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Strandings of striped dolphins (SD) and short-finned pilot whales (PW) in Hokkaido, northern Japan, are rare but have recently increased, probably due to global warming. We quantified  δ13 C,  δ15 N, and  δ18 O in muscles of SD ( n  = 7) and PW ( n  = 3) stranded in Hokkaido and compared these values with those in muscles (red meat products) of hunted SD and PW in three areas of central and southern Japan.  δ18 O in stranded SD, except for the calf, decreased with increasing body length (BL), whereas  δ13 C increased, with no BL-related changes in  δ15 N. The variability of  δ18 O (range of maximum and minimum) was larger in the stranded SD (7.5 ‰) than of the hunted SD in three areas (0.9, 1.9, and 1.4 ‰), whereas that of  δ15 N was smaller in the stranded SD than in the hunted SD. Similarly, the variability of  δ18 O was larger in the stranded PW in Hokkaido (3.3 ‰) than in the hunted PW in central Japan (1.4 ‰). The larger variability of  δ18 O and smaller variability of  δ15 N in stranded SD imply long-term sojourning in coastal waters and feeding on small amounts of limited prey species at low trophic levels before death.

isotopes in environmental and health studies

Carbon, nitrogen, and oxygen stable isotope ratios of striped dolphins and short-finned pilot whales stranded in Hokkaido, northern Japan, compared with those of other cetaceans stranded and hunted in Japan