Living to the range limit: consumer isotopic variation increases with environmental stress.
Carl J ReddinNessa E O'ConnorChris HarrodPublished in: PeerJ (2016)
Individuals at higher stress levels appear to be less discriminating in diet, likely because of abiotic forcing, which decreases both consumer mobility and the availability of a preferred resource. Abiotic stress might be expected to increase trophic variation in other selective dietary generalist species. Where this coincides with a lower physiological condition may be a direct factor in setting their range limit.