- 期刊
- OpenAccess
台灣6種鷹屬猛禽尾羽斑紋比較
Rectrices Pattern Comparison among Six Accipiter Raptors in Taiwan
摘要
鷹屬（Accipiter spp.）是日猛禽中種數最多的一屬，全世界共有46種，台灣有6種，包括蒼鷹（A. gentilis）、北雀鷹（A. nisus）、鳳頭蒼鷹（A. trivirgatus）、松雀鷹（A. virgatus）、日本松雀鷹（A. gularis）、赤腹鷹（A. soloensis），是台灣猛禽中種數最多的屬。這6種鷹的尾羽都有橫紋且大同小異，但細看後可察覺一些特別之處，例如「尾羽異紋」現象（rectrices pattern dissimilarity），多數發生在最外側尾羽，少數發生在中央尾羽。本文以數位照片為材料，描述這6種鷹的尾羽斑紋，並整理與比較其異同，且從相異之處歸納出可作為種間辨識的檢索關鍵。文中最後探討尾羽斑紋與尾羽異紋在生態演化上的意義，可能的理由是增強在森林中的掩蔽效果。
並列摘要
Accipiter is the most numerous genus in diurnal raptors. There are 6 species of Acipiters in Taiwan: Northern Goshawk (A. gentilis), Eurasian Sparrowhawk (A. nisus), Crested Goshawk (A. trivirgatus), Besra (A. virgatus), Japanese Sparrowhawk (A. gularis) and Chinese Goshawk (A. soloensis). They all share a common barred retrices pattern yet each has its own pattern dissimilarity. The pattern dissimilarities exist mostly on the outermost rectrices with few on the central rectrices. In this report, I described the rectrices patterns of these 6 Accipiters in detail based on digital photos collected. I concluded that some rectrices pattern differences between species are useful keys for identification. The possible ecological reason for the rectrices pattern dissimilarity is to enhance the overall body concealment effect, especially in the forest environment.