| extensive introgressive hybridization within the northern oriole group (genus icterus) revealed by three-species isolation with migration analysis. | until recently, studies of divergence and gene flow among closely-related taxa were generally limited to pairs of sister taxa. however, organisms frequently exchange genes with other non-sister taxa. the "northern oriole" group within genus icterus exemplifies this problem. this group involves the extensively studied hybrid zone between baltimore oriole (icterus galbula) and bullock's oriole (i. bullockii), an alleged hybrid zone between i. bullockii and black-backed oriole (i. abeillei), and li ... | 2012 | 23145328 |