Nuclear genetic structure.

Bayesian Assignment. aRecognised number of Bayesian clusters (K) in neutral hypervariable nuclear markers (microsatellites), see methods. bGoodness of fit (φ) between Bayesian assignment (K = 2, or assumed to be 2 for comparison) based on microsatellites and categories predicted by allopatric speciation across n individuals along transect. cGoodness of fit (φ) between Bayesian assignment (K = 2, or assumed to be 2 for comparison) based on microsatellites and categories predicted by ecological speciation across n individuals along transect. 1See the text for a caveat to this prediction.