捕食关系的Meta分析

应用Ｍｅｔａ分析方法，探讨捕食与被捕食者种群数量的关系，结果捕食效应随地带性而变化，热带效应值最大，亚热带，温带和寒带也有效应，亚热带最小，按分类划分成两个级别时，脊椎动物级别属于大效应，而无脊椎动物级别为小效应，级别间差异不显著，按所在生态系统划分级别分析，陆生生态系统级别的中效应，淡水生态系统为小儿应，总体上表明捕食导致被捕食者种群数量的降低，但不同标准划分的级别里几个级别的效应大小有差别，通

The Meta Analysis on the relationships between predator and prey

The relationships between the predator and prey's population number were studied with Meta Analysis Method. The results showed as follows. The change of predacious effect varied with the zonal change. The effect in tropics was the biggest, in subtropical zone it was lowest and in temperate zone and frigid zone the medial. The effect in vertebrate classes was bigger than that in inverterate classes.The effect in terrestrial ecosystems was bigger than that in freshwater ecosystems. In general the predator made decrease of prey's population number, and there were various effect values in different classes.