期刊
ECOLOGY AND EVOLUTION
卷 2, 期 10, 页码 2413-2429出版社
WILEY
DOI: 10.1002/ece3.365
关键词
Allele sharing; coalescent; Icterus; IMa2; incomplete lineage sorting; introgression; multipopulation; northern orioles
资金
- National Science Foundation [DEB-0347083, DEB-1119506]
- Maryland Ornithological Society
- American Ornithologist's Union Research Grant
- Division Of Environmental Biology
- Direct For Biological Sciences [1119506] Funding Source: National Science Foundation
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 likely mtDNA introgression between I. galbula and I. abeillei. Here, we examine the divergence population genetics of the entire northern oriole group using a multipopulation Isolation-with-Migration (IM) model. In accordance with Haldane's rule, nuclear loci introgress extensively beyond the I. galbula-I. bullockii hybrid zone, while mtDNA does not. We found no evidence of introgression between I. bullockii and I. abeillei or between I. galbula and I. abeillei when all three species were analyzed together in a three-population model. However, traditional pairwise analysis suggested some nuclear introgression from I. abeillei into I. galbula, probably reflecting genetic contributions from I. bullockii unaccounted for in a two-population model. Thus, only by including all members of this group in the analysis was it possible to rigorously estimate the level of gene flow among these three closely related species.
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