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Updated: May 27, 2026
07:54
Manipulation of Ploidy in Caenorhabditis elegans
Published on: March 15, 2018
A unified model of autopolyploid establishment and evolution
Benjamin P Oswald1, Scott L Nuismer
1Bioinformatics and Computational Biology, University of Idaho, Moscow, Idaho 83844, USA. bposwald@gmail.com
The American Naturalist
|November 18, 2011
Summary
Novel polyploid lineages can establish and persist without inherent fitness advantages. Simulation shows that evolving assortative mating and competition allows polyploids to thrive, even during rapid environmental change.
Area of Science:
- Evolutionary Biology
- Genetics
- Plant Sciences
Background:
- Polyploidy is common in flowering plants, yet novel polyploid lineages face extinction due to minority cytotype exclusion.
- The establishment of polyploids is challenging without strong assortative mating, reproductive assurance, or significant fitness advantages.
- Previous research sought adaptive benefits of polyploidy (e.g., competitiveness, stress tolerance) but found no consistent advantages.
Purpose of the Study:
- To investigate the potential for autopolyploid establishment and persistence without intrinsic fitness advantages.
- To model the conditions under which novel autopolyploid lineages can overcome extinction risks.
- To explore the role of evolving interactions in polyploid success.
Main Methods:
- Developed a simulation model of a diploid population with sporadic autopolyploid origin.
- Incorporated minimal initial assortative mating and niche differentiation in autopolyploids, driven by genome duplication dosage effects.
- Included realistic levels of reproductive assurance for both diploid and polyploid populations.
Main Results:
- Autopolyploid lineage establishment became common when assortative mating and competitive interactions were allowed to evolve.
- Rapid environmental change scenarios promoted the replacement of diploid lineages by their autopolyploid descendants.
- The model explains the origin of many contemporary polyploid lineages during mass extinction events without requiring pre-existing adaptive advantages.
Conclusions:
- Evolving ecological interactions, rather than intrinsic fitness benefits, can facilitate polyploid establishment and persistence.
- Environmental instability can create opportunities for polyploid radiation.
- This simulation provides a mechanism for polyploid origins, aligning with empirical observations of their prevalence and historical emergence.
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