ABSTRACT The advantage for camouflage of variation in colour forms (binary, multi, or continuous) is a topic of increasing interest, but there are few long-term studies. We found that the ratios of colour forms of 337 polymorphic Manuka moths (Declana floccosa), recorded at one location, did not change over 42 years. This unexpected stability, in the face of probable bird predation against commoner forms and genetic drift, might result from the moth’s continuous variation that prevents predators forming a specific search image, or an unchanged food supply for the larvae. The flight period change from summer to winter, apparently the first recorded, was possibly driven by wasp (Vespula vulgaris) predation after their arrival about 1980.

中文翻译：

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1974–2016 年，新西兰的 Declana floccosa Walker，1858 年（鳞翅目：尺蠖科）的多晶型稳定性和飞行期改变

摘要 伪装颜色形式（二元、多或连续）变化的优势是一个越来越受关注的话题，但很少有长期研究。我们发现在一个地点记录的 337 种多态麦卢卡蛾 (Declana floccosa) 的颜色形式的比率在 42 年中没有变化。面对可能的鸟类捕食普通形式和遗传漂移，这种意想不到的稳定性可能是由于飞蛾的持续变异导致捕食者形成特定的搜索图像，或者幼虫的食物供应没有变化。从夏季到冬季的飞行期变化，显然是第一次记录，可能是由黄蜂（Vespula vulgaris）在 1980 年左右到达后捕食造成的。