| Maternal meddling in neonatal sharks: implications for interpreting stable isotopes in young animals. | |
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MedLine Citation:
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PMID: 21452377 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Stable isotopes of neonatal vertebrates reflect those of their mother's diet and foraging location. Evaluating feeding strategies and habitat use of neonates is consequently complicated by the maternal isotopic signal and its subsequent elimination with growth. Thus, methods that measure the loss of the maternal signal, i.e. when the isotopic signal of a neonate reflects its own diet, are needed. Values of δ(13) C and δ(15) N were measured in liver and muscle tissues of <1 year old bull (Carcharhinus leucas) and Atlantic sharpnose (Rhizoprionodon terraenovae) sharks and related to age using, total length, date sampled and umbilical scar stage (USS). We observed a decline in δ(13) C and δ(15) N values with age that was different among species, similar among isotopes, and greater in liver than in muscle; highlighting that retention of the maternal signal is dependent on species-specific life history and tissue characteristics. USS was most effective for assessing the loss of the maternal isotopic signal in the faster growing Atlantic sharpnose shark, but was less effective for the slower growing bull shark. Total length and date sampled were overall less effective and may be more informative for slower growing species when coupled with USS, as variable size at birth and misclassification of animals >1 year old, which remain in nursery habitats, increase the variability of the isotopic values. Consideration of the maternal signal and measuring its loss are thus necessary when analyzing the stable isotopes of young animals, as there is potential to misinterpret feeding strategies, over-estimate trophic position and incorrectly assign carbon source. Copyright © 2011 John Wiley & Sons, Ltd. |
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Authors:
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Jill A Olin; Nigel E Hussey; Mark Fritts; Michelle R Heupel; Colin A Simpfendorfer; Gregg R Poulakis; Aaron T Fisk |
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Publication Detail:
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Type: Journal Article Date: 2011-03-15 |
Journal Detail:
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Title: Rapid communications in mass spectrometry : RCM Volume: 25 ISSN: 1097-0231 ISO Abbreviation: Rapid Commun. Mass Spectrom. Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-03-31 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8802365 Medline TA: Rapid Commun Mass Spectrom Country: England |
Other Details:
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Languages: eng Pagination: 1008-16 Citation Subset: IM |
Copyright Information:
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Copyright © 2011 John Wiley & Sons, Ltd. |
Affiliation:
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Great Lakes Institute for Environmental Research, University of Windsor, 401 Sunset Avenue, Windsor, Ontario, N9B 3P4, Canada. olin@uwindsor.ca. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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