Fig. 1

Areas of endemism Patagonia as six biotic units of fish diversity in Chile (modified from Arratia 1997 and Dyer 2000a). U1 Titicaca, U2 Atacama, U3 Central, U4 South-Central, U5 South, U6 Patagonia. Ichthyogeographic provinces are shown on the right with different shades