What shapes the continuum of reproductive isolation? Lessons from Heliconius butterflies
The process by which species evolve can be illuminated by investigating barriers that limit gene flow between taxa. Recent radiations, such as Heliconius butterflies, offer the opportunity to compare isolation between pairs of taxa at different stages of ecological, geographical, and phylogenetic di...
| Autores: | , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2017 |
| País: | Colombia |
| Recursos: | Universidad del Rosario |
| Repositorio: | Repositorio EdocUR - U. Rosario |
| Idioma: | inglés |
| OAI Identifier: | oai:repository.urosario.edu.co:10336/22880 |
| Acesso em linha: | https://doi.org/10.1098/rspb.2017.0335 https://repository.urosario.edu.co/handle/10336/22880 |
| Access Level: | acceso abierto |
| Palavra-chave: | Adaptive radiation Butterfly Cladistics Comparative study Divergence Gene flow Hybrid Mate choice Mimicry Natural selection Reproductive isolation Sterility Heliconius Lepidoptera Papilionoidea Animal Phylogeny Physiology Pigmentation Species differentiation Wing Animals Butterflies Genetic speciation Hybrid sterility Magic trait Reproductive barriers Speciation animal Wings |
| Resumo: | The process by which species evolve can be illuminated by investigating barriers that limit gene flow between taxa. Recent radiations, such as Heliconius butterflies, offer the opportunity to compare isolation between pairs of taxa at different stages of ecological, geographical, and phylogenetic divergence. Here, we report a comparative analysis of existing and novel data in order to quantify the strength and direction of isolating barriers within a well-studied clade of Heliconius. Our results highlight that increased divergence is associated with the accumulation of stronger and more numerous barriers to gene flow. Wing pattern is both under natural selection for Mu¨ llerian mimicry and involved in mate choice, and therefore underlies several isolating barriers. However, pairs which share a similar wing pattern also display strong reproductive isolation mediated by traits other than wing pattern. This suggests that, while wing pattern is a key factor for early stages of divergence, it may become facultative at later stages of divergence. Additional factors including habitat partitioning, hybrid sterility, and chemically mediated mate choice are associated with complete speciation. Therefore, although most previous work has emphasized the role of wing pattern, our comparative results highlight that speciation is a multi-dimensional process, whose completion is stabilized by many factors. © 2017 The Author(s) Published by the Royal Society. All rights reserved. |
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