The Experts below are selected from a list of 15546 Experts worldwide ranked by ideXlab platform
Robert Duran - One of the best experts on this subject based on the ideXlab platform.
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metagenomic exploration of multi resistance genes linked to microbial attributes in active Nonferrous Metal loid tailings
Environmental Pollution, 2020Co-Authors: Jianli Liu, Jun Yao, Robert Duran, Xiaozhe Zhu, Deliang Zhou, Victor G. Mihucz, Safdar Bashir, Karen A HudsonedwardsAbstract:ABSTRACT Mine tailings sites are considered as a continuous source of discharged Metal(loid)s and residual organic flotation reagents. They are extremely toxic environments representing unique ecological niches for microbial communities. Mine tailings as a source of multi-resistance genes have been poorly investigated. Metagenomic analysis for four active Nonferrous Metal(loid) tailings sites with different environmental parameters was conducted. The abundance of Thiobacillus, able to tolerate acidity and showing iron- and sulfur/sulfide oxidation capacities, was significantly different (p
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Alteration of mixture toxicity in Nonferrous Metal mine tailings treated by biochar
Journal of Environmental Management, 2020Co-Authors: Jihai Gu, Geoffrey Sunahara, Robert Duran, Xiaoqi ZhouAbstract:Nonferrous Metal mining activities produce enormous amounts of tailings that contain high concentrations of toxic chemicals threatening human health and the environment. This risk could be alleviated using remediation agents such as biochar, as proposed by others. However, contradictory evidence indicates that biochar can increase or sometimes decrease bioavailable concentrations depending on the selection of Metal(loid)s in mine tailings. Here three biochars derived from different raw stocks were used to treat mine tailings samples. Chemical analyses indicated that all biochars favored the stabilization of Cd, Cr, Cu, Pb, and Zn, as well as the mobilization of As and Sb. The barley root elongation bioassay showed that the tailings toxicity was only partially diminished (up to 55.8%) or even elevated (up to 20.7%) by biochar treatment. Similar results were also observed from microbial enzyme assays (increased up to 28.3% or decreased up to 24.0%). Further analyses showed that these toxic effects correlated well with the relative toxicity index (R2 = 0.66 to 0.88). Toxicity testing coupled with the use of a toxicity prediction model presented here suggested that the release of As and Sb from tailings compromised the favorable effects of biochar treatment on toxic cationic Metals. Such information is of paramount importance when taking countermeasures for improving bioremediation technologies.
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Zifu Li, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and vertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world’s largest and potentially most toxic sources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0–10 cm), the stability was most attributed to Bacillus and Enterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has led to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical parameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the bioremediation and site management of Nonferrous Metal (loid) tailings.
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and ertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world's largest and potentially most toxic ources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0-10 cm), the stability was most attributed to Bacillus and nterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has ed to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical arameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the ioremediation and site management of Nonferrous Metal (loid) tailings.
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Bacterial diversity in typical abandoned multi-contaminated Nonferrous Metal(loid) tailings during natural attenuation
Environmental Pollution, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, Robert Duran, F. Wang, Ning Min, Tatjana Solevic-knudsen, Karen Hudson-edwards, Lena AlakangasAbstract:Abandoned Nonferrous Metal(loid) tailings sites are anthropogenic, and represent unique and extreme ecological niches for microbial communities. Tailings contain elevated and toxic content of Metal(loid)s that had negative effects on local human health and regional ecosystems. Microbial communities in these typical tailings undergoing natural attenuation are often very poorly examined. The diversity and inferred functions of bacterial communities were examined at seven Nonferrous Metal(loid) tailings sites in Guangxi (China), which were abandoned between 3 and 31 years ago. The acidity of the tailings sites rose over 31 years of site inactivity. Desulfurivibrio, which were always coupled with sulfur/sulfide oxidation to dissimilate the reduction of nitrate/nitrite, were specific in tailings with 3 years abandonment. However, genus beneficial to plant growth (Rhizobium), and iron/sulfur-oxidizing bacteria and Metal(loid)-related genera (Acidiferrobacter and Acidithiobacillus) were specific within tailings abandoned for 23 years or more. The increased abundance of acid-generating iron/sulfur-oxidizing and Metal(loid)-related bacteria and specific bacterial communities during the natural attenuation could provide new insights for understanding microbial ecosystem functioning in mine tailings. OTUs related to Sulfuriferula, Bacillus, Sulfurifustis, Gaiella, and Thiobacillus genera were the main contributors differentiating the bacterial communities between the different tailing sites. Multiple correlation analyses between bacterial communities and geochemical parameters indicated that pH, TOC, TN, As, Pb, and Cu were the main drivers influencing the bacterial community structures. PICRUSt functional exploration revealed that the main functions were related to DNA repair and recombination, important functions for bacterial adaptation to cope with the multi-contamination of tailings. Such information provides new insights to guide future metagenomic studies for the identification of key functions beyond Metal-transformation/resistance. As well, our results offers novel outlooks for the management of bacterial communities during natural attenuation of multi-contaminated Nonferrous Metal(loid) tailings sites.
