A comparison of pre-treatment methods for δ^15 N analysis in mollusk shells

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dc.contributor Donahoe, Rona Jean
dc.contributor Carmichael, Ruth H.
dc.contributor Perez-Huerta, Alberto
dc.contributor.advisor Andrus, C. Fred T.
dc.contributor.author Hansen, Jestina Anne
dc.date.accessioned 2017-03-01T14:39:22Z
dc.date.available 2017-03-01T14:39:22Z
dc.date.issued 2011
dc.identifier.other u0015_0000001_0000557
dc.identifier.other Hansen_alatus_0004M_10693
dc.identifier.uri https://ir.ua.edu/handle/123456789/1062
dc.description Electronic Thesis or Dissertation
dc.description.abstract Two sample preparation methods, acid pretreatment and no pretreatment, for δ^15 N analysis in mollusk shells were compared on sample splits from three common Gulf of Mexico and North Atlantic mollusks (Mercenaria spp., Crassostrea virginica, and Mytilus edulis). In all but one sample, no statistically significant difference (2σ) in δ^15 N values was measured between these two preparation techniques. However, sample splits that were not acid pretreated produced lighter δ^15 N values than their acidified counterparts in 82% of samples studied, and lower N content in small samples correlated with greater differences in method results. In addition, shell biomineralogy directly affected the %N of the samples; calcitic shell material contained greater %N, and produced data with higher analytical precision than aragonitic shell in the analyzed taxa. These data suggest that shell N content controls analytical data precision and that biomineralogy controls shell %N and N content. Within a singe species, N shell content varied as much as 30μg in C. virginica and 24μg in Mercenaria spp., likely as a result of differences in available food supply and N sources to grow-out locations. Because %N can vary greatly among and within species, preliminary analyses are recommended to determine the expected N content in samples and to establish whether omitting acid pretreatment of samples will result in sufficient analytical data precision. N content should also be reported along with analytical error to demonstrate that results are robust.
dc.format.extent 51 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Geology
dc.subject.other Geochemistry
dc.title A comparison of pre-treatment methods for δ^15 N analysis in mollusk shells
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Geological Sciencess
etdms.degree.discipline Geology
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.

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