Journal
EVOLUTION
Volume 72, Issue 4, Pages 722-734Publisher
WILEY
DOI: 10.1111/evo.13431
Keywords
Adaptation; coalescent theory; genetic variation; models; simulations; population genetics; population structure
Categories
Funding
- Simons Foundation
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R25GM099644] Funding Source: NIH RePORTER
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Selective sweeps reduce neutral genetic diversity. In sexual populations, this hitchhiking effect is thought to be limited to the local genomic region of the sweeping allele. While this is true in panmictic populations, we find that in spatially extended populations the combined effects of many unlinked sweeps can affect patterns of ancestry (and therefore neutral genetic diversity) across the whole genome. Even low rates of sweeps can be enough to skew the spatial locations of ancestors such that neutral mutations that occur in an individual living outside a small region in the center of the range have virtually no chance of fixing in the population. The fact that nearly all ancestry rapidly traces back to a small spatial region also means that relatedness between individuals falls off very slowly as a function of the spatial distance between them.
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