Fitted geographic clines for genetic markers and phenotypic traits across the jacana hybrid zone. Points represent frequency of marker and traits at sampled populations. In b-f), grey line shows mtDNA fitted cline for comparison. a) COI mtDNA marker; b) gadph autosomal intron; c) 10551 autosomal intron; d) dorsal plumage; e) ventral plumage; f) facial ornament. The cline centers for COI, 10551, and all three phenotypic traits were coincident, whereas the center for gapdh was significantly displaced to the east.