黄腹角雉的种群数量及其结构研究

THE STUDIES OF THE POPULATION NUMBER AND STRUCTURE OF CABOT'S TRAGOPAN (Tragopan caboti)

1983—1986年在浙江省乌岩岭自然保护区,应用标图法和线路统计法,对野生黄腹角雉种群、数量进行了统计分析。结果表明冬季种群约50只。种群数量有明显的季节变动:繁殖后期数量增加,秋末冬初开始明显下降。黄腹角雉繁殖力低,卵的损失率高,使种群数量上升十分缓慢。成体性比接近1:1,在各样区之间略有差异。在性比偏离1:1较大的样区,亚成体比例较高。

The population number, seasonal flunctuation, the sexual ratio and the age structure of Trago pan caboti were analized based on the data obtained from 1983 to 1986 in Wu Yan Ling Reserve, Zhejiang Province. The mapping method and the line transect were used in the census. It is concluded that the number of wild Tragopan caboti are about 50 in winter in Wu Yan Ling Reserve. The sexes and ages of the population of Cabot's Tragopan are different: female is about 49.23%, male 50.68%, adult 98.49% and young 21.51%. The proportions of the young birds are related to the sexual ratio of adults in the specific samples in some way. The clutch size is 3.5, hatching ratio are very low, but the loss ratio of eggs are incredible high in breeding season. The Tragopan caboti's population had obvious seasonal fluctuation in Wu Yan Ling Reserve. The population number is the lowest in winter, the highest in later breeding season. The main reason for fluctuation may be the hatching and the death of the young birds. It is suggest that the key to prevent the Tragopan caboti from extinction is to ensure the hatching ratio and the survival rate of young birds in the wild.