ADAPTATIONS TO DESERTS 



12.0 . 



10.0 



8.0 



6.0 



40 



2.0 



_ 12.0 



22°C ^-_35C. 



22 C 



N = 9 



N = 3 



N = 5 



N = 4 



10.0 



8.0 



6.0 



4.0 



2.0 



DIST. 



DIST. 

 H20 



5DAYS 

 WATER 

 OEPRIV. 



Figure 10. Ratio of urine and serum osmolar concentrations for Citellus 

 leucurus subjected to the various conditions of water availability described below 

 each rectangle. Arrows denote the ambient temperature to which animals were 

 exposed. N indicates the number of animals. 



439 



