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Parallel introgression and selection on introduced alleles in a native species
Rachael A Bay1, Eric B Taylor2, Dolph Schluter2
1Department of Evolution and Ecology, University of California, Davis, Davis, California.
Molecular Ecology
|April 14, 2019
Summary
Introduced rainbow trout alleles repeatedly show high frequency in native westslope cutthroat trout populations, indicating parallel adaptation. Some introgressed genes provide significant fitness advantages, informing conservation of hybridizing species.
Area of Science:
- Ecology
- Evolutionary Biology
- Genetics
Background:
- Human-mediated species introductions are increasing interspecific hybridization.
- Hybridization impacts native species fitness through novel genetic combinations.
- Studying replicated introductions reveals selection on introgressed alleles.
Purpose of the Study:
- Examine selection on introgressed alleles from invasive rainbow trout (Oncorhynchus mykiss) into native westslope cutthroat trout (Oncorhynchus clarkii lewisi).
- Investigate parallel adaptive advantages of introgressed alleles across independent populations.
- Assess the role of selection in introgression dynamics.
Main Methods:
- Analyzed introgression patterns of single nucleotide polymorphisms (SNPs) across Canadian watersheds.
- Utilized population genetics to identify introgressed alleles.
- Employed simulations to estimate selection coefficients.
Main Results:
- Introgression levels of individual SNPs correlated across independent watersheds.
- Several rainbow trout alleles repeatedly swept to high frequency in native populations.
- Simulations indicated strong selection coefficients (up to 0.05) favoring certain introgressed alleles.
Conclusions:
- Despite previous findings of reduced hybrid fitness, specific introgressed genomic regions are strongly favored by selection.
- Replicated introductions serve as valuable models for studying parallel adaptation and selection-introgression interactions.
- Understanding beneficial introgressed alleles is crucial for managing hybridizing species.
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