Reintroduction and successful re-establishment of a breeding population of the Oriental White Stork <i>Ciconia boyciana</i> in Japan

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  • EZAKI Yasuo
    Graduate School of Regional Resource Management, University of Hyogo Division of Ecology, Hyogo Park of the Oriental White Stork
  • OHSAKO Yoshito
    Graduate School of Regional Resource Management, University of Hyogo Division of Ecology, Hyogo Park of the Oriental White Stork

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Other Title
  • 野生復帰事業によるコウノトリ<i>Ciconia boyciana</i>繁殖個体群の再生
  • 野生復帰事業によるコウノトリCiconia boyciana繁殖個体群の再生
  • ヤセイ フッキ ジギョウ ニ ヨル コウノトリ Ciconia boyciana ハンショク コタイグン ノ サイセイ

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Abstract

<p>Reintroduction of the Oriental White Stork Ciconia boyciana in Tajima District, northern Hyogo Prefecture, Japan began in 2005. By June 2017 the population had exceeded 100 individuals including 12 breeding pairs, one of which fledged young in Tokushima Prefecture, on Shikoku Island. In this paper, we describe the process of reintroduction and establishment of the stork population. From 2005 to 2017, 51 captive bred birds were released, 136 birds fledged in the wild and two immigrated from the Asian continent bringing the population to 189 birds, of which 119 (60%) survive now in the wild in Japan. The characteristic features of this new population are: more than half are immature birds younger than three years old; 80% are solitary floaters including many solitary adults of both sexes. The sex ratio is greatly skewed toward females caused by the skew among fledglings. The higher survival rate of females compared with males seems to have caused this, but it is not clear if mortality in the wild is higher among males than females because direct impacts, both positive and negative, affect the storks inhabiting villages near human residences.</p>

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