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Emergence of long-term balanced polymorphism under cyclic selection of spatially variable magnitude

Title
Emergence of long-term balanced polymorphism under cyclic selection of spatially variable magnitude
Authors
Gulisija, DavorkaKim, Yuseob
Ewha Authors
김유섭
SCOPUS Author ID
김유섭scopus
Issue Date
2015
Journal Title
EVOLUTION
ISSN
0014-3820JCR Link1558-5646JCR Link
Citation
vol. 69, no. 4, pp. 979 - 992
Keywords
Balancing selectiongenetic polymorphismpopulation subdivisiontemporally varying selection
Publisher
WILEY-BLACKWELL
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A fundamental question in evolutionary biology is what promotes genetic variation at nonneutral loci, a major precursor to adaptation in changing environments. In particular, balanced polymorphism under realistic evolutionary models of temporally varying environments in finite natural populations remains to be demonstrated. Here, we propose a novel mechanism of balancing selection under temporally varying fitnesses. Using forward-in-time computer simulations and mathematical analysis, we show that cyclic selection that spatially varies in magnitude, such as along an environmental gradient, can lead to elevated levels of nonneutral genetic polymorphism in finite populations. Balanced polymorphism is more likely with an increase in gene flow, magnitude and period of fitness oscillations, and spatial heterogeneity. This polymorphism-promoting effect is robust to small systematic fitness differences between competing alleles or to random environmental perturbation. Furthermore, we demonstrate analytically that protected polymorphism arises as spatially heterogeneous cyclic fitness oscillations generate a type of storage effect that leads to negative frequency dependent selection. Our findings imply that spatially variable cyclic environments can promote elevated levels of nonneutral genetic variation in natural populations.
DOI
10.1111/evo.12630
Appears in Collections:
자연과학대학 > 생명과학전공 > Journal papers
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