Figure 5. Geographic clines fitted for the hybrid index and divergent phenotypic traits. Dashed-vertical lines showing the cline centers, while the shaded area are the 95% confidence intervals for each cline. A) Hybrid index and plumage brightness clines fitted for the S. c. corvina and S. c. hicksii contact zone. B) Hybrid index and morphometric traits clines fitted for the S. c. corvina andS. c. hicksii contact zone. C) Hybrid index and plumage brightness clines fitted for the S. c. hoffmanni and S. c. hicksii contact zone. D) Hybrid index and morphometric traits clines fitted for the S. c. hoffmanni and S. c. hicksii contact zone.
Table 1. Analyses of variance among subspecies for each of the morphometric traits (Body mass, Beak size, Tarsus length, Wing length, Tail length).