Phylogeographic structure of the fire ant Solenopsis invicta in its native South American range: roles of natural barriers and habitat connectivity.
Ahrens ME, Ross KG, Shoemaker DD. Phylogeographic structure of the fire ant Solenopsis invicta in its native South American range: roles of natural barriers and habitat connectivity. Evolution. 2005 Aug; 59(8):1733-43.