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Movements and activities of male black-tailed gulls in breeding and sabbatical years

Kazama, Kentaro; Hirata, Kazuhiko; Yamamoto, Takashi; Hashimoto, Hiroshi; Takahashi, Akinori; Niizuma, Yasuaki; Trathan, Philip N.; Watanuki, Yutaka. 2013 Movements and activities of male black-tailed gulls in breeding and sabbatical years. Journal of Avian Biology, 44 (6). 603-608. 10.1111/j.1600-048X.2013.00103.x

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Abstract/Summary

Long-lived animals sometimes skip one or more breeding seasons; however, little is known about their movements and activities during such ‘sabbatical’ periods. Here we present novel data on year-round movements and activities of two male black-tailed gulls Larus crassirostris during a sabbatical year. We compare the data with those in a year when they bred and with those of two other breeding males. The year-round migration routes of two sabbatical males were consistent with those of the breeding males: they returned to the breeding area but did not visit the colony in the sabbatical year. They landed more frequently on water (a potential index of foraging effort) during the non-breeding autumn and winter prior to the sabbatical year than before breeding. Sabbatical gulls may forage more intensively to recover body condition immediately after breeding.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1600-048X.2013.00103.x
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
ISSN: 09088857
Additional Keywords: foraging, migration, sabbatical, black-tailed gulls, Japan
Date made live: 15 Jul 2013 14:34 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/502591

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