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Résumé :
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When facing changes in the available forage fish composition and distribution, seabirds are expected to respond by switching their prey species and/or adjusting their key foraging areas. We studied chick-rearing Rhinoceros Auklets Cerorhinca monocerata at Teuri Island, Japan, across three successive years. We examined inter-annual and seasonal changes in their prey species by sampling bill-loads fed to chicks, and surveyed their foraging areas using GPS data-loggers. In 2020, auklets foraged on sand lance Ammodytes spp. in shallow coastal areas along the mainland, ~ 150 km from the colony. In 2021 however, they foraged on an alternative prey, age-0 Greenling Pleurogrammus azonus, in cool basin deep waters > 150 km away in the early season, and later switched to Herring Clupea pallasii caught in warm coastal waters. In 2022, they foraged on Anchovy Engraulis japonicus in offshore and coastal waters
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