摘要
对高寒草甸地面营巢的小云雀 (Alaudagulgula)和灌丛筑巢的黄嘴朱顶雀 (Acanthisflavirostris)繁殖方式的研究表明 :①小云雀孵化异步性较弱 (1d) ;平均卵重与产卵顺序不显著相关 ,但最后 1枚卵最重 ;出壳顺序与雏鸟生长率极显著正相关 (P <0 0 1) ;出壳顺序对幼鸟的雏期和离巢体重无显著影响 (P >0 0 5 )。②黄嘴朱顶雀孵化异步性较强 (2～ 3d) ;平均卵重与产卵顺序显著正相关 (P <0 0 5 ) ,最后 1枚卵最重 ,第 1枚次之 ;出壳顺序对雏鸟生长率、雏期和离巢体重均无显著影响 (P >0 0 5 )。结果分析表明 ,2种雀形目鸟类都选择了异步孵化和加强窝雏数对策的繁殖模式。
Data were collected from small skylarks (Alauda gulgula) and twits (Acanthis flavirostris) during the reproduction seasons of 1998-1999 in alpine meadow in order to test and confirm their reproductive patterns.The results were showed:①In the small skylarks,the level of hatching asynchrony was low (1?d);a egg mass did not consistently vary with the laying order,but the last-laid egg mass was maximal;the hatch order had a significant positive impact on the nestling growth rate (P<0.01) and had little impact on the fledged mass and nestling period of young (P>0.05).②In the twits,the level of hatching asynchrony was higher asynchronously (2-3?d);the egg mass increased significantly with the laying order (P<0.05);the hatch order had little impact on the growth,fledged mass and nestling period (P>0.05).The results analysis suggests that the small skylarks and twits in alpine meadow select both hatching asynchrony and brood enlarge strategy as the breeding patterns.
基金
国家自然科学基金资助项目 ( 396 70 12 6
39870 12 1)
