洋县野生朱Huan的繁殖

朱鹮(Nipponia nippon)的繁殖状况 ,尤其是种群数量的变化 ,一直受到国内外的关注。本文收集分析了 1 981～ 1 997年 1 7年朱繁殖资料 ,进一步研究了朱的繁殖及其数量 ,以期为朱保护 ,采取行之有效的措施 ,提供科学依据。1　研究方法自 1 981年朱被重新发现后 ,至 1 997年 ,每年3～ 6月繁殖期 ,固定人员 ,2～ 3人为 1组 ,在每个巢区设立观察点 ,进行跟踪观察 ,并详细统计每窝产卵数、孵化数、雏鸟成活数和死亡数。并结合平常的跟踪监护 ,调查分析种群数量动态 ,统计成鸟死亡数 ,然后进行整理分析。2　结果与讨论2 .1　种群数量1 98…

Reproduction of the Wild Nipponia Nippon in Yang County

A total of 236 eggs were laid by the population of the wild crested ibis ( Nipponia nippon ) in 72 nests in Yang County,Shaanxi Province,China,from 1981 to 1997,with an average of 3 3 eggs per nest.Among the eggs,169 nestlings were hatched,accounting for 71 6% of the total;and 129 young birds grew up and flew from their nests,accounting for 76.3% of all the nestlings.Since 1981,133 birds have been brought up in the county.The birds have established 27 breeding sites in the county,with the number of breeding couples increasing from 2 pairs in 1981 to 10 pairs in 1997.The birds mature at 2 years old,either male or the famele is 2 years old,The maximum age difference between the 2 sides of a couple is 2 years.