Figure 2
From: Population divergence and gene flow in two East Asian shorebirds on the verge of speciation
Two hypotheses for the interaction between Kentish and White-faced Plovers: (A) shallow divergence with widespread gene flow - a genomic cline from northern to southern China, with the greatest differentiation seen at either end of the spectrum of distribution and a broad hybrid zone, and (B) deeper divergence with limited gene flow – the two taxa meet at a narrow contact zone and show limited hybridization.
