Wendland Victor
, Ringbahnstr 79, D-1000, Berlin 42.
Oecologia. 1981 Feb;48(1):7-12. doi: 10.1007/BF00346981.
In two forest areas of West Berlin the population-changes in three mouse species have been investigated over 28 years (1952-1979). Significant changes in absolute density have been established for the Short-Tailed Vole (Microtus agrestis) at 5-year intervals, for the Common Vole (Microtus arvalis) at 4-year intervals, and for the Yellow-Necked Field Mouse (Apodemus flavicollis) at 3-year intervals. The investigations were based on a total of 43,535 small vertebrates, 90% of which had been found in the pellets of breeding Tawny Owls. The remaining 10% belonged to pellets collected in the territories of breeding Long-Eared Owls. It is assumed that, for those prey animals whose percentage in the total prey of a predator is fairly high, the percentage proportionally approximates the real fluctuations in their (absolute) density.
在西柏林的两个林区，对三种鼠类的种群变化进行了为期28年（1952年至1979年）的调查。已确定短尾田鼠（Microtus agrestis）的绝对密度每5年有显著变化，普通田鼠（Microtus arvalis）每4年有显著变化，黄颈姬鼠（Apodemus flavicollis）每3年有显著变化。这些调查基于总共43535只小型脊椎动物，其中90%是在繁殖的茶色雕的粪便中发现的。其余10%属于在长耳鸮繁殖领地收集的粪便。据推测，对于那些在捕食者总猎物中所占比例相当高的猎物动物来说，该比例与它们（绝对）密度的实际波动成比例近似。
