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Stable carbon ( δ13 C) and nitrogen ( δ15 N) isotopic compositions of bone and dentine collagen extracted from museum specimens have been widely used to study the paleoecology of past populations. Due to possible systematic differences in stable isotope values between bone and dentine, dentine values need to be transformed into bone-collagen equivalent using a correction factor to allow comparisons between the two collagen sources. Here, we provide correction factors to transform dentine  δ13 C and  δ15 N values into bone-collagen equivalent for two toothed whales: narwhal and beluga. We sampled bone and dentine from the skulls of 11 narwhals and 26 belugas. In narwhals, dentine was sampled from tusk and embedded tooth; in belugas, dentine was sampled from tooth.  δ13 C and  δ15 N were measured, and intra-individual bone and dentine isotopic compositions were used to calculate correction factors for each species. We detected differences in  δ13 C and  δ15 N. In both narwhals and belugas, we found lower average  δ13 C and  δ15 N in bone compared with dentine. The correction factors provided by the study enable the combined analysis of stable isotope data from bone and dentine in these species.

isotopes in environmental and health studies

Combining  δ                  13 C and  δ                  15 N from bone and dentine in marine mammal palaeoecological research: insights from toothed whales