Quantitative analysis of "point" distribution areas of species is analyzed; this method interpolates species distribution to the whole territory based on its correlations with climatic and landscape variables. It is demonstrated that the application of standard statistical interpolation techniques is inappropriate. The new approach uses the interpolation of the species specific relations with environmental variables determined at individual points to the whole territory. The basic method for solving this problem is factor analysis. This study analyzed methods for quantifying species relations to particular climate and relief variables. Efficiency of this analysis is demonstrated by a case study of three brown frog species: Rana temporaria, R. arvalis, and R. amurensis.
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