PATTERNS OF PARAPATRIC SPECIATION

@inproceedings{Gavrilets2000PATTERNSOP,
  title={PATTERNS OF PARAPATRIC SPECIATION},
  author={Sergey Gavrilets and Hai Li and Michael D. Vose},
  booktitle={Evolution; international journal of organic evolution},
  year={2000}
}
Abstract Geographic variation may ultimately lead to the splitting of a subdivided population into reproductively isolated units in spite of migration. Here, we consider how the waiting time until the first split and its location depend on different evolutionary factors including mutation, migration, random genetic drift, genetic architecture, and the geometric structure of the habitat. We perform large-scale, individual-based simulations using a simple model of reproductive isolation based on… 

First passage time to allopatric speciation

There is an intermediate optimal rate of migration that maximizes the rate of species creation by recurrent invasion and diversification and if the number of invasive individuals relative to the resident population is not very large, diffusion approximation provides an accurate prediction.

Waiting time to parapatric speciation

  • S. Gavrilets
  • Biology
    Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 2000
Using a weak migration and weak mutation approximation, the average waiting time to parapatric speciation is studied using the classical Dobzhansky model and its recently proposed multilocus generalizations.

Isolation-by-Distance and Outbreeding Depression Are Sufficient to Drive Parapatric Speciation in the Absence of Environmental Influences

A 2-D cellular automata model showing that an initially homogeneous population might spontaneously subdivide into reproductively incompatible species through sheer isolation-by-distance when the viability of offspring decreases as the genomes of parental gametes become increasingly different is proposed.

Parapatric speciation in three islands: dynamics of geographical configuration of allele sharing

The model showed that the low number of incompatibility loci facilitates parapatric speciation and that migrants arriving as a group shorten the waiting time to speciation compared with the same number of migrants arriving individually.

Diversity patterns and speciation processes in a two‐island system with continuous migration

A two-island neutral model of speciation with continuous migration is considered and diversity patterns are studied as a function of the migration probability, population size, and number of genes involved in reproductive isolation (dubbed as genome size).

SPECIATION DESPITE GENE FLOW WHEN DEVELOPMENTAL PATHWAYS EVOLVE

It is shown that, although gene exchange does inhibit this process, it is the proportion of migrants exchanged rather than the number of migrants that is critical, and rates as high as 16 individuals exchanged per generation still permit the evolution of postzygotic isolation.

DYNAMICS OF SPECIATION AND DIVERSIFICATION IN A METAPOPULATION

This framework can be used to approach a number of questions such as species‐area distribution, species‐range size distribution, the rate of ecological turnover, asymmetries of range division between sister species, waiting time until speciation and extinction, the relationship between the geographic range size and the probability of speciation, and the relationships between subpopulation‐level parameters and metapopulation‐ level parameters.

Waiting time to (and duration of) parapatric speciation

Using a weak migration and weak mutation approximation, I study the average waiting time to and the average duration of parapatric speciation. The description of reproductive isolation used is based

Conditions for mutation-order speciation

Simulation models used to study how gene flow, hybrid incompatibility, selective advantage, timing of origination of new mutations and an initial period of allopatric differentiation affect population divergence via the mutation-order process find that at least some population divergence can occur under a reasonably wide range of conditions, even with moderate gene flow.
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References

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