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Structure of multilocus genetic diversity in predominantly selfing populations
- Source :
- Heredity, Heredity, Nature Publishing Group, 2019, 123 (2), pp.176-191. ⟨10.1038/s41437-019-0182-6⟩, Heredity (Edinb), Heredity, 2019, 123 (2), pp.176-191. ⟨10.1038/s41437-019-0182-6⟩
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
Abstract
- AGAP : équipe GE2pop; International audience; Predominantly selfing populations are expected to have reduced effective population sizes due to nonrandom sampling of gametes, demographic stochasticity (bottlenecks or extinction–recolonization), and large scale hitchhiking (reduced effective recombination). Thus, they are expected to display low genetic diversity, which was confirmed by empirical studies. The structure of genetic diversity in predominantly selfing species is dramatically different from outcrossing ones, with populations often dominated by one or a few multilocus genotypes (MLGs) coexisting with several rare genotypes. Therefore, multilocus diversity indices are relevant to describe diversity in selfing populations. Here, we use simulations to provide analytical expectations for multilocus indices and examine whether selfing alone can be responsible for the highfrequency MLGs persistent through time in the absence of selection. We then examine how combining single and multilocus indices of diversity may be insightful to distinguish the effects of selfing, population size, and more complex demographic events (bottlenecks, migration, admixture, or extinction–recolonization). Finally, we examine how temporal changes in MLG frequencies can be insightful to understand the evolutionary trajectory of a given population. We show that combinations of selfing and small demographic sizes can result in high-frequency MLGs, as observed in natural populations. We also show how different demographic scenarios can be distinguished by the parallel analysis of single and multilocus indices of diversity, and we emphasize the importance of temporal data for the study of predominantly selfing populations. Finally, the comparison of our simulations with empirical data on populations of Medicago truncatula confirms the pertinence of our simulation framework.
- Subjects :
- Male
0106 biological sciences
0301 basic medicine
Genotype
[SDV]Life Sciences [q-bio]
Population
Outcrossing
Biology
010603 evolutionary biology
01 natural sciences
Article
03 medical and health sciences
Diversity index
Effective population size
Genetics
Animals
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology
education
Genetics (clinical)
Selection (genetic algorithm)
Population Density
Genetic diversity
education.field_of_study
Models, Genetic
Population size
Genetic Variation
food and beverages
Selfing
Biological Evolution
Genetics, Population
030104 developmental biology
Evolutionary biology
[SDE]Environmental Sciences
Female
Subjects
Details
- ISSN :
- 13652540 and 0018067X
- Volume :
- 123
- Database :
- OpenAIRE
- Journal :
- Heredity
- Accession number :
- edsair.doi.dedup.....dceff81a579e77171015f37ad2da3e5c