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The purging of deleterious mutations in simple and complex mating environments
Julie Colpitts1, Darla Williscroft1, Harmandeep Singh Sekhon1
1Department of Biology, University of Ottawa, 30 Marie Curie Priv., Ottawa, Ontario, Canada K1N 6N5.
Biology Letters
|October 13, 2017
Summary
The physical complexity of mating environments significantly impacts the purging of deleterious mutations in fruit flies. Complex arenas accelerate mutation removal under polygamy, supporting sexual selection
Area of Science:
- Evolutionary biology
- Genetics
- Animal behavior
Background:
- Sexual selection is expected to help remove harmful mutations, but experimental results are mixed.
- Simplified mating environments may reduce sexual selection benefits and increase sexual conflict costs.
- The physical structure of mating arenas could influence the effectiveness of natural and sexual selection.
Purpose of the Study:
- To investigate how the physical mating environment affects the purging of deleterious mutations.
- To compare mutation purging rates under polygamy in simple versus complex mating arenas.
- To test the hypothesis that complex environments enhance the benefits of sexual selection.
Main Methods:
- Experimental evolution using *Drosophila melanogaster* (fruit flies).
- Tracking the frequency of four distinct deleterious mutations.
- Populations experienced polygamy in either simple or structurally complex mating arenas, with controlled arena size.
Main Results:
- Two of the four deleterious mutations were purged significantly faster in the complex mating environment.
- No significant difference in purging rates was observed for the other two mutations between environments.
- Results align with previous findings suggesting greater benefits of polygamy in complex settings.
Conclusions:
- The physical structure of the mating environment plays a crucial role in the efficiency of purging deleterious mutations.
- Complex mating arenas can enhance the effectiveness of sexual selection in removing genetic load.
- Environmental context is a key factor modulating the interplay between sexual selection, natural selection, and genetic drift.
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