58 



Donald A. Merkle 



Table 1 



Allelic frequencies at polymorphic loci in_Virginia populations of 

 Agkistrodon piscivorus. N = sample size; H = mean heterozygosity 

 per individual. 





N 



Got-2 



Xdh-1 

 a b 



Lap-1 

 a b 





Locality 



a 



b 



H 



1. Newport News 



10 



.300 



.700 



.850 



.150 



.100 



.900 



.019 



2. Hopewell 



9 



.111 



.899 



.944 



.056 



.111 



.889 



.017 



3. Sea Shore 



2 



.250 



.750 



.000 



1.000 



.000 



1.000 



.009 



4. Gum Swamp 



7 



.214 



.786 



.857 



.143 



.000 



1.000 



.013 



5. Northwest R. 



11 



.364 



.636 



.091 



.909 



.000 



1.000 



.012 



6. False Cape 



10 



.400 



.600 



.350 



.650 



.000 



1.000 



.029 



Variability at Polymorphic Loci 



Got-2: 



Xdh-1 



Lap-1 



This locus was polymorphic in all populations, with the fre- 

 quency of Got-2 a ranging from .111 in the Hopewell popula- 

 tion to .400 in the False Cape State Park population. 

 Two alleles were present in all populations, with the excep- 

 tion of Sea Shore State Park where only Xdh-l b was present. 

 Xdh-l b was the predominant allele in the False Cape State 

 Park and Northwest River populations, while Xdh-l a pre- 

 dominated in the populations from Hopewell, Newport News, 

 and Gum Swamp. 



Most individuals were monomorphic for Lap-l b , but one 

 individual from both Newport News and Hopewell popula- 

 tions possessed Lap-l a in the heterozygous condition. 



Observed mean individual heterozygosity values (H) ranged from a 

 low of 0.9% in the Sea Shore State Park population to a high of 2.9% in 

 the population at False Cape State Park. The mean heterozygosity per 

 locus per individual for all populations was 1.6%. Nei's (1972) index of 

 genetic identity values for all pairings is presented in Table 2. 



Table 2. Nei's index of genetic identity values between populations of Agkis- 

 trodon piscivorus from Virginia. 





Newport 



Sea 



Gum 



Northwest 



False 





News 



Shore 

 .97109 



Swamp 

 .99932 



River 



Cape 



1. Hopewell 



.99826 



.97664 



.98925 



2. Newport News 





.96390 



.99880 



.96840 



.98229 



3. Sea Shore 







.97118 



.99918 



.99434 



4. Gum Swamp 









.97601 



.98847 



5. Northwest R. 











.99731 



