Preference for breeding environment of Daurian Redstart <i>Phoenicurus auroreus</i> in Yatsugatake, Nagano and Takayama, Gifu, Japan

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  • 八ヶ岳周辺と高山市におけるジョウビタキ<i>Phoenicurus auroreus</i>の繁殖環境の選好性
  • 八ヶ岳周辺と高山市におけるジョウビタキPhoenicurus auroreusの繁殖環境の選好性
  • ヤツガタケ シュウヘン ト タカヤマシ ニ オケル ジョウビタキ Phoenicurus auroreus ノ ハンショク カンキョウ ノ セン コウセイ

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Abstract

<p>The Daurian Redstart Phoenicurus auroreus, previously considered only a winter visitor in Japan, was found breeding for the first time in Fujimi-machi Nagano Prefecture, in June 2010. In the ten years since, we have confirmed a total of 137 breeding attempts by Daurian Redstart around Yatsugatake. The species was first found singing in Takayama City, Gifu prefecture, in 2014 since when we have surveyed the area for six years and recorded 174 breeding attempts. Breeding has continued annually and the species is now considered established in both regions. Various aspects of breeding status in each region were compared, these included the surrounding environment, the distance from the forest edge, the frequency or purpose of human use of the buildings where nests were found, nest location, nest height, and elevation. We found that villas and resorts around Yatsugatake and residential areas in Takayama City were used as the main nesting sites. The redstarts selected nesting locations close to forests in both regions. All nests were built on artificial structures including ventilation fan hoods. Nests were often built in box-shaped places or recesses providing shelter from predators. Because the Daurian Redstarts is considered to be adaptable to moderate urbanization, it is expected to expand its distribution in the future into areas close to humans, such as residential areas near forests and urban areas with plenty of greenery.</p>

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