Additional file 4.
A detailed hydrological map of the El Abra region. El Abra region map with the indication of surface and subsurface water divide. Points at, or near, base level (orange line) are indicated by solid circles; fish-inhabited pools by solid circles closer to the high water profile (blue dotted line) (adapted from Mitchell et al. 1977).
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Bradic et al. BMC Evolutionary Biology 2012 12:9 doi:10.1186/1471-2148-12-9