Figure 1

Genetic flow network for Cymodocea nodosa . Genetic flow network for Cymodocea nodosa meadows at the percolation threshold, obtained via the JSD measure applied to raw gamete data from the sampled meadows (the genetically very distant and disconnected Greek populations are not shown). Different colors indicate the different meadow origins. The network is displayed via a spring embedding algorithm, i.e. it does not contain geographical information. Nevertheless the genetic clusters well trace the different geographical origins, as it is possible to see by comparison with the approximately overlayed map displayed below.