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Science 11 June 1993:
Vol. 260. no. 5114, pp. 1643 - 1646
DOI: 10.1126/science.260.5114.1643
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Articles

Unidirectional Spread of Secondary Sexual Plumage Traits Across an Avian Hybrid Zone

Thomas J. Parsons 1, Storrs L. Olson 2, and Michael J. Braun 3

1 Laboratory of Molecular Systematics, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560
2 Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560
3 Laboratory of Molecular Systematics and Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560

Theory predicts that traits under positive selection can rapidly cross a hybrid zone in spite of a substantial barrier to neutral gene flow between hybridizing taxa. An avian hybrid zone between Manacus candei (white-collared manakin) and M. vitellinus (golden-collared manakin) is reported here that displays an unusual pattern of noncoincident clines. Male secondary sexual traits of M. vitellinus have spread into populations that are genetically and morphometrically like M. candei. These birds have a lek breeding system in which male mating success is highly skewed, suggesting that sexual selection is driving male sexual traits across the zone.

Submitted on September 9, 1992
Accepted on April 5, 1993


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