Phylogeography of Pogonomyrmex barbatus and P. rugosus harvester ants with genetic and environmental caste determination.

In contrast, the Prug 2 clade (which appears to occupy the Sonoran Desert, south of the Gila River) produced Fu’s Fs and R 2 estimates that were not quite significant, suggesting that it may not have experienced a major expansion in recent Pleistocene/Holocene time (Table 6 ).

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