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Foods of Buller’s Shearwaters ( Puffinus bulleri ) associated with driftnet fisheries in the central North Pacific Ocean

  • Publication Type

    Journal Article

  • Publication Year

    1998

  • Author(s)

    P. Gould; P. Ostrom; W. Walker

  • Journal Name

    Notornis

  • Volume, Issue

    45, 2

  • Pagination

    81-92

  • Article Type

    paper

Keywords

Buller's Shearwater; fisheries associations; food; Puffinus bulleri; stable isotopes of nitrogen


Foods of Buller’s Shearwaters ( Puffinus bulleri ) associated with driftnet fisheries in the central North Pacific Ocean

Notornis, 45 (2), 81-92

P. Gould; P. Ostrom; W. Walker (1998)

Article Type: paper

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We examined digestive tract contents and stable nitrogen isotope ratios (15N) in breast muscles of Buller’s Shearwaters (Puffinus bulleri) salvaged from squid and large- mesh driftnets in the central North Pacific Ocean. The epipelagic Pacific Saury (Cololabis saira) was the predominant prey, making up 71% of prey mass in digestive tracts. The remainder of the diet included small numbers of crustaceans, small fishes, and squids. The high degree of specialization in the diet seems to indicate that in the North Pacific, Buller’s Shearwaters usually feed at or near the water surface and rarely pursue food under water. Although these birds have been observed feeding on scraps from fishing vessels, our data suggest that offal comprises less than 10 percent of the diet. Stable nitrogen isotope values provided quantified information on the timing of arrival of migrants into the North Pacific.