Figure 3-4. The combination of several characteristics such 

 as kinds of species, density, herbage cover, and height, 

 make favorable habitats for wildlife; 10-day-old fawn of 

 white-tail deer, near Hunt, Texas. May, 1959. (U.S.D.A. 

 Soil Conservation Service.) 



While there are important relations between frequency and 

 population density, it appears that data on one can be transferred 

 to the other only with the probability of considerable error, and, 

 as in the relation of height to weight, it does not appear valid to 

 transfer or interpret one in terms of the other. It is essential to 

 measure each characteristic separately for truly quantitative 

 data, although this requires more time for the field work 

 (Figure 3-4). 



The frequency index has proven very valuable in comparing 

 different vegetation types, in determining the effects of various 

 treatments or management practices and the role of microtopog- 

 raphy in causing variations in the plant cover, and in evaluating 

 the significance of species in various communities or at different 



lis • Tke Comnmunity 



