| variability in isotope discrimination factors in coral reef fishes: implications for diet and food web reconstruction. | interpretation of stable isotope ratios of carbon and nitrogen (δ(13)c and δ(15)n) is generally based on the assumption that with each trophic level there is a constant enrichment in the heavier isotope, leading to diet-tissue discrimination factors of 3.4‰ for (15)n (δn) and ∼0.5‰ for (13)c (δc). diet-tissue discrimination factors determined from paired tissue and gut samples taken from 152 individuals from 26 fish species at ningaloo reef, western australia demonstrate a large amount of variab ... | 2010 | 21060681 |