Stimulation of Microbially Mediated Arsenic Release in Bangladesh Aquifers by Young Carbon Indicated by Radiocarbon Analysis of Sedimentary Bacterial Lipids
The sources of reduced carbon driving the microbially mediated release of arsenic to shallow groundwater in Bangladesh remain poorly understood. Using radiocarbon analysis of phospholipid fatty acids (PLFAs) and potential carbon pools, the abundance and carbon sources of the active, sediment-associa...
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| Veröffentlicht in: | Environmental science & technology 2016-07, Vol.50 (14), p.7353-7363 |
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| creator | Whaley-Martin, K. J Mailloux, B. J van Geen, A Bostick, B. C Silvern, R. F Kim, C Ahmed, K. M Choudhury, I Slater, G. F |
| description | The sources of reduced carbon driving the microbially mediated release of arsenic to shallow groundwater in Bangladesh remain poorly understood. Using radiocarbon analysis of phospholipid fatty acids (PLFAs) and potential carbon pools, the abundance and carbon sources of the active, sediment-associated, in situ bacterial communities inhabiting shallow aquifers ( |
| doi_str_mv | 10.1021/acs.est.6b00868 |
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J ; Mailloux, B. J ; van Geen, A ; Bostick, B. C ; Silvern, R. F ; Kim, C ; Ahmed, K. M ; Choudhury, I ; Slater, G. F</creator><creatorcontrib>Whaley-Martin, K. J ; Mailloux, B. J ; van Geen, A ; Bostick, B. C ; Silvern, R. F ; Kim, C ; Ahmed, K. M ; Choudhury, I ; Slater, G. F</creatorcontrib><description>The sources of reduced carbon driving the microbially mediated release of arsenic to shallow groundwater in Bangladesh remain poorly understood. Using radiocarbon analysis of phospholipid fatty acids (PLFAs) and potential carbon pools, the abundance and carbon sources of the active, sediment-associated, in situ bacterial communities inhabiting shallow aquifers (<30 m) at two sites in Araihazar, Bangladesh, were investigated. At both sites, sedimentary organic carbon (SOC) Δ14C signatures of −631 ± 54‰ (n = 12) were significantly depleted relative to dissolved inorganic carbon (DIC) of +24 ± 30‰ and dissolved organic carbon (DOC) of −230 ± 100‰. Sediment-associated PLFA Δ14C signatures (n = 10) at Site F (−167‰ to +20‰) and Site B (−163‰ to +21‰) were highly consistent and indicated utilization of carbon sources younger than the SOC, likely from the DOC pool. Sediment-associated PLFA Δ14C signatures were consistent with previously determined Δ14C signatures of microbial DNA sampled from groundwater at Site F indicating that the carbon source for these two components of the subsurface microbial community is consistent and is temporally stable over the two years between studies. These results demonstrate that the utilization of relatively young carbon sources by the subsurface microbial community occurs at sites with varying hydrology. Further they indicate that these young carbon sources drive the metabolism of the more abundant sediment-associated microbial communities that are presumably more capable of Fe reduction and associated release of As. This implies that an introduction of younger carbon to as of yet unaffected sediments (such as those comprising the deeper Pleistocene aquifer) could stimulate microbial communities and result in arsenic release.</description><identifier>ISSN: 0013-936X</identifier><identifier>ISSN: 1520-5851</identifier><identifier>EISSN: 1520-5851</identifier><identifier>DOI: 10.1021/acs.est.6b00868</identifier><identifier>PMID: 27333443</identifier><identifier>CODEN: ESTHAG</identifier><language>eng</language><publisher>United States: American Chemical Society</publisher><subject>Aquifers ; Arsenic ; Bacteria ; bacterial communities ; Bangladesh ; Carbon ; carbon sinks ; dissolved inorganic carbon ; DNA ; Geologic Sediments - microbiology ; groundwater ; Groundwater - microbiology ; iron ; Lipids ; metabolism ; Microorganisms ; phospholipid fatty acids ; Phospholipids ; Sediments ; Water Pollutants, Chemical</subject><ispartof>Environmental science & technology, 2016-07, Vol.50 (14), p.7353-7363</ispartof><rights>Copyright © 2016 American Chemical Society</rights><rights>Copyright American Chemical Society Jul 19, 2016</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a523t-6011796d854f8de2060f020f2cd254ec7c3a6f6522e06eed048dd16ca363e9f93</citedby><cites>FETCH-LOGICAL-a523t-6011796d854f8de2060f020f2cd254ec7c3a6f6522e06eed048dd16ca363e9f93</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/acs.est.6b00868$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/acs.est.6b00868$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>230,314,776,780,881,2752,27053,27901,27902,56713,56763</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/27333443$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Whaley-Martin, K. J</creatorcontrib><creatorcontrib>Mailloux, B. J</creatorcontrib><creatorcontrib>van Geen, A</creatorcontrib><creatorcontrib>Bostick, B. C</creatorcontrib><creatorcontrib>Silvern, R. F</creatorcontrib><creatorcontrib>Kim, C</creatorcontrib><creatorcontrib>Ahmed, K. M</creatorcontrib><creatorcontrib>Choudhury, I</creatorcontrib><creatorcontrib>Slater, G. F</creatorcontrib><title>Stimulation of Microbially Mediated Arsenic Release in Bangladesh Aquifers by Young Carbon Indicated by Radiocarbon Analysis of Sedimentary Bacterial Lipids</title><title>Environmental science & technology</title><addtitle>Environ. Sci. Technol</addtitle><description>The sources of reduced carbon driving the microbially mediated release of arsenic to shallow groundwater in Bangladesh remain poorly understood. Using radiocarbon analysis of phospholipid fatty acids (PLFAs) and potential carbon pools, the abundance and carbon sources of the active, sediment-associated, in situ bacterial communities inhabiting shallow aquifers (<30 m) at two sites in Araihazar, Bangladesh, were investigated. At both sites, sedimentary organic carbon (SOC) Δ14C signatures of −631 ± 54‰ (n = 12) were significantly depleted relative to dissolved inorganic carbon (DIC) of +24 ± 30‰ and dissolved organic carbon (DOC) of −230 ± 100‰. Sediment-associated PLFA Δ14C signatures (n = 10) at Site F (−167‰ to +20‰) and Site B (−163‰ to +21‰) were highly consistent and indicated utilization of carbon sources younger than the SOC, likely from the DOC pool. Sediment-associated PLFA Δ14C signatures were consistent with previously determined Δ14C signatures of microbial DNA sampled from groundwater at Site F indicating that the carbon source for these two components of the subsurface microbial community is consistent and is temporally stable over the two years between studies. These results demonstrate that the utilization of relatively young carbon sources by the subsurface microbial community occurs at sites with varying hydrology. Further they indicate that these young carbon sources drive the metabolism of the more abundant sediment-associated microbial communities that are presumably more capable of Fe reduction and associated release of As. This implies that an introduction of younger carbon to as of yet unaffected sediments (such as those comprising the deeper Pleistocene aquifer) could stimulate microbial communities and result in arsenic release.</description><subject>Aquifers</subject><subject>Arsenic</subject><subject>Bacteria</subject><subject>bacterial communities</subject><subject>Bangladesh</subject><subject>Carbon</subject><subject>carbon sinks</subject><subject>dissolved inorganic carbon</subject><subject>DNA</subject><subject>Geologic Sediments - microbiology</subject><subject>groundwater</subject><subject>Groundwater - microbiology</subject><subject>iron</subject><subject>Lipids</subject><subject>metabolism</subject><subject>Microorganisms</subject><subject>phospholipid fatty acids</subject><subject>Phospholipids</subject><subject>Sediments</subject><subject>Water