FIGURE 1.
Map of the study sites: Witpan (S 26° 40, 658′ E 020° 09, 45′) in South Africa, Omongwa pan (S 23° 42, 59′ E 019° 22, 15′) in eastern Namibia, Kalahari Desert. Quantum GIS 2.18 was used to produce the map (http://www.qgis.org).
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