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Diet discrimination factors are inversely related to delta N-15 and delta C-13 values of food for fish under controlled conditions

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dc.contributor Australian Institute Of Marine Science
dc.contributor University Of Windsor
dc.contributor Great Lakes Inst Environm Res
dc.contributor Dept Biol Sci
dc.contributor Australian Inst Marine Sci
dc.contributor Univ Windsor
dc.contributor Australian Institute Of Marine Science (aims) en FISK, AARON T. DENNIS, CAROLINE A. MACNEIL, M. AARON ROSATI, JENNIFER Y. PITCHER, TREVOR E. 2013-02-28T06:50:30Z 2017-03-21T01:17:36Z 2017-03-21T01:17:36Z 2019-07-08T02:28:05Z 2017-03-21T01:17:36Z 2013-02-28T06:50:30Z 2013-02-28T06:50:30Z 2019-07-08T02:28:05Z 2010-12-01
dc.identifier 8677 en
dc.identifier.citation Dennis CA, MacNeil MA, Rosati JY, Pitcher TE and Fisk AT (2010) Diet discrimination factors are inversely related to delta N-15 and delta C-13 values of food for fish under controlled conditions. Rapid Communications in Mass Spectrometry. 24: 3515-3520. en
dc.identifier.issn 0951-4198
dc.description.abstract A recent literature review reported negative relationships between diet discrimination factors (DDFs X-fish - X-food; X = delta N-15 or delta C-13) and the values of delta N-15 and delta C-13 in the food of wild organisms but there has been no laboratory-based confirmation of these relationships to date. Laboratory reared guppies (Poecilia reticulata) fed a series of diets with a range of delta C-13 (-22.9 to -6.6%) and delta N-15 (6.5 to 1586%) values were used to magnify diet-tissue dynamics in order to calculate DDFs once the fish had achieved equilibrium with each of the diets. Values of DDFs range widely for delta N-15 (7.1 to -849%) and delta C-13 (1.1 to -7.0%) and showed a strong negative correlation with the stable isotope value in the food for delta N-15 (slope = -0.59 +/- 0.02, r(2) = 0.95) and delta C-13 (slope = -0.56 +/- 0.02, r(2) = 0.94). Based on these relationships, the magnitude of DDF change over environmentally relevant values of delta N-15 or delta C-13 would be significant and could confound the interpretation of stable isotopes in the environment. Using highly enriched experimental diets, our study adds to a growing number of studies that undermine the consistent trophic enrichment paradigm with results that demonstrate the currently poor mechanistic understanding of how DDFs arise. The results of our study highlight that the magnitude of the stable isotope values in prey must be considered when choosing DDF values. Future laboratory studies should therefore be directed at uncovering the mechanistic basis of DDFs and, like others before, we recommend the determination of diet-dependent DDFs under laboratory conditions before modeling dietary proportions or calculating trophic positions. Copyright (C) 2010 John Wiley & Sons, Ltd.
dc.description.sponsorship Funding for this project was provided by NSERC Discovery grants to T.E.P. and A.T.F. and NSERC-USRA and NSERC-PGM to C.A.D. Sandra Ellis provided advice and assistance on stable isotope analysis. The experiments conducted in this study conformed to the guidelines outlined by the Canadian Council on Animal Care and were approved by the Animal Care Committee at the University of Windsor (AUPP 07-03).
dc.language English
dc.language en en
dc.relation.ispartof Null
dc.relation.ispartof Rapid Communications in Mass Spectrometry - pages: 24: 3515-3520 en
dc.subject Assumptions
dc.subject Enrichment
dc.subject Models
dc.subject Chemistry
dc.subject Nitrogen Stable-isotopes
dc.subject Biochemical Research Methods
dc.subject Trophic Position
dc.subject Chemistry, Analytical
dc.subject Animal Ecology
dc.subject N-15
dc.subject Metabolic Turnover
dc.subject Spectroscopy
dc.subject Fractionation
dc.subject Carbon
dc.subject Biochemistry & Molecular Biology
dc.title Diet discrimination factors are inversely related to delta N-15 and delta C-13 values of food for fish under controlled conditions
dc.type journal article en
dc.identifier.doi 10.1002/rcm.4807
dc.identifier.wos WOS:000284174300003

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