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Asynchronous life cycles contribute to reproductive isolation between two Alpine butterflies
Selim Bouaouina1, Yannick Chittaro2, Yvonne Willi1
1Department for Environmental Sciences, University of Basel, Basel, Switzerland.
Evolution Letters
|December 4, 2023
Summary
Temporal isolation, or allochrony, helps maintain contact zones between butterfly species with asynchronous life cycles. This reproductive isolation mechanism is crucial for coexistence in areas of secondary contact.
Area of Science:
- Evolutionary Biology
- Ecology
- Genetics
Background:
- Geographic isolation drives genetic divergence and reproductive isolation.
- Secondary contact zones are crucial for studying the evolution of reproductive isolation and coexistence.
- Allochrony (temporal isolation) is a proposed mechanism for reproductive isolation, but its role in secondary contact zones is less understood.
Purpose of the Study:
- To investigate the role of allochrony in maintaining secondary contact zones between two Alpine butterfly species.
- To assess the geographic stability and genetic exchange within these contact zones over time.
Main Methods:
- Long-term field sampling over several years.
- Analysis of museum specimens.
- Genomic inferences to assess gene flow and genetic structure.
Main Results:
- Contact zones have remained geographically stable for decades.
- Asynchronous life cycles (allochrony) appear to maintain these zones.
- Leaky allochrony allows some gene flow, which is influenced by geographic isolation.
Conclusions:
- Allochrony can contribute to the maintenance of secondary contact zones for lineages that diverged in allopatry.
- Asynchronous life cycles play a significant role in preventing complete reproductive isolation and promoting coexistence.
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