Table 1 Comparison of population-level allelic richness and individual-level genetic diversity (IR and PHt) for historical (1903–1912), (1929–1955) and contemporary (2008–2009) samples

Early

1903-1912

5.96

1.12

0.11

0.61

Middle

1929-1932

6.00

0.87

−0.08

0.77

1934-1938

6.17

0.94

−0.02

0.71

1940-1945

6.08

0.90

−0.06

0.75

1951-1955

4.71

0.48

0.04

0.68

Contemporary

2008-2009

5.54

0.84

0.0

0.73