62 



Nelson G. Hairston, St., and R. Haven Wiley 



8a 



60 



'40 



Plethodon Hybrids 



Fig. 2. History of the Plethodon population at Coweeta. Symbols are the 

 same as in Figure 1. 



D. quadramoculatus 



DU 









^V» D. monticola 





40 



j 



/ 



JfT\ . 







30 



J^r-^^^ J 



( 



A \K 







220 

 5 10 

 O 





u 



V\ \JN 







1972 ' ' '75 ' 



■ 



' 80 ' 



• as ' 



' '90 ' 



<*40 



A ochrophaeus 



Fig. 3. Population histories of four species of Desmognathus at 686-m 

 elevation, Coweeta Hydrological Laboratory. Symbols are the same as in 

 Figure 1. 



