Plant Material
Grids of plots (10 m × 10 m) were outlined for SI and RO populations that covered 0.21 ha and 0.14 ha, respectively. Each individual was identified with a number written on a piece of sheet metal and the label was attached to the tree bark with a nail, or a seal in the case of young trees. For each individual, spatial coordinates were registered using a GPS (GARMIN 60CSX).