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Probabilities of assignment of G. fortis individuals in (a) early (1976–98; n = 1382) and (b) late (1998–2008; n = 344) samples. Probabilities of less than 0.900 indicate hybrids and backcrosses with mixtures of G. fortis and G. fuliginosa genes. Probabilities of greater than 0.99 are indicated in grey. Geospiza fortis × G. scandens hybrids and backcrosses are not included.