Geoffrey Sunahara - One of the best experts on this subject based on the ideXlab platform.
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Alteration of mixture toxicity in Nonferrous Metal mine tailings treated by biochar
Journal of Environmental Management, 2020Co-Authors: Jihai Gu, Geoffrey Sunahara, Robert Duran, Xiaoqi ZhouAbstract:Nonferrous Metal mining activities produce enormous amounts of tailings that contain high concentrations of toxic chemicals threatening human health and the environment. This risk could be alleviated using remediation agents such as biochar, as proposed by others. However, contradictory evidence indicates that biochar can increase or sometimes decrease bioavailable concentrations depending on the selection of Metal(loid)s in mine tailings. Here three biochars derived from different raw stocks were used to treat mine tailings samples. Chemical analyses indicated that all biochars favored the stabilization of Cd, Cr, Cu, Pb, and Zn, as well as the mobilization of As and Sb. The barley root elongation bioassay showed that the tailings toxicity was only partially diminished (up to 55.8%) or even elevated (up to 20.7%) by biochar treatment. Similar results were also observed from microbial enzyme assays (increased up to 28.3% or decreased up to 24.0%). Further analyses showed that these toxic effects correlated well with the relative toxicity index (R2 = 0.66 to 0.88). Toxicity testing coupled with the use of a toxicity prediction model presented here suggested that the release of As and Sb from tailings compromised the favorable effects of biochar treatment on toxic cationic Metals. Such information is of paramount importance when taking countermeasures for improving bioremediation technologies.
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Zifu Li, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and vertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world’s largest and potentially most toxic sources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0–10 cm), the stability was most attributed to Bacillus and Enterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has led to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical parameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the bioremediation and site management of Nonferrous Metal (loid) tailings.
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and ertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world's largest and potentially most toxic ources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0-10 cm), the stability was most attributed to Bacillus and nterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has ed to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical arameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the ioremediation and site management of Nonferrous Metal (loid) tailings.
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Bacterial diversity in typical abandoned multi-contaminated Nonferrous Metal(loid) tailings during natural attenuation
Environmental Pollution, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, Robert Duran, F. Wang, Ning Min, Tatjana Solevic-knudsen, Karen Hudson-edwards, Lena AlakangasAbstract:Abandoned Nonferrous Metal(loid) tailings sites are anthropogenic, and represent unique and extreme ecological niches for microbial communities. Tailings contain elevated and toxic content of Metal(loid)s that had negative effects on local human health and regional ecosystems. Microbial communities in these typical tailings undergoing natural attenuation are often very poorly examined. The diversity and inferred functions of bacterial communities were examined at seven Nonferrous Metal(loid) tailings sites in Guangxi (China), which were abandoned between 3 and 31 years ago. The acidity of the tailings sites rose over 31 years of site inactivity. Desulfurivibrio, which were always coupled with sulfur/sulfide oxidation to dissimilate the reduction of nitrate/nitrite, were specific in tailings with 3 years abandonment. However, genus beneficial to plant growth (Rhizobium), and iron/sulfur-oxidizing bacteria and Metal(loid)-related genera (Acidiferrobacter and Acidithiobacillus) were specific within tailings abandoned for 23 years or more. The increased abundance of acid-generating iron/sulfur-oxidizing and Metal(loid)-related bacteria and specific bacterial communities during the natural attenuation could provide new insights for understanding microbial ecosystem functioning in mine tailings. OTUs related to Sulfuriferula, Bacillus, Sulfurifustis, Gaiella, and Thiobacillus genera were the main contributors differentiating the bacterial communities between the different tailing sites. Multiple correlation analyses between bacterial communities and geochemical parameters indicated that pH, TOC, TN, As, Pb, and Cu were the main drivers influencing the bacterial community structures. PICRUSt functional exploration revealed that the main functions were related to DNA repair and recombination, important functions for bacterial adaptation to cope with the multi-contamination of tailings. Such information provides new insights to guide future metagenomic studies for the identification of key functions beyond Metal-transformation/resistance. As well, our results offers novel outlooks for the management of bacterial communities during natural attenuation of multi-contaminated Nonferrous Metal(loid) tailings sites.
