Bioaccumulation Dynamics of Arsenate at the Base of Aquatic Food Webs
Periphyton is an important food source at the base of freshwater ecosystems that tends to bioconcentrate trace elements making them trophically available. The potential for arsenic–a trace element of particular concern due to its widespread occurrence, toxicity, and carcinogenicity–to bioconcentrate...
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Veröffentlicht in: | Environmental science & technology 2016-06, Vol.50 (12), p.6556-6564 |
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description | Periphyton is an important food source at the base of freshwater ecosystems that tends to bioconcentrate trace elements making them trophically available. The potential for arsenic–a trace element of particular concern due to its widespread occurrence, toxicity, and carcinogenicity–to bioconcentrate in periphyton and thus be available to benthic grazers is less well characterized. To better understand arsenate bioaccumulation dynamics in lotic food webs, we used a radiotracer approach to characterize accumulation in periphyton and subsequent trophic transfer to benthic grazers. Periphyton bioconcentrated As between 3,200–9,700-fold (dry weight) over 8 days without reaching steady state, suggesting that periphyton is a major sink for arsenate. However, As-enriched periphyton as a food source for the mayfly Neocloeon triangulifer resulted in negligible As accumulation in a full lifecycle exposure. Additional studies estimate dietary assimilation efficiency in several primary consumers ranging from 22% in the mayfly N. triangulifer to 75% in the mayfly Isonychia sp. X-ray fluorescence mapping revealed that As was predominantly associated with iron oxides in periphyton. We speculate that As adsorption to Fe in periphyton may play a role in reducing dietary bioavailability. Together, these results suggest that trophic movement of As in lotic food webs is relatively low, though species differences in bioaccumulation patterns are important. |
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The potential for arsenic–a trace element of particular concern due to its widespread occurrence, toxicity, and carcinogenicity–to bioconcentrate in periphyton and thus be available to benthic grazers is less well characterized. To better understand arsenate bioaccumulation dynamics in lotic food webs, we used a radiotracer approach to characterize accumulation in periphyton and subsequent trophic transfer to benthic grazers. Periphyton bioconcentrated As between 3,200–9,700-fold (dry weight) over 8 days without reaching steady state, suggesting that periphyton is a major sink for arsenate. However, As-enriched periphyton as a food source for the mayfly Neocloeon triangulifer resulted in negligible As accumulation in a full lifecycle exposure. Additional studies estimate dietary assimilation efficiency in several primary consumers ranging from 22% in the mayfly N. triangulifer to 75% in the mayfly Isonychia sp. X-ray fluorescence mapping revealed that As was predominantly associated with iron oxides in periphyton. We speculate that As adsorption to Fe in periphyton may play a role in reducing dietary bioavailability. Together, these results suggest that trophic movement of As in lotic food webs is relatively low, though species differences in bioaccumulation patterns are important.</description><identifier>ISSN: 0013-936X</identifier><identifier>EISSN: 1520-5851</identifier><identifier>DOI: 10.1021/acs.est.6b01453</identifier><identifier>PMID: 27223406</identifier><identifier>CODEN: ESTHAG</identifier><language>eng</language><publisher>United States: American Chemical Society</publisher><subject>Animals ; Aquatic ecosystems ; Arsenates ; Arsenic ; Bioaccumulation ; Ecosystem ; Food Chain ; Food chains ; Fresh Water ; Insecta ; Isonychia ; Trace elements</subject><ispartof>Environmental science & technology, 2016-06, Vol.50 (12), p.6556-6564</ispartof><rights>Copyright © 2016 American Chemical Society</rights><rights>Copyright American Chemical Society Jun 21, 2016</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a394t-e25beee1be05e3dffd5f1c4f3c8346b0d01937f4768e0dcecab31534c32a51e43</citedby><cites>FETCH-LOGICAL-a394t-e25beee1be05e3dffd5f1c4f3c8346b0d01937f4768e0dcecab31534c32a51e43</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.6b01453$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/acs.est.6b01453$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,2765,27076,27924,27925,56738,56788</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/27223406$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Lopez, Adeline R</creatorcontrib><creatorcontrib>Hesterberg, Dean R</creatorcontrib><creatorcontrib>Funk, David H</creatorcontrib><creatorcontrib>Buchwalter, David B</creatorcontrib><title>Bioaccumulation Dynamics of Arsenate at the Base of Aquatic Food Webs</title><title>Environmental science & technology</title><addtitle>Environ. Sci. Technol</addtitle><description>Periphyton is an important food source at the base of freshwater ecosystems that tends to bioconcentrate trace elements making them trophically available. The potential for arsenic–a trace element of particular concern due to its widespread occurrence, toxicity, and carcinogenicity–to bioconcentrate in periphyton and thus be available to benthic grazers is less well characterized. To better understand arsenate bioaccumulation dynamics in lotic food webs, we used a radiotracer approach to characterize accumulation in periphyton and subsequent trophic transfer to benthic grazers. Periphyton bioconcentrated As between 3,200–9,700-fold (dry weight) over 8 days without reaching steady state, suggesting that periphyton is a major sink for arsenate. However, As-enriched periphyton as a food source for the mayfly Neocloeon triangulifer resulted in negligible As accumulation in a full lifecycle exposure. Additional studies estimate dietary assimilation efficiency in several primary consumers ranging from 22% in the mayfly N. triangulifer to 75% in the mayfly Isonychia sp. X-ray fluorescence mapping revealed that As was predominantly associated with iron oxides in periphyton. We speculate that As adsorption to Fe in periphyton may play a role in reducing dietary bioavailability. Together, these results suggest that trophic movement of As in lotic food webs is relatively low, though species differences in bioaccumulation patterns are important.