TITLE

Contribution of catabolic tissue replacement to the turnover of stable isotopes in Danio rerio

AUTHOR(S)
MacAvoy, Stephen E.; Macko, Stephen A.; Tarboush, Rania A.; Connaughton, Victoria
PUB. DATE
October 2006
SOURCE
Canadian Journal of Zoology;Oct2006, Vol. 84 Issue 10, p1453
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Stable isotopes of carbon, nitrogen, and sulfur in organisms can trace nutrient sources and determine trophic interactions. However, time is required for an organism to reflect the isotopic composition of its diet. The rate at which an organism incorporates the isotopic signature of its food has a growth (k) component and a metabolic tissue replacement (m) component. This study shows that metabolic tissue replacement accounts for between 68% and 80% of the observed changes in isotopic signature in zebra danio (Danio rerio (Hamilton, 1822)) muscle following a dietary shift, with the remainder owing to growth of new tissue. The half-lives of carbon, nitrogen, and sulfur were ~53, ~147 and ~58 days, respectively. This indicates that a significant period of isotopic disequilibria exists before zebra danio resemble dietary isotopic composition. These results show that catabolic replacement of tissue, as well as growth, must be taken into account when predicting the rate of isotope incorporation in warm-water fish. When using isotopic ratios to decipher food webs and trophic interactions, researchers should be aware that the often held assumption of isotopic equilibrium between diet and consumer may be violated.
ACCESSION #
25934407

 

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