Oecologia

, Volume 147, Issue 3, pp 391–395

Turnover rates of nitrogen stable isotopes in the salt marsh mummichog, Fundulus heteroclitus, following a laboratory diet switch

  • John Logan
  • Heather Haas
  • Linda Deegan
  • Emily Gaines
Ecophysiology

DOI: 10.1007/s00442-005-0277-z

Cite this article as:
Logan, J., Haas, H., Deegan, L. et al. Oecologia (2006) 147: 391. doi:10.1007/s00442-005-0277-z

Abstract

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 δ15 N 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 liver and –1.0 and 0.2‰ for muscle. This is the first experiment to demonstrate a significant variation in δ15 N turnover between liver and muscle tissues in a fish species.

Keywords

DiscriminationLiverMetabolism15 NTrophic level

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • John Logan
    • 1
    • 2
  • Heather Haas
    • 1
    • 3
  • Linda Deegan
    • 1
  • Emily Gaines
    • 1
  1. 1.The Ecosystems CenterMarine Biological LaboratoryWoods HoleUSA
  2. 2.Zoology DepartmentUniversity of New HampshireDurhamUSA
  3. 3.National Marine Fisheries ServiceWoods HoleUSA