Stable isotopes, ecological integration and environmental change: wolves record atmospheric carbon isotope trend better than tree rings

Citation:
Bump, JK, Fox-Dobbs K, Bada JL, Koch PL, Peterson RO, Vucetich JA.  2007.  Stable isotopes, ecological integration and environmental change: wolves record atmospheric carbon isotope trend better than tree rings. Proceedings of the Royal Society B-Biological Sciences. 274:2471-2480.

Date Published:

Oct

Keywords:

animal, bone-collagen, climate-change, co2, delta C-13, delta-c-13, ecological integrator, ecology, food-web, ice-core, late pleistocene, palaeoenvironment, southern california, stable isotopes, trophic shift, wolf

Abstract:

Large-scale patterns of isotope ratios are detectable in the tissues of organisms, but the variability in these patterns often obscures detection of environmental trends. We show that plants and animals at lower trophic levels are relatively poor indicators of the temporal trend in atmospheric carbon isotope ratios (delta C-13) when compared with animals at higher trophic levels. First, we tested how differences in atmospheric delta C-13 values were transferred across three trophic levels. Second, we compared contemporary delta C-13 trends (1961 - 2004) in atmospheric CO2 to delta C-13 patterns in a tree species ( jack pine, Pinus banksiana), large herbivore (moose, Alces alces) and large carnivore (grey wolf, Canis lupus) from North America. Third, we compared palaeontological (approx. 30 000 to 12 000 14 C years before present) atmospheric CO2 trends to delta C-13 patterns in a tree species (Pinus flexilis, Juniperus sp.), a megaherbivore (bison, Bison antiquus) and a large carnivore (dire wolf, Canis dirus) from the La Brea tar pits ( southern California, USA) and Great Basin (western USA). Contrary to previous expectations, we found that the environmental isotope pattern is better represented with increasing trophic level. Our results indicate that museum specimens of large carnivores would best reflect large-scale spatial and temporal patterns of carbon isotopes in the palaeontological record because top predators can act as ecological integrators of environmental change.

Notes:

n/a

Website

DOI:

10.1098/rspb.2007.0700