山階鳥類研究所研究報告
Online ISSN : 1883-3659
Print ISSN : 0044-0183
ISSN-L : 0044-0183
The Feeding Ecology of Uria lomvia in the Northwestern Bering Sea Region
Haruo OgiTsuneyasu Hamanaka
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1982 年 14 巻 2-3 号 p. 270-280

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The feeding habits of the Thick-billed Murre were studied in the Gulf of Anadyr and the adjacent portion of the Bering Sea during July, 1973; the contents of 369 stomachs were examined. The most important prey was the pelagic amphipod, Parathemisto libellula, which comprised 75.6% of the diet by weight. The overwhelming prevalence of this organism seemed to correlate with the presence of extremely cold water, ranging in temperature from -1.8 to 1 or 2°C, underlying surface waters. These cold waters, resident from the previous winter, may govern the distribution and reproduction of P. libellula.
Other prey species such as capelin (Mallotus villosus) and euphausiids (Thysanoessa longipes, Thy. inermis and Thy. raschii) occurred sporadically in the bird stomachs. The accessibility of these organisms to birds seemed to be localized and patchy.

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© Yamashina Institute for Ornitology
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