期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 23, 期 6, 页码 1312-1320出版社
WILEY
DOI: 10.1111/j.1420-9101.2010.02001.x
关键词
Haldane's rule; Heliconius; parapatric; post-mating isolation; pre-mating isolation; speciation
资金
- Facultad de Ciencias, Universidad de los Andes
- Banco de la Republica
- COLCIENCIAS [120 440 520 138]
- Royal Society University
- Leverhulme Trust
An important evolutionary question concerns whether one or many barriers are involved in the early stages of speciation. We examine pre- and post-zygotic reproductive barriers between two species of butterflies (Heliconius erato chestertonii and H. e. venus) separated by a bimodal hybrid zone in the Cauca Valley, Colombia. We show that there is both strong pre- and post-mating reproductive isolation, together leading to a 98% reduction in gene flow between the species. Pre-mating isolation plays a primary role, contributing strongly to this isolation (87%), similar to previous examples in Heliconius. Post-mating isolation was also strong, with absence of Haldane's rule, but an asymmetric reduction in fertility (< 11%) in inter-specific crosses depending on maternal genotype. In summary, this is one of the first examples of post-zygotic reproductive isolation playing a significant role in early stages of parapatric speciation in Heliconius and demonstrates the importance of multiple barriers to gene flow in the speciation process.
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