Delayed maturation of plumage coloration and plumage spottedness in the barn owl (Tyto alba)

被引:19
|
作者
Roulin, A [1 ]
机构
[1] Univ Bern, Dept Zool, CH-3032 Hinterkappelen, Switzerland
来源
JOURNAL FUR ORNITHOLOGIE | 1999年 / 140卷 / 02期
关键词
moult; plumage polymorphism; sexual dimorphism;
D O I
10.1007/BF01653598
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
The Barn Owl (Tyto alba) varies in plumage from dark reddish-brown to white, and from heavily marked with black spots to immaculate. Males are commonly lighter coloured and less spotted than females. I assessed whether male and female Barn Owls delay the full expression of plumage coloration and spottedness to the second year of life. In Switzerland, I quantified the two traits of birds captured at the nestling stage, first, second and third year of life. Males and females became lighter coloured only from the first to the second year. Males became less spotted only from the first to the second year, and females less spotted from the nestling stage to the first year but more spotted from the first to the second year. Females were also similarly spotted at the second and third year of age. By cutting off small pieces of feathers of females I could recognize which feathers had later been renewed. After a complete moult old females did not change in plumage characteristics.
引用
收藏
页码:193 / 197
页数:5
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