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Carbon, Metals, and Grain Size Correlate with Bacterial Community Structure in Sediments of a High Arsenic Aquifer
Bacterial communities can exert significant influence on the biogeochemical cycling of arsenic (As). This has globally important implications since As in drinking water affects the health of over 100 million people worldwide, including in the Ganges–Brahmaputra Delta region of Bangladesh where geoge...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Research Foundation
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3311048/ https://www.ncbi.nlm.nih.gov/pubmed/22470368 http://dx.doi.org/10.3389/fmicb.2012.00082 |
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author | Legg, Teresa M. Zheng, Yan Simone, Bailey Radloff, Kathleen A. Mladenov, Natalie González, Antonio Knights, Dan Siu, Ho Chit Rahman, M. Moshiur Ahmed, K. Matin McKnight, Diane M. Nemergut, Diana R. |
author_facet | Legg, Teresa M. Zheng, Yan Simone, Bailey Radloff, Kathleen A. Mladenov, Natalie González, Antonio Knights, Dan Siu, Ho Chit Rahman, M. Moshiur Ahmed, K. Matin McKnight, Diane M. Nemergut, Diana R. |
author_sort | Legg, Teresa M. |
collection | PubMed |
description | Bacterial communities can exert significant influence on the biogeochemical cycling of arsenic (As). This has globally important implications since As in drinking water affects the health of over 100 million people worldwide, including in the Ganges–Brahmaputra Delta region of Bangladesh where geogenic arsenic in groundwater can reach concentrations of more than 10 times the World Health Organization’s limit. Thus, the goal of this research was to investigate patterns in bacterial community composition across gradients in sediment texture and chemistry in an aquifer with elevated groundwater As concentrations in Araihazar, Bangladesh. We characterized the bacterial community by pyrosequencing 16S rRNA genes from aquifer sediment samples collected at three locations along a groundwater flow path at a range of depths between 1.5 and 15 m. We identified significant differences in bacterial community composition between locations in the aquifer. In addition, we found that bacterial community structure was significantly related to sediment grain size, and sediment carbon (C), manganese (Mn), and iron (Fe) concentrations. Deltaproteobacteria and Chloroflexi were found in higher proportions in silty sediments with higher concentrations of C, Fe, and Mn. By contrast, Alphaproteobacteria and Betaproteobacteria were in higher proportions in sandy sediments with lower concentrations of C and metals. Based on the phylogenetic affiliations of these taxa, these results may indicate a shift to more Fe-, Mn-, and humic substance-reducers in the high C and metal sediments. It is well-documented that C, Mn, and Fe may influence the mobility of groundwater arsenic, and it is intriguing that these constituents may also structure the bacterial community. |
format | Online Article Text |
id | pubmed-3311048 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | Frontiers Research Foundation |
record_format | MEDLINE/PubMed |
spelling | pubmed-33110482012-04-02 Carbon, Metals, and Grain Size Correlate with Bacterial Community Structure in Sediments of a High Arsenic Aquifer Legg, Teresa M. Zheng, Yan Simone, Bailey Radloff, Kathleen A. Mladenov, Natalie González, Antonio Knights, Dan Siu, Ho Chit Rahman, M. Moshiur Ahmed, K. Matin McKnight, Diane M. Nemergut, Diana R. Front Microbiol Microbiology Bacterial communities can exert significant influence on the biogeochemical cycling of arsenic (As). This has globally important implications since As in drinking water affects the health of over 100 million people worldwide, including in the Ganges–Brahmaputra Delta region of Bangladesh where geogenic arsenic in groundwater can reach concentrations of more than 10 times the World Health Organization’s limit. Thus, the goal of this research was to investigate patterns in bacterial community composition across gradients in sediment texture and chemistry in an aquifer with elevated groundwater As concentrations in Araihazar, Bangladesh. We characterized the bacterial community by pyrosequencing 16S rRNA genes from aquifer sediment samples collected at three locations along a groundwater flow path at a range of depths between 1.5 and 15 m. We identified significant differences in bacterial community composition between locations in the aquifer. In addition, we found that bacterial community structure was significantly related to sediment grain size, and sediment carbon (C), manganese (Mn), and iron (Fe) concentrations. Deltaproteobacteria and Chloroflexi were found in higher proportions in silty sediments with higher concentrations of C, Fe, and Mn. By contrast, Alphaproteobacteria and Betaproteobacteria were in higher proportions in sandy sediments with lower concentrations of C and metals. Based on the phylogenetic affiliations of these taxa, these results may indicate a shift to more Fe-, Mn-, and humic substance-reducers in the high C and metal sediments. It is well-documented that C, Mn, and Fe may influence the mobility of groundwater arsenic, and it is intriguing that these constituents may also structure the bacterial community. Frontiers Research Foundation 2012-03-23 /pmc/articles/PMC3311048/ /pubmed/22470368 http://dx.doi.org/10.3389/fmicb.2012.00082 Text en Copyright © 2012 Legg, Zheng, Simone, Radloff, Mladenov, González, Knights, Siu, Rahman, Ahmed, McKnight and Nemergut. http://www.frontiersin.org/licenseagreement This is an open-access article distributed under the terms of the Creative Commons Attribution Non Commercial License, which permits non-commercial use, distribution, and reproduction in other forums, provided the original authors and source are credited. |
spellingShingle | Microbiology Legg, Teresa M. Zheng, Yan Simone, Bailey Radloff, Kathleen A. Mladenov, Natalie González, Antonio Knights, Dan Siu, Ho Chit Rahman, M. Moshiur Ahmed, K. Matin McKnight, Diane M. Nemergut, Diana R. Carbon, Metals, and Grain Size Correlate with Bacterial Community Structure in Sediments of a High Arsenic Aquifer |
title | Carbon, Metals, and Grain Size Correlate with Bacterial Community Structure in Sediments of a High Arsenic Aquifer |
title_full | Carbon, Metals, and Grain Size Correlate with Bacterial Community Structure in Sediments of a High Arsenic Aquifer |
title_fullStr | Carbon, Metals, and Grain Size Correlate with Bacterial Community Structure in Sediments of a High Arsenic Aquifer |
title_full_unstemmed | Carbon, Metals, and Grain Size Correlate with Bacterial Community Structure in Sediments of a High Arsenic Aquifer |
title_short | Carbon, Metals, and Grain Size Correlate with Bacterial Community Structure in Sediments of a High Arsenic Aquifer |
title_sort | carbon, metals, and grain size correlate with bacterial community structure in sediments of a high arsenic aquifer |
topic | Microbiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3311048/ https://www.ncbi.nlm.nih.gov/pubmed/22470368 http://dx.doi.org/10.3389/fmicb.2012.00082 |
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