期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 49, 页码 19854-19859出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1316851110
关键词
reproductive isolation; population structure; Anopheles coluzzii
资金
- National Institutes of Health [R01AI 078183, R21AI062929, D43TW007390, T32AI074550]
The M and S forms of Anopheles gambiae have been the focus of intense study by malaria researchers and evolutionary biologists interested in ecological speciation. Divergence occurs at three discrete islands in genomes that are otherwise nearly identical. An islands of speciationmodel proposes that diverged regions contain genes that are maintained by selection in the face of gene flow. An alternative incidental islandmodel maintains that gene flow between M and S is effectively zero and that divergence islands are unrelated to speciation. A divergence island SNPassay was used to explore the spatial and temporal distributions of hybrid genotypes. Results revealed that hybrid individuals occur at frequencies ranging between 5% and 97% in every population examined. A temporal analysis revealed that assortative mating is unstable and periodically breaks down, resulting in extensive hybridization. Results suggest that hybrids suffer a fitness disadvantage, but at least some hybrid genotypes are viable. Stable introgression of the 2L speciation island occurred at one site following a hybridization event.
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