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Microbial activity and biodiversity responding to contamination of Metal(loid) in heterogeneous Nonferrous mining and smelting areas.
Chemosphere, 2019Co-Authors: Chao Lu, Geoffrey Sunahara, Zifu Li, Robert Duran, Hao Li, Victor G. MihuczAbstract:Abstract The combined contamination of Nonferrous Metal(loid) mining and smelting areas is a global issue, in need of urgent management. To our knowledge, this is the first report of microbial activities by microcalorimetry in specific Nonferrous Metal(loid) tailings with oligonutrition and high contents of toxic Metal(loid)s. Dynamics of bacterial diversity were also characterized. Here we show that tailings had low microbial activities (Pmax = 64.1–331 μW g−1), which were accelerated by the presence of dipotassium phosphate (Pmax = 346–856 μW g−1), as measured by microcalorimetry. Frequent detection of S- and Metal-resistant related genera and differences of Thiobacillus and Acidithiobacillus abundances indicated that the tailings were in an early stage of acidification. It has been further confirmed by the presence of a weak acid environment and secondary sulfur associated minerals, such as Sb2S3, FeAsS, FeS2, and CuFeS2. During the acidification process, phosphate, Metal(loid)s, and microbial activity were correlated to the bacterial communities. It is suggested that the bacterial communities have metabolic capacities with a high potential for the use in management processes of multi-contaminated Nonferrous Metalliferous tailings.
Jianli Liu - One of the best experts on this subject based on the ideXlab platform.
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metagenomic exploration of multi resistance genes linked to microbial attributes in active Nonferrous Metal loid tailings
Environmental Pollution, 2020Co-Authors: Jianli Liu, Jun Yao, Robert Duran, Xiaozhe Zhu, Deliang Zhou, Victor G. Mihucz, Safdar Bashir, Karen A HudsonedwardsAbstract:ABSTRACT Mine tailings sites are considered as a continuous source of discharged Metal(loid)s and residual organic flotation reagents. They are extremely toxic environments representing unique ecological niches for microbial communities. Mine tailings as a source of multi-resistance genes have been poorly investigated. Metagenomic analysis for four active Nonferrous Metal(loid) tailings sites with different environmental parameters was conducted. The abundance of Thiobacillus, able to tolerate acidity and showing iron- and sulfur/sulfide oxidation capacities, was significantly different (p
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Zifu Li, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and vertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world’s largest and potentially most toxic sources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0–10 cm), the stability was most attributed to Bacillus and Enterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has led to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical parameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the bioremediation and site management of Nonferrous Metal (loid) tailings.
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and ertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world's largest and potentially most toxic ources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0-10 cm), the stability was most attributed to Bacillus and nterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has ed to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical arameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the ioremediation and site management of Nonferrous Metal (loid) tailings.
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Bacterial diversity in typical abandoned multi-contaminated Nonferrous Metal(loid) tailings during natural attenuation
Environmental Pollution, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, Robert Duran, F. Wang, Ning Min, Tatjana Solevic-knudsen, Karen Hudson-edwards, Lena AlakangasAbstract:Abandoned Nonferrous Metal(loid) tailings sites are anthropogenic, and represent unique and extreme ecological niches for microbial communities. Tailings contain elevated and toxic content of Metal(loid)s that had negative effects on local human health and regional ecosystems. Microbial communities in these typical tailings undergoing natural attenuation are often very poorly examined. The diversity and inferred functions of bacterial communities were examined at seven Nonferrous Metal(loid) tailings sites in Guangxi (China), which were abandoned between 3 and 31 years ago. The acidity of the tailings sites rose over 31 years of site inactivity. Desulfurivibrio, which were always coupled with sulfur/sulfide oxidation to dissimilate the reduction of nitrate/nitrite, were specific in tailings with 3 years abandonment. However, genus beneficial to plant growth (Rhizobium), and iron/sulfur-oxidizing bacteria and Metal(loid)-related genera (Acidiferrobacter and Acidithiobacillus) were specific within tailings abandoned for 23 years or more. The increased abundance of acid-generating iron/sulfur-oxidizing and Metal(loid)-related bacteria and specific bacterial communities during the natural attenuation could provide new insights for understanding microbial ecosystem functioning in mine tailings. OTUs related to Sulfuriferula, Bacillus, Sulfurifustis, Gaiella, and Thiobacillus genera were the main contributors differentiating the bacterial communities between the different tailing sites. Multiple correlation analyses between bacterial communities and geochemical parameters indicated that pH, TOC, TN, As, Pb, and Cu were the main drivers influencing the bacterial community structures. PICRUSt functional exploration revealed that the main functions were related to DNA repair and recombination, important functions for bacterial adaptation to cope with the multi-contamination of tailings. Such information provides new insights to guide future metagenomic studies for the identification of key functions beyond Metal-transformation/resistance. As well, our results offers novel outlooks for the management of bacterial communities during natural attenuation of multi-contaminated Nonferrous Metal(loid) tailings sites.
