Volume 48, No. 2

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Seasonal changes in diving and flying activities of Rhinoceros Auklets Cerorhinca monocerata throughout the non-breeding period.


1Department of Polar Science, The Graduate University for Advanced Studies, SOKENDAI, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan (
2National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan


SHIMABUKURO, U. & TAKAHASHI, A. 2020. Seasonal changes in diving and flying activities of Rhinoceros Auklets Cerorhinca monocerata throughout the non-breeding period.. Marine Ornithology 48: 289 - 295

Received 04 May 2020, accepted 29 July 2020

Date Published: 2020/10/15
Date Online: 2020/10/14
Key words: Seabird, foraging, behavioral time budgets, migration, Sea of Okhotsk, molt


To understand how migratory seabirds meet the energetic challenges associated with wing molt and wintering, a full annual cycle behavioral study is needed. We studied the diving and flying activities of three Rhinoceros Auklets Cerorhinca monocerata migrating in the northwestern Pacific. The auklets decreased daily flight time and dive depth for seven weeks from the end of summer, presumably associated with primary feather molt. In winter, they increased dive depth (~81 m) and daily dive time. We suggest that Rhinoceros Auklets adjust their diving and flying behaviors in response to wing molt and energy demands in winter.


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