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<p>While many long-distance migratory birds are experiencing severe population declines, some species showed abundance increases and range expansions. Knowledge of migratory routes may provide key insights into these variations of population dynamics among species. In contrast to the Nearctic and Western Palearctic flyways, fewer migratory routes of songbird species in the East Asian–Australasian Flyway have been studied so far. In this study, we tracked the migratory routes of two songbird species, Narcissus Flycatcher (<i>Ficedula narcissina</i>) and Amur Stonechat (<i>Saxicola stejnegeri</i>), which breed in Hokkaido, northern Japan, using miniaturized light-level geolocators. As a control, we only color-ringed individuals from the same populations without deploying geolocators. We found no negative effects of carrying a geolocator throughout the year on the return rates to the breeding areas. Both species spent approximately 1.5–2.0 months migrating from Japan to Southeast Asia in autumn. Narcissus Flycatchers exhibited a clockwise loop migration between Japan and Southeast Asia by following an archipelago-based southern route in autumn, passing through the northern Philippines, to reach Borneo or eastern Java. They took a mainland route along the eastern Chinese coastline to return to southern Japan in spring. Amur Stonechats, in contrast, migrated between breeding grounds and Southeast Asian wintering grounds via China in both seasons. Season- and species-specific selection of migration routes may depend on evolutionary histories, different ecological requirements, and seasonal time constraints. Notably, stopover sites were found in both species at eastern Chinese coastal lines indicating their high biological significance in this flyway.</p>

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Loop vs. same route migrations of two songbird species between Japan and Southeast Asia

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Yuichi Yamaura,
  • Heiko Schmaljohann,
  • Akira Unno,
  • Kazuhiro Kawamura,
  • Munehiro Kitazawa,
  • Shigeho Sato,
  • Daisuke Aoki,
  • Yuji Okahisa,
  • Masayuki Senzaki

摘要

While many long-distance migratory birds are experiencing severe population declines, some species showed abundance increases and range expansions. Knowledge of migratory routes may provide key insights into these variations of population dynamics among species. In contrast to the Nearctic and Western Palearctic flyways, fewer migratory routes of songbird species in the East Asian–Australasian Flyway have been studied so far. In this study, we tracked the migratory routes of two songbird species, Narcissus Flycatcher (Ficedula narcissina) and Amur Stonechat (Saxicola stejnegeri), which breed in Hokkaido, northern Japan, using miniaturized light-level geolocators. As a control, we only color-ringed individuals from the same populations without deploying geolocators. We found no negative effects of carrying a geolocator throughout the year on the return rates to the breeding areas. Both species spent approximately 1.5–2.0 months migrating from Japan to Southeast Asia in autumn. Narcissus Flycatchers exhibited a clockwise loop migration between Japan and Southeast Asia by following an archipelago-based southern route in autumn, passing through the northern Philippines, to reach Borneo or eastern Java. They took a mainland route along the eastern Chinese coastline to return to southern Japan in spring. Amur Stonechats, in contrast, migrated between breeding grounds and Southeast Asian wintering grounds via China in both seasons. Season- and species-specific selection of migration routes may depend on evolutionary histories, different ecological requirements, and seasonal time constraints. Notably, stopover sites were found in both species at eastern Chinese coastal lines indicating their high biological significance in this flyway.