Seasonal change in the song frequency of Jungle Nightjar in the Chichibu Mountains

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  • SAIKI Michio
    The University of Tokyo Chichibu Forest, Graduate School of Agricultural and Life Sciences, The University of Tokyo

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  • 秩父山地におけるヨタカのさえずり頻度の季節変化
  • チチブ サンチ ニ オケル ヨタカ ノ サエズリ ヒンド ノ キセツ ヘンカ

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Abstract

Seasonal change in the song frequency of Jungle Nightjar Caprimulgus indicus was studied in a forest in the Chichibu mountain region in 2014. The song frequency did not differ between the period after sunset and the period before sunrise. Song frequency was high during the pairing, incubation, and early stage of brooding periods. However, as it is difficult to know when the incubation period ends and the early brooding period begins, it is desirable to investigate during the pairing period (about one month after arrival).

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