Dalhousie Springs hydrobiids n 
Table 6. Measures of genetic variation within samples of Fluvidona centralia. The columns give the mean sample size 
and mean number of alleles per locus, the percentage of loci where more than one allozyme was detected, the 
mean observed heterozygosity and Nei’s (1978) unbiased estimate of expected heterozygosity. Standard 
deviations are given in brackets. 
Mean sample Mean No. Percentage Mean heterozygosity 
P , size per of alleles of loci Direct- HdyWbg 
opulation Locus per locus polymorphic count expected 
l. D70 (Cd11) 3.7 10 4.0 020 017 
(2) (0) ( .020) ( .017) 
2. D62 (E1 outflow) 11.7 1.0 0 000 000 
(n2) (4) - ( .000) ( .000) 
3. D23A&B (ЕЗ) 12.9 10 0 000 000 
(225) ( .0) ( .000) ( .000) 
^. D53 (F9) 9.3 1.0 4.0 003 003 
5 ( .4) ( .0) ( .003) ( .003) 
“БІЗ Gal) 12.0 11 12.0 027 048 
6. D5 (0 (62!) ( .016) ( .027) 
: 25 outflow (Ga2) 12.0 1.2 16.0 .053 .062 
(0 ( .1) ( .026) ( .030) 
7.015 (баб) 4.0 10 40 020 023 
