Fig. 4

Similarity values calculated for the groups of invaded sites (Dg+, black bars), non-invaded sites (Dg-, white bars) and the comparison between them (Dg+/Dg-, grey bars) in the basins (numbers). Note that the invaded basins have greater similarities than the non-invaded basins. Biobio River Basin (83), Tolten River Basin (94), Valdivia River Basin (101), Bueno River Basin (103), Puelo River Basin (105), Yelcho River Basin (107), Palena and coastal Rivers in the Southern Limit of the Tenth Region River Basin (110), Coastal and Island Rivers Between Palena River and Aysen River Basins (111), Aysen River Basin (113), Baker River Basin (115), Coastal Rivers Between Seno Andrew and Hollemberg River and Rivers to the East River Basins (122), and Tierra del Fuego (128)