A Mathematical Method of Analyzing Biogeographical Data. I. Herpetofauna of Illinois

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Abstract
A divergence factor (D) is defined which indicates the rate of species replacement in a given area. All geographical points having equal values of D may be connected by a contour line (isometabasis). The resulting contour map indicates regions of little change (equivalent to biotic provinces) and regions of rapid change (equivalent to province boundaries). This procedure reduces the possibility of subjective bias in analyzing zoogeographic data. The herptofaunal data fromthe state of Illinois are used to illustrate the potential advantages of the method.

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