Sexual selection promotes reproductive isolation in barn swallows

• 成果类型: Article
• 署名作者: Schield, Drew R.; Carter, Javan K.; Scordato, Elizabeth S. C.; Levin, Iris I.; Wilkins, Matthew R.; Mueller, Sarah A.; Gompert, Zachariah; Nosil, Patrik; Wolf, Jochen B. W.; Safran, Rebecca J.
• 署名单位: University of Colorado System; University of Colorado Boulder; University of Virginia; California State University System; California State Polytechnic University Pomona; University System of Ohio; Kenyon College; University of Munich; Utah System of Higher Education; Utah State University; Universite PSL; Ecole Pratique des Hautes Etudes (EPHE); Institut Agro; Montpellier SupAgro; CIRAD; Centre National de la Recherche Scientifique (CNRS); Institut de Recherche pour le Developpement (IRD); Universite Paul-Valery; Universite de Montpellier
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11986
• DOI: 10.1126/science.adj8766
• 发表日期: 2024-12-13
• 关键词: recent positive selection; whole-genome association; hirundo-rustica; plumage color; gene-flow; oculocutaneous albinism; species recognition; tail ornamentation; natural-selection; local adaptation

摘要

Despite the well-known effects of sexual selection on phenotypes, links between this evolutionary process and reproductive isolation, genomic divergence, and speciation have been difficult to establish. We unravel the genetic basis of sexually selected plumage traits to investigate their effects on reproductive isolation in barn swallows. The genetic architecture of sexual traits is characterized by 12 loci on two autosomes and the Z chromosome. Sexual trait loci exhibit signatures of divergent selection in geographic isolation and barriers to gene flow in secondary contact. Linkage disequilibrium between these genes has been maintained by selection in hybrid zones beyond what would be expected under admixture alone. Our findings reveal that selection on coupled sexual trait loci promotes reproductive isolation, providing key empirical evidence for the role of sexual selection in speciation.