Size Hierarchy Caused by Hatching Asynchrony in the Bull-headed Shrike <i>Lanius bucephalus</i> on Minami-daito Island

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  • Matsui Shin
    Department of Biology and Geosciences, Graduate School of Science, Osaka City University
  • Tsuchiya Yuko
    Department of Biology and Geosciences, Graduate School of Science, Osaka City University
  • Takagi Masaoki
    Department of Biology and Geosciences, Graduate School of Science, Osaka City University
  • Hisaka Mariko
    Department of Biology and Geosciences, Graduate School of Science, Osaka City University

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  • 南大東島のモズ<i>Lanius bucephalus</i> の非同時孵化による体サイズ格差
  • Size Hierarchy Caused by Hatching Asynchrony in the Bull-headed Shrike Lanius bucephalus on Minami-daito Island

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Abstract

The hatching pattern of many altricial passerine birds is asynchronous. We describe the degree of hatching asynchrony of each brood and the resulting size hierarchy at five days after the first egg hatched in the Bull-headed Shrike Lanius bucephalus on Minami-daito Island, Japan. Comparison of body mass ratios of each nestling to the largest nestling in a brood at five days after the first egg hatched showed that there was little overlap in terms of size among the nestlings hatched on the same day as the first egg (95% CI: 0.94–0.98), those hatched one day later (0.73–0.83), and those hatched two or more days later (0.52–0.72). We suggest that the size hierarchy caused by hatching asynchrony is detectable from five days after first egg hatched.

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