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• W1968596937 abstract "AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AB 4:99-111 (2008) - DOI: https://doi.org/10.3354/ab00106 FEATURE ARTICLE Nitrogen stable isotopes in the shell of Mercenaria mercenaria trace wastewater inputs from watersheds to estuarine ecosystems Ruth H. Carmichael1,*, Theresa Hattenrath2, Ivan Valiela3, Robert H. Michener4 1Dauphin Island Sea Lab, and University of Southern Alabama, 101 Bienville Blvd., Dauphin Island, Alabama 36528, USA 2Department of Marine Biology, University of Maine at Machias, 9 O’Brien Avenue, Machias, Maine 04654, USA 3The Ecosystems Center, Marine Biology Laboratory, Woods Hole, Massachusetts 02343, USA 4Department of Biology, Boston University, 5 Cummington Street, Boston, Massachusetts 02215, USA *Email: rcarmichael@disl.org ABSTRACT: We tested the usefulness of δ15N values in the organic matrix of whole shells from Mercenaria mercenaria as tracers of anthropogenic nitrogen inputs to coastal ecosystems. Low and high stringency acidification methods were used to define parameters for reliable δ15N determination in shell material for comparison with δ15N values in soft tissues. δ15N values in shell from transplanted and native clams reflected %-wastewater contribution to estuaries, but were 2.3 to 2.5% lighter than δ15N values in soft tissues. Accuracy of δ15N values in shell material depended on recovering a sufficient quantity of organic N from shell (~70 µg) and was not altered by acidification method. Reliable δ15N values were obtained with as little as 80 mg of shell and using 100 µl of acid, but higher stringency methods (treating more shell with more acid for longer duration) typically yielded more N for subsequent stable isotope analysis. Conversely, higher concentrations of acid reduced N recovery. These results suggest that the content of N recovered was of greater concern to obtaining reliable δ15N values from shell material than acidification effects. Differences between δ15N values in shell material and soft tissues likely reflected differences in N assimilation among tissues. In combination with other analyses, this method may be applied to refine modern and historical trophic assessments and discern natural from anthropogenic influences on coastal ecosystems KEY WORDS: Acidification · Bivalve · Carbonate · Tissue · Nitrogen · Stable isotope · Anthropogenic Full text in pdf format Information about this Feature Article NextCite this article as: Carmichael RH, Hattenrath T, Valiela I, Michener RH (2008) Nitrogen stable isotopes in the shell of Mercenaria mercenaria trace wastewater inputs from watersheds to estuarine ecosystems. Aquat Biol 4:99-111. https://doi.org/10.3354/ab00106 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AB Vol. 4, No. 2. Online publication date: November 25, 2008 Print ISSN: 1864-7782; Online ISSN: 1864-7790 Copyright © 2008 Inter-Research." @default.
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• W1968596937 title "Nitrogen stable isotopes in the shell of Mercenaria mercenaria trace wastewater inputs from watersheds to estuarine ecosystems" @default.
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