Conclus ions 



(1) The number of species in a fauna is primarily determined by the mean temperature of the 

 warmest month of the year (July). 



(2) The greatest number of species of mammals, birds and reptiles in the territory of the USSR 

 are found in areas with a July temperature on the order of 20-26°C. 



(3) The quantity of species of amphibians is determined chiefly by microclimatic factors. 



(4) An expression for the approximation of the "rule of the optimum" for species diversity is 

 the following equation: y = x 



a + bx + ex 2 + . . . . 



( 



' 



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