Overview of results.

The number of instances (statistical tests per species or per population) in which the relevant prediction could be rejected are indicated followed after a slash by the total number of instances (e.g. 1/2 means that one out of the two tests rejected the prediction); predictions which are not applicable are indicated by ��N/A�� (*the gene tree for A. sexdens could not resolve which populations were basal or derived; **the predictions for the Pleistocene refugia and marine incursion models are identical for A. laevigata).