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Competition enhances spatial genetic differentiation

Ranta, Esa; Bach, Lars LU ; Kaitala, Veijo; Bjorklund, Mats and Lundberg, Per LU (2009) In Evolutionary Ecology Research 11(8). p.1251-1258
Abstract
Questions: How does the number of species in a community affect the level of genetic diversity of its constituent species? What is the relation between competitive interactions and the spatial distribution of genetic variation? When spatially structured, how is the genetic differentiation among subpopulations affected by competition and size of the community? Model features and key assumptions: A model combining one-locus two-allele genetics with density-dependent regulation in population renewal (Ricker function) and demographic stochasticity is extended to incorporate S-species Lotka-Volterra competition. The system is embedded into a spatial context where 1000 populations are connected with stepping-stone dispersal. Beginning from... (More)
Questions: How does the number of species in a community affect the level of genetic diversity of its constituent species? What is the relation between competitive interactions and the spatial distribution of genetic variation? When spatially structured, how is the genetic differentiation among subpopulations affected by competition and size of the community? Model features and key assumptions: A model combining one-locus two-allele genetics with density-dependent regulation in population renewal (Ricker function) and demographic stochasticity is extended to incorporate S-species Lotka-Volterra competition. The system is embedded into a spatial context where 1000 populations are connected with stepping-stone dispersal. Beginning from random genotype composition, the system is simulated and the resulting community composition and genetic diversity across space are recorded. Conclusions: Genetic differentiation in the ensemble increases with the number of competing species in the community (0.30 +/- 0.13, normalized coefficient with 95% confidence limit) and with the intensity of pair-wise competition (0.20 +/- 0.05) but most strongly with their interaction (0.62 +/- 0.22). Although the system-wide differentiation increases, one finds that the process leads to local paucity of genotypes and hence a negative correlation between species diversity and local genetic diversity. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
structure, spatial, Lotka-Volterra, F-ST, community genetics, competition, species diversity, stepping-stone
in
Evolutionary Ecology Research
volume
11
issue
8
pages
1251 - 1258
publisher
Evolutionary Ecology Ltd
external identifiers
  • wos:000273289700007
  • scopus:73849086193
ISSN
1522-0613
language
English
LU publication?
yes
id
8ad54e96-f29d-4e57-a1ef-ca0f12286527 (old id 1546811)
date added to LUP
2010-02-25 12:55:20
date last changed
2017-01-01 05:37:58
@article{8ad54e96-f29d-4e57-a1ef-ca0f12286527,
  abstract     = {Questions: How does the number of species in a community affect the level of genetic diversity of its constituent species? What is the relation between competitive interactions and the spatial distribution of genetic variation? When spatially structured, how is the genetic differentiation among subpopulations affected by competition and size of the community? Model features and key assumptions: A model combining one-locus two-allele genetics with density-dependent regulation in population renewal (Ricker function) and demographic stochasticity is extended to incorporate S-species Lotka-Volterra competition. The system is embedded into a spatial context where 1000 populations are connected with stepping-stone dispersal. Beginning from random genotype composition, the system is simulated and the resulting community composition and genetic diversity across space are recorded. Conclusions: Genetic differentiation in the ensemble increases with the number of competing species in the community (0.30 +/- 0.13, normalized coefficient with 95% confidence limit) and with the intensity of pair-wise competition (0.20 +/- 0.05) but most strongly with their interaction (0.62 +/- 0.22). Although the system-wide differentiation increases, one finds that the process leads to local paucity of genotypes and hence a negative correlation between species diversity and local genetic diversity.},
  author       = {Ranta, Esa and Bach, Lars and Kaitala, Veijo and Bjorklund, Mats and Lundberg, Per},
  issn         = {1522-0613},
  keyword      = {structure,spatial,Lotka-Volterra,F-ST,community genetics,competition,species diversity,stepping-stone},
  language     = {eng},
  number       = {8},
  pages        = {1251--1258},
  publisher    = {Evolutionary Ecology Ltd},
  series       = {Evolutionary Ecology Research},
  title        = {Competition enhances spatial genetic differentiation},
  volume       = {11},
  year         = {2009},
}