Figure
4. Occurrence and distribution of the 31 genetic clusters in the seven
water systems and three individual lakes (Saxvattnet, Rörvattnet,
Ånnsjön). Pie diagrams show the representation of populations in the
present (leftmost diagram in each pair) and the past samples (rightmost
diagram; detailed illustration of the genetic clusters in each system
are provided in Figure S1). Estimates of effective population size
measured as N eV are indicated for each population
occurring at both points in time. Black arrows indicate direction of
water flow. Note the presence of “new” populations in the present
samples from Skåarnja 1 (Lake Daimanjaure) and Hotagen 1 (Lake
Munsvattnet).