QUANTITATIVE MEASUREMENT OF FOOD SELECTION - MODIFICATION OF FORAGE RATIO AND IVLEVS ELECTIVITY INDEX
QUANTITATIVE MEASUREMENT OF FOOD SELECTION - MODIFICATION OF FORAGE RATIO AND IVLEVS ELECTIVITY INDEX
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DOI：
10.1007/bf00384581
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发表时间：
1974-01-01
期刊：
影响因子：
2.7
通讯作者：
JACOBS, J
中科院分区：
文献类型：
--
作者：
JACOBS, J
饲料比率和 Ivlev 选择性指数是量化食物选择的常用指标，但这两个指数的值不仅取决于选择的程度，还取决于环境中食物类型的相对丰度。因此，当比较具有不同相对丰度的食物类型时，或者当研究选择与相对丰度之间的关系时，它们是无用的。提出了这两个指数的修改版本，它们直接基于由于喂养而导致的食物减少率（死亡率），并且与相对丰度无关。
The forage ratio and Ivlev's electivity index are common measures to quantify food selection but the values of both indices depend not only on the extent of selection but also on the relative abundances of the food types in the environment. They are therefore useless when food types with different relative abundances are compared, or when the relation between selection and relative abundance is studied. Modified versions of both indices are proposed which are based directly on the rates of decrement (mortality) of the food due to feeding, and are independent of the relative abundance.