Table 1.

Group assignment from CVA-Mahalanobis distances of P. antipodarum parental and F₁ lineages

Site	Bear River	Bear River F1	Green River	Green River F1	Polecat Creek	Polecat Creek F1
Bear River	21	0	1	2	0	0
Bear River F1	0	52	0	0	1	13
Green River	1	0	18	0	1	0
Green River F1	7	1	2	39	2	2
Polecat Creek	0	0	0	0	14	0
Polecat Creek F1	0	2	0	3	1	22

Original groups based on sites are placed along rows, while CVA groups based on morphological variability are placed along columns. The parental Bear River site consisted of 24 individuals, the parental Green River site consisted of 20 individuals, and the parental Polecat Creek site consisted of 14 individuals. The group assignment test placed 88% of Bear River parental snails, 90% of Green River parental snails, and 100% of Polecat Creek parental snails to the correct site and lineage. The Bear River F₁ lineage consisted of 66 individuals, Green River F₁ lineage consisted of 53 individuals, and Polecat Creek F₁ lineage consisted of 28 individuals. The group assignment test placed 79% of F₁ Bear River snails, 74% of F₁ Green River snails, and 78% F₁ Polecat Creek snails to the correct site. Only 19% of snails from both lineages were assigned to an incorrect site. The largest number of incorrectly assigned snails was 13 F₁ Bear River snails being erroneously categorized as F₁ Polecat Creek Snails.