Fig 3. The neighbour-joining tree (NJT) for the French data set F partitioned into 17 watersheds (A-Q) following Douhovnikoff and Dodd [31] based on Nei’s genetic distance ([47] after [48]) calculated using 12 nuclear SSR markers.

Watersheds from A to Q are distributed from north to south in central California (see also Fig 1 and S1 Table). Bootstrap values are presented as percentage.