Pollutants, Chemical</subject><issn>0013-936X</issn><issn>1520-5851</issn><issn>1520-5851</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkk9v1DAQxSMEokvhzA1Z4oKEsh3bieNckLYr_lTaCqkFCU6WY0-2rrLO1k6Q9rvwYXHYpbRICE4-zG_eG8-8LHtOYU6B0RNt4hzjMBcNgBTyQTajJYO8lCV9mM0AKM9rLr4cZU9ivAYAxkE-zo5YxTkvCj7Lvl8ObjN2enC9J31Lzp0JfeN01-3IOVqnB7RkESJ6Z8gFdqgjEufJqfbrTluMV2RxM7oWQyTNjnztR78mSx2aJHfmrTM_BVLlQlvXm31h4XW3iy5OhpfJZIN-0GGXRM2AIZmTlds6G59mj1rdRXx2eI-zz-_eflp-yFcf358tF6tcl4wPuQBKq1pYWRattMhAQAsMWmYsKws0leFatKJkDEEgWiiktVQYzQXHuq35cfZmr7sdmw1ak8YJulPb4DZpLNVrp-5XvLtS6_6bKitKeS2TwKuDQOhvxnQQtXHRYNdpj_0YFZtWTyta_RulklJZSQb1f6BQVmVdUJ7Ql3-g1_0Y0poPVE0ZTN4neyrdOMaA7e0XKagpTyrlSU3dhzyljhd3N3PL_wpQAl7vganzt-df5H4ALfzX9w</recordid><startdate>20160719</startdate><enddate>20160719</enddate><creator>Whaley-Martin, K. 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J</au><au>Mailloux, B. J</au><au>van Geen, A</au><au>Bostick, B. C</au><au>Silvern, R. F</au><au>Kim, C</au><au>Ahmed, K. M</au><au>Choudhury, I</au><au>Slater, G. F</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Stimulation of Microbially Mediated Arsenic Release in Bangladesh Aquifers by Young Carbon Indicated by Radiocarbon Analysis of Sedimentary Bacterial Lipids</atitle><jtitle>Environmental science & technology</jtitle><addtitle>Environ. Sci. Technol</addtitle><date>2016-07-19</date><risdate>2016</risdate><volume>50</volume><issue>14</issue><spage>7353</spage><epage>7363</epage><pages>7353-7363</pages><issn>0013-936X</issn><issn>1520-5851</issn><eissn>1520-5851</eissn><coden>ESTHAG</coden><abstract>The sources of reduced carbon driving the microbially mediated release of arsenic to shallow groundwater in Bangladesh remain poorly understood. Using radiocarbon analysis of phospholipid fatty acids (PLFAs) and potential carbon pools, the abundance and carbon sources of the active, sediment-associated, in situ bacterial communities inhabiting shallow aquifers (<30 m) at two sites in Araihazar, Bangladesh, were investigated. At both sites, sedimentary organic carbon (SOC) Δ14C signatures of −631 ± 54‰ (n = 12) were significantly depleted relative to dissolved inorganic carbon (DIC) of +24 ± 30‰ and dissolved organic carbon (DOC) of −230 ± 100‰. Sediment-associated PLFA Δ14C signatures (n = 10) at Site F (−167‰ to +20‰) and Site B (−163‰ to +21‰) were highly consistent and indicated utilization of carbon sources younger than the SOC, likely from the DOC pool. Sediment-associated PLFA Δ14C signatures were consistent with previously determined Δ14C signatures of microbial DNA sampled from groundwater at Site F indicating that the carbon source for these two components of the subsurface microbial community is consistent and is temporally stable over the two years between studies. These results demonstrate that the utilization of relatively young carbon sources by the subsurface microbial community occurs at sites with varying hydrology. Further they indicate that these young carbon sources drive the metabolism of the more abundant sediment-associated microbial communities that are presumably more capable of Fe reduction and associated release of As. This implies that an introduction of younger carbon to as of yet unaffected sediments (such as those comprising the deeper Pleistocene aquifer) could stimulate microbial communities and result in arsenic release.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>27333443</pmid><doi>10.1021/acs.est.6b00868</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Aquifers Arsenic Bacteria bacterial communities Bangladesh Carbon carbon sinks dissolved inorganic carbon DNA Geologic Sediments - microbiology groundwater Groundwater - microbiology iron Lipids metabolism Microorganisms phospholipid fatty acids Phospholipids Sediments Water Pollutants, Chemical |
| title | Stimulation of Microbially Mediated Arsenic Release in Bangladesh Aquifers by Young Carbon Indicated by Radiocarbon Analysis of Sedimentary Bacterial Lipids |
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