Wing coloration and courtship behaviour of the damselfly Calopteryx japonica

蜻蜓属（Calopteryxjaponica）蜻蜓的翅膀有两种颜色多态性。未成熟和成熟的雌性的翅膀都有一个棕色，灰色，雌蕊红颜色。未成熟的雄鸟的翅膀也有雌蕊花色素的颜色，但成熟的雄鸟的翅膀有明亮的蓝绿色，androchrome的颜色，这是由于彩虹色的翅膀静脉。我们发现，在他们的领土成年男性攻击其他成熟的男性，但不是女性和未成熟的男性，这表明男性视觉区分androchrome颜色。在选择实验中，我们提出了四种不同的拴系模型的领土男性。领地雄虫攻击成熟雄虫模型，并对成熟雌虫模型表现出生殖行为展示。用灰色喷雾覆盖成熟雄性模型的翅膀，导致领土雄性的攻击行为完全消失。另一方面，翅膀被明亮的蓝绿色颗粒覆盖的雌性模型，从而模仿成熟的男性，受到领土男性的攻击。结果表明，灰蝶翅膀明亮的蓝绿色虹彩是由其翅膀的颜色组成的。日本雄性在雄性领土行为中起着重要的作用。

Damselflies of the genus Calopteryx japonica feature two types of colour polymorphism in their wings. The wings of both immature and mature females have a brown-greyish, gynochrome colour. The wings of the immature male also have the gynochrome colour, but the mature male wings have a bright blue-green, androchrome colour, due to iridescent wing veins. We found that the adult males in their territory attack other mature males, but not females and immature males, suggesting that males visually distinguish the androchrome colour. In choice experiments, we presented four different tethered models to territorial males. The territorial male attacked the mature male model, and showed reproductive behaviour display towards the mature female model. Covering the wings of a mature male model with grey spray resulted in a complete disappearance of the aggressive behaviour of the territorial males. On the other hand, female models with wings covered by bright blue-green particles, thus mimicking a mature male, were attacked by territorial males. The results indicate that the bright blue-green iridescence of the wings of C. japonica males plays a significant role in male territorial behaviour.