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Ecological divergence plays an important role in strong but complex reproductive isolation in campions (Silene)*

Karrenberg, Sophie; Liu, Xiaodong; Hallander, Emelie; Favre, Adrien; Herforth-Rahmé, Joelle and Widmer, Alex (2018) Ecological divergence plays an important role in strong but complex reproductive isolation in campions (Silene)*. Evolution, 73 (2), pp. 245-261.

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Online at: https://onlinelibrary.wiley.com/doi/10.1111/evo.13652


New species arise through the evolution of reproductive barriers between formerly interbreeding lineages. Yet, comprehensive assessments of potential reproductive barriers, which are needed to make inferences on processes driving speciation, are only available for a limited number of systems. In this study, we estimated individual and cumulative strengths of seven prezygotic and six postzygotic reproductive barriers between the recently diverged taxa Silene dioica (L.) Clairv. and S. latifolia Poiret using both published and new data. A combination of multiple partial reproductive barriers resulted in near‐complete reproductive isolation between S. dioica and S. latifolia, consistent with earlier estimates of gene flow between the taxa. Extrinsic barriers associated with adaptive ecological divergence were most important, while intrinsic postzygotic barriers had moderate individual strength but contributed only little to total reproductive isolation. These findings are in line with ecological divergence as driver of speciation. We further found extensive variation in extrinsic reproductive isolation, ranging from sites with very strong selection against migrants and hybrids to intermediate sites where substantial hybridization is possible. This situation may allow for, or even promote, heterogeneous genetic divergence.

EPrint Type:Journal paper
Keywords:Adaptation, gene flow, germination, reproductive barrier, speciation
Subjects: Crop husbandry
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:34714
Deposited On:04 Mar 2019 09:26
Last Modified:13 Jan 2021 07:28
Document Language:English
Refereed:Peer-reviewed and accepted

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