トカラ列島臥蛇島でみられたムラサキツバメ秋の移動集団
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概要
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In southern mainland Japan-Honshu, Shikoku, and Kyushu-the Powdered Oakblue (Narathura bazalus) lycaenid butterflies overwinter as adults in aggregations. Some occasionally appear in autumn as stray visitors on many of the Nansei Islands including those where no food-plants grow. This article reports the first confirmed mass migration-like flight of the species observed on Gaja-Jima (29°54'N, 129°32'E), an islet in the Nansei Islands. The flight was observed around sunset on 3 October 1994, day 27.4 in the moon phase. The observation indicates that the butterflies continued to fly above the sea in darkness illuminated only by starlight.
- 日本鱗翅学会の論文
- 2007-01-10
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