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Differences in stable isotope ratios of Dall’s porpoises ( Phocoenoides dalli ) between coastal and oceanic areas of the North Pacific
Author(s) -
OHIZUMI HIROSHI,
MIYAZAKI NOBUYUKI
Publication year - 2010
Publication title -
fisheries oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 80
eISSN - 1365-2419
pISSN - 1054-6006
DOI - 10.1111/j.1365-2419.2010.00547.x
Subject(s) - pelagic zone , porpoise , oceanography , benthic zone , isotopes of carbon , population , stable isotope ratio , pacific ocean , environmental science , isotope analysis , δ15n , food web , δ13c , geology , total organic carbon , predation , ecology , biology , paleontology , physics , demography , quantum mechanics , harbour , sociology , computer science , programming language
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 δ 15 N was observed, δ 13 C 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.