摘要
对青海省玛多县境内的普通大 (Buteohemilasius)的 14个胃容物和 118个食茧中的猎物逐个分析鉴定 ,共分为 3种类型 :①高原鼠兔 (Ochotonacurzoniae) ,②青海田鼠 (Lasiopodomysfuscus) ,③小型鸟类。分别计算各类猎物出现率 (pi)和生物量比率 (bi)。高原鼠兔、青海田鼠、小型鸟类在胃容物中 ,pi 分别为0 2 8、 0 6 8和 0 0 4 ;bi 则分别为 0 5 9、 0 4 0和 0 0 2 ;食茧中 ,pi 分别为 0 70、 0 2 7和 0 0 2 ,bi 则分别为0 89、 0 10和 0 0 1。χ2 检验表明取食个体数和生物量在胃容物和食茧之间差异显著 。
Contents of 14 stomachs and 118 food pellets were analyzed to trace dietary information of upland buzzards ( Buteo hemilasius ) living at alpine meadow ecosystem in Maduo County,Qinghai Province.The prey items can be classified into three types:① plateau pika ( Ochotona curzoniae ),② Qinghai vole ( Lasiopodomys fuscus ),and ③ small birds.The results indicated that the average occurrence frequencies ( p i ) and biomass ratios ( b i ) of plateau pika,Qinghai vole and small birds in diets of upland buzzards were 0 28,0 68 and 0 04 as well as 0 59,0 40,and 0 02 respectively. p i and b i of the prey items in food pellets were 0 70,0 27 and 0 02 as well as 0 89,0 10 and 0 01 respectively.Analyses on stomach contents and food pellets generated significant different p i and b i (χ 2 test),however,both revealed key roles of plateau pika and Qinghai vole in diets of upland buzzards.
基金
国家自然科学基金资助项目 (3 0 2 70 2 17)
