thermokarst lakes affects the global biogeochemical cycles and local climate regulation by rising levels, expanding area, and increasing water volumes. Meanwhile, microbial activity contributes greatly to the biogeochemical cycle of carbon in the thermokarst lakes, including organic matter decomposition, soil formation, and mineralization. However, the impact of lake expansion on distribution patterns of microbial communities and methane cycling, especially those of water and sediment under ice, remain unknown. This hinders our ability to assess the true impact of lake expansion on ecosystem services and our ability to accurately investigate greenhouse gas emissions and consumption in thermokarst lakes. Here, we explored the patterns of microorganisms and methane cycling by investigating sediment and water samples at an oriented direction of expansion occurred from four points under ice of a mature-developed thermokarst lake on TP. In addition, the methane concentration of each water layer was examined. Microbial diversity and network complexity were different in our shallow points (MS, SH) and deep points (CE, SH). There are differences of microbial community composition among four points, resulting in the decreased relative abundances of dominant phyla, such as Firmicutes in sediment, Proteobacteria in water, Thermoplasmatota in sediment and water, and increased relative abundance of Actinobacteriota with MS and SH points. Microbial community composition involved in methane cycling also shifted, such as increases in USCγ, Methylomonas, and Methylobacter, with higher relative abundance consistent with low dissolved methane concentration in MS and SH points. There was a strong correlation between changes in microbiota characteristics and changes in water and sediment environmental factors. Together, these results show that lake expansion has an important impact on microbial diversity and methane cycling.
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Affiliation(s)
- Qian Xu
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhiheng Du
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Lei Wang
- Zhuhai Branch of State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Zhuhai 519087, China
| | - Kai Xue
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhiqiang Wei
- Zhuhai Branch of State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Zhuhai 519087, China
| | - Gaosen Zhang
- Key Laboratory of Extreme Environmental Microbial Resources and Engineering, Lanzhou 730000, China
- Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Keshao Liu
- State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Jiahui Lin
- State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
| | - Penglin Lin
- College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
| | - Tuo Chen
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
- Key Laboratory of Extreme Environmental Microbial Resources and Engineering, Lanzhou 730000, China
| | - Cunde Xiao
- State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
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Ren Z, Zhang C, Li X, Ma K, Cui B. Abundant and Rare Bacterial Taxa Structuring Differently in Sediment and Water in Thermokarst Lakes in the Yellow River Source Area, Qinghai-Tibet Plateau. Front Microbiol 2022; 13:774514. [PMID: 35422785 PMCID: PMC9002311 DOI: 10.3389/fmicb.2022.774514] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Accepted: 02/02/2022] [Indexed: 01/28/2023] Open
Abstract
Thermokarst lakes are forming from permafrost thaw and are severely affected by accelerating climate change. Sediment and water in these lakes are distinct habitats but closely connected. However, our understanding of the differences and linkages between sediment and water in thermokarst lakes remains largely unknown, especially from the perspective of community assembly mechanisms. Here, we examined bacterial communities in sediment and water in thermokarst lakes in the Yellow River Source area, Qinghai-Tibet Plateau. Bacterial taxa were divided into abundant and rare according to their relative abundance, and the Sorensen dissimilarity (βsor) was partitioned into turnover (βturn) and nestedness (βnest). The whole bacterial communities and the abundant and rare subcommunities differed substantially between sediment and water in taxonomical composition, α-diversity, and β-diversity. Sediment had significantly lower α-diversity indexes but higher β-diversity than water. In general, bacterial communities are predominantly governed by strong turnover processes (βturn/βsor ratio of 0.925). Bacterial communities in sediment had a significantly higher βturn/βsor ratio than in water. Abundant subcommunities were significantly lower in the βturn/βsor ratio compared with rare subcommunities. The results suggest that the bacterial communities of thermokarst lakes, especially rare subcommunities or particularly in sediment, might be strongly structured by heterogeneity in the source material, environmental filtering, and geographical isolation, leading to compositionally distinct communities. This integral study increased our current knowledge of thermokarst lakes, enhancing our understanding of the community assembly rules and ecosystem structures and processes of these rapidly changing and vulnerable ecosystems.
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Affiliation(s)
- Ze Ren
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, China.,School of Environment, Beijing Normal University, Beijing, China
| | - Cheng Zhang
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, China.,School of Engineering Technology, Beijing Normal University, Zhuhai, China
| | - Xia Li
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, China.,School of Environment, Beijing Normal University, Beijing, China
| | - Kang Ma
- School of Environment, Beijing Normal University, Beijing, China
| | - Baoshan Cui
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, China.,School of Environment, Beijing Normal University, Beijing, China
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9
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Ren Z, Ma K, Jia X, Wang Q, Zhang C, Li X. Community Assembly and Co-Occurrence Patterns of Microeukaryotes in Thermokarst Lakes of the Yellow River Source Area. Microorganisms 2022; 10:481. [PMID: 35208934 PMCID: PMC8877526 DOI: 10.3390/microorganisms10020481] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 02/15/2022] [Accepted: 02/17/2022] [Indexed: 01/02/2023] Open
Abstract
Thermokarst lakes are important aquatic ecosystems in cold regions, experiencing several changes due to global warming. However, the fundamental assembly mechanisms of microeukaryotic communities in thermokarst lakes are unknown. In this study, we examined the assembly processes and co-occurrence networks of microeukaryotic communities in sediment and water of thermokarst lakes in the Yellow River Source Area. Sediment microeukaryotic communities had a significantly lower α-diversity but higher β-diversity than water microeukaryotic communities. pH, sediment organic carbon, and total phosphorus significantly affected taxonomic and phylogenetic diversity of sediment communities, while conductivity was a significant driver for water communities. Both sediment and water microeukaryotic communities were strongly governed by dispersal limitation. However, deterministic processes, especially homogenous selection, were more relevant in structuring microeukaryotic communities in water than those in sediment. Changes in total nitrogen and phosphorus in sediment could contribute to shift its microeukaryotic communities from homogeneous selection to stochastic processes. Co-occurrence networks showed that water microeukaryotic communities are more complex and interconnected but have lower modularity than sediment microeukaryotic communities. The water microeukaryotic network had more modules than the sediment microeukaryotic network. These modules were dominated by different taxonomic groups and associated to different environmental variables.
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Affiliation(s)
- Ze Ren
- Research and Development Center for Watershed Environmental Eco-Engineering, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China; (Q.W.); (C.Z.); (X.L.)
- School of Environment, Beijing Normal University, Beijing 100875, China;
| | - Kang Ma
- School of Environment, Beijing Normal University, Beijing 100875, China;
| | - Xuan Jia
- College of Education for the Future, Beijing Normal University, Zhuhai 519087, China;
| | - Qing Wang
- Research and Development Center for Watershed Environmental Eco-Engineering, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China; (Q.W.); (C.Z.); (X.L.)
- School of Environment, Beijing Normal University, Beijing 100875, China;
| | - Cheng Zhang
- Research and Development Center for Watershed Environmental Eco-Engineering, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China; (Q.W.); (C.Z.); (X.L.)
- School of Engineering Technology, Beijing Normal University, Zhuhai 519087, China
| | - Xia Li
- Research and Development Center for Watershed Environmental Eco-Engineering, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China; (Q.W.); (C.Z.); (X.L.)
- School of Environment, Beijing Normal University, Beijing 100875, China;
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