Journal
FISHERIES OCEANOGRAPHY
Volume 19, Issue 4, Pages 257-261Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2419.2010.00547.x
Keywords
delta 13C; delta 15N; coastal benthic and oceanic pelagic food web; Dall's porpoise; Phocoenoides dalli; stable isotope ratios
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Funding
- Fishery Agency of Japan
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Carbon and nitrogen stable isotope ratios in the muscle of Dall's porpoises were measured. Samples were collected from the catches of the hand harpoon fishery, incidental catches of drift net, and scientific research on the use of drift nets. Samples were from the North Pacific, Sea of Japan, Sea of Okhotsk, and Bering Sea. Although no variation in delta 15N was observed, delta 13C was significantly different between population groups near Japan and the oceanic North Pacific and Bering Sea. The difference may be due not only to local variation in prey species, but also to an overall difference in carbon stable isotope ratios that originate from coastal benthic or oceanic pelagic-based food webs. We differentiated Dall's porpoise population groups from both areas using carbon stable isotope ratios with an error rate of < 5%. Although further study is needed, our results suggest that carbon stable isotope ratios could possibly be an indicator of whether a Dall's porpoise belongs to a coastal benthic or oceanic pelagic food web.
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