</description><subject>Animals</subject><subject>Aquatic ecosystems</subject><subject>Arsenates</subject><subject>Arsenic</subject><subject>Bioaccumulation</subject><subject>Ecosystem</subject><subject>Food Chain</subject><subject>Food chains</subject><subject>Fresh Water</subject><subject>Insecta</subject><subject>Isonychia</subject><subject>Trace elements</subject><issn>0013-936X</issn><issn>1520-5851</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp1kM1Lw0AQxRdRbK2evcmCF0HS7mc-jra2KhS8KHpbNptZTEmybTY59L93a6uC4Glg-L038x5Cl5SMKWF0oo0fg-_GcU6okPwIDalkJJKppMdoSAjlUcbj9wE6835FCGGcpKdowBLGuCDxEM2npdPG9HVf6a50Db7fNroujcfO4rvWQ6M7wLrD3Qfgqfbwtd_0ATZ44VyB3yD35-jE6srDxWGO0Oti_jJ7jJbPD0-zu2WkeSa6CJjMAYDmQCTwwtpCWmqE5SblIkQoCM14YkUSp0AKA0bnnEouDGdaUhB8hG72vuvWbfoQXNWlN1BVugHXe0VTksYZi0UW0Os_6Mr1bRO-UzTJMsYSmdJATfaUaZ33LVi1bstat1tFido1rELDaqc-NBwUVwffPq-h-OG_Kw3A7R7YKX9v_mP3CYbnhVM</recordid><startdate>20160621</startdate><enddate>20160621</enddate><creator>Lopez, Adeline R</creator><creator>Hesterberg, Dean R</creator><creator>Funk, David H</creator><creator>Buchwalter, David B</creator><general>American Chemical Society</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QO</scope><scope>7ST</scope><scope>7T7</scope><scope>7U7</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>SOI</scope></search><sort><creationdate>20160621</creationdate><title>Bioaccumulation Dynamics of Arsenate at the Base of Aquatic Food Webs</title><author>Lopez, Adeline R ; Hesterberg, Dean R ; Funk, David H ; Buchwalter, David B</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a394t-e25beee1be05e3dffd5f1c4f3c8346b0d01937f4768e0dcecab31534c32a51e43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Animals</topic><topic>Aquatic ecosystems</topic><topic>Arsenates</topic><topic>Arsenic</topic><topic>Bioaccumulation</topic><topic>Ecosystem</topic><topic>Food Chain</topic><topic>Food chains</topic><topic>Fresh Water</topic><topic>Insecta</topic><topic>Isonychia</topic><topic>Trace elements</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lopez, Adeline R</creatorcontrib><creatorcontrib>Hesterberg, Dean R</creatorcontrib><creatorcontrib>Funk, David H</creatorcontrib><creatorcontrib>Buchwalter, David B</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Biotechnology Research Abstracts</collection><collection>Environment Abstracts</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Toxicology Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Environment Abstracts</collection><jtitle>Environmental science & technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lopez, Adeline R</au><au>Hesterberg, Dean R</au><au>Funk, David H</au><au>Buchwalter, David B</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Bioaccumulation Dynamics of Arsenate at the Base of Aquatic Food Webs</atitle><jtitle>Environmental science & technology</jtitle><addtitle>Environ. Sci. Technol</addtitle><date>2016-06-21</date><risdate>2016</risdate><volume>50</volume><issue>12</issue><spage>6556</spage><epage>6564</epage><pages>6556-6564</pages><issn>0013-936X</issn><eissn>1520-5851</eissn><coden>ESTHAG</coden><abstract>Periphyton is an important food source at the base of freshwater ecosystems that tends to bioconcentrate trace elements making them trophically available. The potential for arsenic–a trace element of particular concern due to its widespread occurrence, toxicity, and carcinogenicity–to bioconcentrate in periphyton and thus be available to benthic grazers is less well characterized. To better understand arsenate bioaccumulation dynamics in lotic food webs, we used a radiotracer approach to characterize accumulation in periphyton and subsequent trophic transfer to benthic grazers. Periphyton bioconcentrated As between 3,200–9,700-fold (dry weight) over 8 days without reaching steady state, suggesting that periphyton is a major sink for arsenate. However, As-enriched periphyton as a food source for the mayfly Neocloeon triangulifer resulted in negligible As accumulation in a full lifecycle exposure. Additional studies estimate dietary assimilation efficiency in several primary consumers ranging from 22% in the mayfly N. triangulifer to 75% in the mayfly Isonychia sp. X-ray fluorescence mapping revealed that As was predominantly associated with iron oxides in periphyton. We speculate that As adsorption to Fe in periphyton may play a role in reducing dietary bioavailability. Together, these results suggest that trophic movement of As in lotic food webs is relatively low, though species differences in bioaccumulation patterns are important.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>27223406</pmid><doi>10.1021/acs.est.6b01453</doi><tpages>9</tpages></addata></record> |
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subjects | Animals Aquatic ecosystems Arsenates Arsenic Bioaccumulation Ecosystem Food Chain Food chains Fresh Water Insecta Isonychia Trace elements |
title | Bioaccumulation Dynamics of Arsenate at the Base of Aquatic Food Webs |
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