Isolation by distance in populations with power-law dispersal
AbstractLimited dispersal of individuals between generations results in isolation by distance, in which individuals further apart in space tend to be less related. Classic models of isolation by distance assume that dispersal distances are drawn from a thin-tailed distribution and pr...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Oxford University Press
2023-01-01
|
| Series: | G3: Genes, Genomes, Genetics |
| Online Access: | https://academic.oup.com/g3journal/article-lookup/doi/10.1093/g3journal/jkad023 |
| _version_ | 1797788870428852224 |
|---|---|
| author | Tyler B Smith Daniel B Weissman |
| author_facet | Tyler B Smith Daniel B Weissman |
| author_sort | Tyler B Smith |
| collection | DOAJ |
| description |
AbstractLimited dispersal of individuals between generations results in isolation by distance, in which individuals further apart in space tend to be less related. Classic models of isolation by distance assume that dispersal distances are drawn from a thin-tailed distribution and predict that the proportion of the genome that is identical by descent between a pair of individuals should decrease exponentially with the spatial separation between them. However, in many natural populations, individuals occasionally disperse over very long distances. In this work, we use mathematical analysis and coalescent simulations to study the effect of long-range (power-law) dispersal on patterns of isolation by distance. We find that it leads to power-law decay of identity-by-descent at large distances with the same exponent as dispersal. We also find that broad power-law dispersal produces another, shallow power-law decay of identity-by-descent at short distances. These results suggest that the distribution of long-range dispersal events could be estimated from sequencing large population samples taken from a wide range of spatial scales. |
| first_indexed | 2024-03-13T01:42:42Z |
| format | Article |
| id | doaj.art-5d4b8153f034434593d4854f2340e688 |
| institution | Directory Open Access Journal |
| issn | 2160-1836 |
| language | English |
| last_indexed | 2024-03-13T01:42:42Z |
| publishDate | 2023-01-01 |
| publisher | Oxford University Press |
| record_format | Article |
| series | G3: Genes, Genomes, Genetics |
| spelling | doaj.art-5d4b8153f034434593d4854f2340e6882023-07-03T11:13:22ZengOxford University PressG3: Genes, Genomes, Genetics2160-18362023-01-0113410.1093/g3journal/jkad023Isolation by distance in populations with power-law dispersalTyler B Smith0Daniel B Weissmanhttps://orcid.org/0000-0002-7799-1573Department of Physics, Emory University, Atlanta, Georgia 30322, USA AbstractLimited dispersal of individuals between generations results in isolation by distance, in which individuals further apart in space tend to be less related. Classic models of isolation by distance assume that dispersal distances are drawn from a thin-tailed distribution and predict that the proportion of the genome that is identical by descent between a pair of individuals should decrease exponentially with the spatial separation between them. However, in many natural populations, individuals occasionally disperse over very long distances. In this work, we use mathematical analysis and coalescent simulations to study the effect of long-range (power-law) dispersal on patterns of isolation by distance. We find that it leads to power-law decay of identity-by-descent at large distances with the same exponent as dispersal. We also find that broad power-law dispersal produces another, shallow power-law decay of identity-by-descent at short distances. These results suggest that the distribution of long-range dispersal events could be estimated from sequencing large population samples taken from a wide range of spatial scales.https://academic.oup.com/g3journal/article-lookup/doi/10.1093/g3journal/jkad023 |
| spellingShingle | Tyler B Smith Daniel B Weissman Isolation by distance in populations with power-law dispersal G3: Genes, Genomes, Genetics |
| title | Isolation by distance in populations with power-law dispersal |
| title_full | Isolation by distance in populations with power-law dispersal |
| title_fullStr | Isolation by distance in populations with power-law dispersal |
| title_full_unstemmed | Isolation by distance in populations with power-law dispersal |
| title_short | Isolation by distance in populations with power-law dispersal |
| title_sort | isolation by distance in populations with power law dispersal |
| url | https://academic.oup.com/g3journal/article-lookup/doi/10.1093/g3journal/jkad023 |
| work_keys_str_mv | AT tylerbsmith isolationbydistanceinpopulationswithpowerlawdispersal AT danielbweissman isolationbydistanceinpopulationswithpowerlawdispersal |