Fig. 4From: Speciation and hybridization in invasive fire antsModel of S. invicta demographic history. The model describes the population history starting with the divergence within the native populations and followed by the introduction to North America, which originated from the Herradura population. Populations: NN1 – native population of Herradura; NN2 – native population of Alejandra and El Recreo; NF – bottlenecked founder population in the USA; NI – contemporary population in the USA. Times: 0 – populations sampling; TI – introduction; TB – length of bottleneck for the introduced population; TD - divergence of the Herradura population from the Alejandra and El Recreo populationsBack to article page