白腹短翅鸲雄鸟的羽毛延迟成熟现象

20 0 3年 6月 ,在甘肃省莲花山自然保护区观察到白腹短翅鸲 (Hodgsoniusphaenicuroides)雄鸟的羽毛延迟成熟现象。研究发现 ,亚成体雄鸟体羽暗淡 ,为似雌鸟样的褐色 ,但仍然可以繁殖。声谱分析表明 ,成体雄鸟与亚成体雄鸟的鸣声结构非常相似 ,而且两者在巢址、巢材、窝卵数、卵色、卵大小等巢卵特征上也非常一致。通过对中国科学院动物研究所标本馆 1 1 7只白腹短翅鸲雄鸟标本的测量 ,发现成体雄鸟的翅长和尾长明显大于亚成体 (t 检验 ,P <0. 0 0 1 )。在 1 93 0年北平东陵同一繁殖季节采集的 1 0 8只雄鸟标本中 ,亚成体雄鸟所占的比例为 1 9%。

Delayed Plumage Maturation in Male White-bellied Redstart( Hodgsonius phaenicuroides )

In June 2003, the delayed plumage maturation in male White-bellied Redstart (Hodgsonius phaenicuroides) was studied at the Lianhuashan Nature Reserve, Gansu Province. The study found that sub-adult males could breed in dull brown female-like plumage. Adult and sub-adult males have similar song structures and same nest and egg characteristics of nest site, nest materials, clutch size, egg color and egg size. Having measured 117 specimens collected in the museum of Institute of Zoology, we found that the wings and tail lengths of the adult males were significantly larger than those of sub-adult males (t-test, P<0.001). In the breeding season of 1930, the sub-adult males accounted for 19% of 108 specimens collected at Dongling in Peking.