Jun Yao - One of the best experts on this subject based on the ideXlab platform.
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metagenomic exploration of multi resistance genes linked to microbial attributes in active Nonferrous Metal loid tailings
Environmental Pollution, 2020Co-Authors: Jianli Liu, Jun Yao, Robert Duran, Xiaozhe Zhu, Deliang Zhou, Victor G. Mihucz, Safdar Bashir, Karen A HudsonedwardsAbstract:ABSTRACT Mine tailings sites are considered as a continuous source of discharged Metal(loid)s and residual organic flotation reagents. They are extremely toxic environments representing unique ecological niches for microbial communities. Mine tailings as a source of multi-resistance genes have been poorly investigated. Metagenomic analysis for four active Nonferrous Metal(loid) tailings sites with different environmental parameters was conducted. The abundance of Thiobacillus, able to tolerate acidity and showing iron- and sulfur/sulfide oxidation capacities, was significantly different (p
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Zifu Li, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and vertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world’s largest and potentially most toxic sources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0–10 cm), the stability was most attributed to Bacillus and Enterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has led to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical parameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the bioremediation and site management of Nonferrous Metal (loid) tailings.
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and ertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world's largest and potentially most toxic ources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0-10 cm), the stability was most attributed to Bacillus and nterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has ed to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical arameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the ioremediation and site management of Nonferrous Metal (loid) tailings.
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Bacterial diversity in typical abandoned multi-contaminated Nonferrous Metal(loid) tailings during natural attenuation
Environmental Pollution, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, Robert Duran, F. Wang, Ning Min, Tatjana Solevic-knudsen, Karen Hudson-edwards, Lena AlakangasAbstract:Abandoned Nonferrous Metal(loid) tailings sites are anthropogenic, and represent unique and extreme ecological niches for microbial communities. Tailings contain elevated and toxic content of Metal(loid)s that had negative effects on local human health and regional ecosystems. Microbial communities in these typical tailings undergoing natural attenuation are often very poorly examined. The diversity and inferred functions of bacterial communities were examined at seven Nonferrous Metal(loid) tailings sites in Guangxi (China), which were abandoned between 3 and 31 years ago. The acidity of the tailings sites rose over 31 years of site inactivity. Desulfurivibrio, which were always coupled with sulfur/sulfide oxidation to dissimilate the reduction of nitrate/nitrite, were specific in tailings with 3 years abandonment. However, genus beneficial to plant growth (Rhizobium), and iron/sulfur-oxidizing bacteria and Metal(loid)-related genera (Acidiferrobacter and Acidithiobacillus) were specific within tailings abandoned for 23 years or more. The increased abundance of acid-generating iron/sulfur-oxidizing and Metal(loid)-related bacteria and specific bacterial communities during the natural attenuation could provide new insights for understanding microbial ecosystem functioning in mine tailings. OTUs related to Sulfuriferula, Bacillus, Sulfurifustis, Gaiella, and Thiobacillus genera were the main contributors differentiating the bacterial communities between the different tailing sites. Multiple correlation analyses between bacterial communities and geochemical parameters indicated that pH, TOC, TN, As, Pb, and Cu were the main drivers influencing the bacterial community structures. PICRUSt functional exploration revealed that the main functions were related to DNA repair and recombination, important functions for bacterial adaptation to cope with the multi-contamination of tailings. Such information provides new insights to guide future metagenomic studies for the identification of key functions beyond Metal-transformation/resistance. As well, our results offers novel outlooks for the management of bacterial communities during natural attenuation of multi-contaminated Nonferrous Metal(loid) tailings sites.
