Table 2. Genetic diversity in M. guttatus, M. luteus s.l. (M. luteus var. luteus × M. luteus var. variegatus=M. x smithii), and M. x robertsii in the UK.

Population	A	A′	H′	HO	Mean pairwise dissimilarity
M. guttatus (2 × )
AYR	24	2.08	1.28	0.24	0.46
BAL	18	1.50	1.19	0.18	0.35
CER	23	1.92	1.70	0.64	0.35
COL	37	3.17	1.32	0.29	0.62
DBL	36	3.08	1.32	0.30	0.61
DUR	19	1.58	1.57	0.45	0.32
HOU	20	1.67	1.25	0.24	0.38
KES	23	1.92	1.09	0.09	0.47
PIT	15	1.25	1.01	0.01	0.07
QUA	27	2.33	1.72	0.63	0.30
TOM	26	2.25	1.40	0.39	0.43
WOL	17	1.42	1.42	0.42	—
Population mean	23.75±2.10	2.01±0.18	1.36±0.07	0.32*±0.05	0.39*±0.05
Within taxon total	56
M. x robertsii (3 × )
BAL	24	2.17	1.90	0.62	0.24
GOO	25	2.25	2.06	0.65	0.16
KES	26	2.33	2.23	0.77	0.22
MER	27	2.42	2.09	0.74	0.20
NEN	28	2.42	2.01	0.77	0.37
NOR	26	2.33	2.14	0.74	0.19
PLY	25	2.33	2.07	0.77	0.19
WOL	26	2.33	2.06	0.72	0.25
Population mean	25.87±0.47	2.32±0.03	2.08±0.03	0.72*±0.02	0.23*±0.02
Within taxon total	44
M. luteus s.l. (4 × )
COL	23	1.92	1.92	0.75	0.13
Overall population Mean	26.00±1.37	2.17±0.11	1.62±0.08	0.52±0.05	0.31±0.03
Across taxa total	77

Abbreviations: A, number of unique (different) alleles across all loci; A′, number of alleles per locus in the population (mean across loci); H′, number of alleles per locus in an individual (mean over loci); HO, proportion of observed heterozygotes (mean across loci).

* Denotes statistically differences among taxa as assessed with a t-test; P<0.01.

Mean pairwise genetic dissimilarity calculated from a binary matrix.