| intrapopulation variation in gray wolf isotope (delta(15)n and delta(13)c) profiles: implications for the ecology of individuals. | trophic relationships among organisms in terrestrial boreal ecosystems define ecological communities and are important in determining dynamics of energy flow and ecosystem function. we examined trophic relationships between the gray wolf (canis lupus) and 18 mammalian species from the boreal forest of central saskatchewan, canada, using delta(13)c and delta(15)n stable isotope values measured in guard hair samples. variance in isotope values for wolves and other carnivores was investigated as a ... | 2005 | 15883848 |