F. Wang - One of the best experts on this subject based on the ideXlab platform.
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Zifu Li, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and vertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world’s largest and potentially most toxic sources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0–10 cm), the stability was most attributed to Bacillus and Enterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has led to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical parameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the bioremediation and site management of Nonferrous Metal (loid) tailings.
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Nonferrous Metal (loid) s mediate bacterial diversity in an abandoned mine tailing impoundment
Environmental Science and Pollution Research, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, F. Wang, Robert DuranAbstract:Migration and transformation of toxic Metal (loid) s in tailing sites inevitably lead to ecological disturbances and serious threats to the surroundings. However, the horizontal and ertical distribution of bacterial diversity has not been determined in Nonferrous Metal (loid) tailing ponds, especially in Guangxi China, where the world's largest and potentially most toxic ources of Metal (loid) s are located. Distribution of bacterial communities was stable at horizontal levels. At the surface (0-10 cm), the stability was most attributed to Bacillus and nterococcus, while bacterial communities at the subsurface (50 cm) were mainly contributed by Nitrospira and Sulfuricella. Variable vertical distribution of bacterial communities has ed to the occurrence of specific genera and specific predicted functions (such as transcription regulation factors). Sulfurifustis (a S-oxidizing and inorganic carbon fixing bacteria) genera were specific at the surface, whereas Streptococcus-related genera were found at the surface and subsurface, but were more abundant in the latter depth. Physical-chemical arameters, such as pH, TN, and Metal (loid) (As, Cd, Pb, Cu, and Zn) concentrations were the main drivers of bacterial community abundance, diversity, composition, and metabolic functions. These results increase our understanding of the physical-chemical effects on the spatial distribution of bacterial communities and provide useful insight for the ioremediation and site management of Nonferrous Metal (loid) tailings.
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Bacterial diversity in typical abandoned multi-contaminated Nonferrous Metal(loid) tailings during natural attenuation
Environmental Pollution, 2019Co-Authors: Jianli Liu, Geoffrey Sunahara, Jun Yao, Robert Duran, F. Wang, Ning Min, Tatjana Solevic-knudsen, Karen Hudson-edwards, Lena AlakangasAbstract:Abandoned Nonferrous Metal(loid) tailings sites are anthropogenic, and represent unique and extreme ecological niches for microbial communities. Tailings contain elevated and toxic content of Metal(loid)s that had negative effects on local human health and regional ecosystems. Microbial communities in these typical tailings undergoing natural attenuation are often very poorly examined. The diversity and inferred functions of bacterial communities were examined at seven Nonferrous Metal(loid) tailings sites in Guangxi (China), which were abandoned between 3 and 31 years ago. The acidity of the tailings sites rose over 31 years of site inactivity. Desulfurivibrio, which were always coupled with sulfur/sulfide oxidation to dissimilate the reduction of nitrate/nitrite, were specific in tailings with 3 years abandonment. However, genus beneficial to plant growth (Rhizobium), and iron/sulfur-oxidizing bacteria and Metal(loid)-related genera (Acidiferrobacter and Acidithiobacillus) were specific within tailings abandoned for 23 years or more. The increased abundance of acid-generating iron/sulfur-oxidizing and Metal(loid)-related bacteria and specific bacterial communities during the natural attenuation could provide new insights for understanding microbial ecosystem functioning in mine tailings. OTUs related to Sulfuriferula, Bacillus, Sulfurifustis, Gaiella, and Thiobacillus genera were the main contributors differentiating the bacterial communities between the different tailing sites. Multiple correlation analyses between bacterial communities and geochemical parameters indicated that pH, TOC, TN, As, Pb, and Cu were the main drivers influencing the bacterial community structures. PICRUSt functional exploration revealed that the main functions were related to DNA repair and recombination, important functions for bacterial adaptation to cope with the multi-contamination of tailings. Such information provides new insights to guide future metagenomic studies for the identification of key functions beyond Metal-transformation/resistance. As well, our results offers novel outlooks for the management of bacterial communities during natural attenuation of multi-contaminated Nonferrous Metal(loid) tailings sites.