Document Detail


Expression of maternal isotopes in offspring: implications for interpreting ontogenetic shifts in isotopic composition of consumer tissues.
MedLine Citation:
PMID:  17558752     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
When evaluating ontogenetic shifts in isotopic composition of consumer tissues within the context of a dietary analysis, the isotopic starting point of consumers in the population should not be ignored. Neonate isotopic composition may be different from that of juveniles and adults; in general, neonate tissues are built from maternal resources rather than food resources. Thus, the range of isotope values observed within a population of consumers may be significantly impacted by consumer isotope ratios at birth. Long-term goals of my research involve the use of stable isotopes to assess the role diet plays in driving population level differences in life history and demography observed among three pigmy rattlesnake (Sistrurus miliarius; family Viperidae) populations. For meaningful interpretation of field-collected data, it was important to determine starting (i.e., at birth) isotopic compositions of rattlesnakes from the study populations. We quantified isotopic composition of pregnant pigmy rattlesnake scale tissue, isotopic composition of neonate scale tissue and the degree that neonate scale tissue isotopic composition reflected the isotopic composition of maternal scale tissue. Collectively, neonate isotopic composition was highly variable among-litters; average litter delta(13)C values spanned 7 per thousand and average litter delta(15)N values spanned 2.8 per thousand. Over 95 % of the variation in offspring isotopic composition was expressed among litters. Thus, high levels of among-litter isotopic variation were largely due to the retention of a maternal signal. Results of the enclosure study suggest that highly variable isotopic signatures in young animals within field populations could easily reflect the retention of a maternal signal rather than differences in resource utilisation among younger snakes.
Authors:
Melissa Ann Pilgrim
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Isotopes in environmental and health studies     Volume:  43     ISSN:  1025-6016     ISO Abbreviation:  Isotopes Environ Health Stud     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-06-11     Completed Date:  2007-08-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9602611     Medline TA:  Isotopes Environ Health Stud     Country:  England    
Other Details:
Languages:  eng     Pagination:  155-63     Citation Subset:  IM    
Affiliation:
University of Arkansas, Department of Biological Sciences, Fayetteville, Arizona 72701, USA. pilgrim@srel.edu
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MeSH Terms
Descriptor/Qualifier:
Animal Nutritional Physiological Phenomena
Animals
Carbon Isotopes / metabolism
Crotalus / growth & development*,  metabolism*
Diet*
Evolution
Female
Nitrogen Isotopes / metabolism
Population Dynamics
Viviparity, Nonmammalian / physiology*
Chemical
Reg. No./Substance:
0/Carbon Isotopes; 0/Nitrogen Isotopes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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