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Turnover Rates of Nitrogen Stable Isotopes in the Salt Marsh Mummichog, Fundulus heteroclitus, following a Laboratory Diet Switch
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Turnover Rates of Nitrogen Stable Isotopes in the Salt Marsh Mummichog, Fundulus heteroclitus, following a Laboratory Diet Switch
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Journal Article
Turnover Rates of Nitrogen Stable Isotopes in the Salt Marsh Mummichog, Fundulus heteroclitus, following a Laboratory Diet Switch
2006
Overview
Nitrogen stable isotopes are frequently used in ecological studies to estimate trophic position and determine movement patterns. Knowledge of tissue-specific turnover and nitrogen discrimination for the study organisms is important for accurate interpretation of isotopic data. We measured δ¹⁵N turnover in liver and muscle tissue in juvenile mummichogs, Fundulus heteroclitus, following a laboratory diet switch. Liver tissue turned over significantly faster than muscle tissue suggesting the potential for a multiple tissue stable isotope approach to study movement and trophic position over different time scales; metabolism contributed significantly to isotopic turnover for both liver and muscle. Nitrogen diet-tissue discrimination was estimated at between 0.0 and 1.2‰ for muscle. This is the first experiment to demonstrate a significant variation in δ¹⁵N turnover between liver and muscle tissues in a fish species.
