Ten years of experimental animal isotopic ecology
Article first published online: 16 JAN 2009
© 2009 The Authors. Journal compilation © 2009 British Ecological Society
Volume 23, Issue 1, pages 17–26, February 2009
How to Cite
Wolf, N., Carleton, S. A. and Martínez del Rio, C. (2009), Ten years of experimental animal isotopic ecology. Functional Ecology, 23: 17–26. doi: 10.1111/j.1365-2435.2009.01529.x
- Issue published online: 16 JAN 2009
- Article first published online: 16 JAN 2009
- Received 16 September 2008; accepted 19 November 2008Handling Editor: David Raubenheimer
- experimental isotopic ecology;
- stable isotopes;
- trophic ecology
- 1Ten years ago Gannes et al. (1997, Stable isotopes in animal ecology: assumptions, caveats, and a call for laboratory experiments. Ecology, 78, 1271–1276, 1998) identified four major areas requiring further research in experimental animal isotopic ecology: (i) the dynamics of isotopic incorporation, (ii) mixing models, (iii) the problem of routing, and (iv) trophic discrimination factors.
- 2Differences in isotopic incorporation rates among tissues seem to be explained by variation in protein turnover. The application of multi-compartment models to isotopic incorporation data has revealed that different inferences can be derived between these and one-compartment models.
- 3A variety of mixing models of varying degrees of complexity and realism are used to find the contribution of isotopic sources to the elements in an organism's tissues. The use of these models demands the use of tissue to diet discrimination factors that are rarely measured experimentally.
- 4Mixing models assume that assimilated nutrients are disassembled into their elemental components and that these elements are reassembled into biomolecules. This assumption is unrealistic as macromolecules are routed differentially into tissues. Isotopic routing is an area that isotopic ecologists have neglected in their experimental and modelling research.
- 5Isotopic ecologists are just beginning to understand why 15N biomagnifies along trophic chains, and to explore the factors that determine the degree of 15N biomagnification. We review the hypotheses that explain why 15N biomagnifies up trophic chains.
- 6The use of compound-specific isotopic analyses is opening new fruitful areas of research at the intersection of nutritional and isotopic ecology.