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Effective sizes and time to migration-drift equilibrium in geographically subdivided populations
O Hössjer1, Linda Laikre2, Nils Ryman2
1Department of Mathematics, Div. of Mathematical Statistics, Stockholm University, SE 106 91 Stockholm, Sweden.
Theoretical Population Biology
|September 17, 2016
Summary
Effective population size (Ne) is crucial for understanding genetic changes. This study introduces new measures for subdivided populations, finding local variance effective size (NeV) is often smaller than inbreeding effective size (NeI).
Area of Science:
- Population genetics
- Conservation biology
- Evolutionary biology
Background:
- Effective population size (Ne) quantifies genetic drift and inbreeding.
- Traditional Ne models focus on isolated populations.
- Subdivided populations require advanced Ne frameworks.
Purpose of the Study:
- Develop theoretical results for diploid, geographically subdivided populations.
- Compare different Ne measures (NeI, NeV) in local and global contexts.
- Introduce and evaluate a new additive genetic variance effective size (NeAV) for species conservation.
Main Methods:
- Mathematical modeling of population subdivision.
- Comparison of haploid and diploid effective size formulations.
- Introduction of a novel measure for migration-drift equilibrium deviation.
Main Results:
- Local NeV is often smaller than both haploid and diploid NeI.
- Global NeV approximates haploid NeI and exceeds diploid NeI.
- NeAV is closely related to haploid NeI and relevant for additive genetic variance loss.
Conclusions:
- New Ne metrics provide deeper insights into genetic dynamics in structured populations.
- Findings have significant implications for conservation strategies and managing genetic diversity.
- The study advances understanding of migration-drift equilibrium and its timescale.
Keywords:
Coancestry coefficientDiploid populationEffective population sizeInbreeding coefficientMigration–drift equilibriumMore Related Videos
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