FOUNDER‐FLUSH SPECIATION IN DROSOPHILA PSEUDOOBSCURA: A LARGE‐SCALE EXPERIMENT

@article{Galiana1993FOUNDERFLUSHSI,
  title={FOUNDER‐FLUSH SPECIATION IN DROSOPHILA PSEUDOOBSCURA: A LARGE‐SCALE EXPERIMENT},
  author={Agust{\'i} Galiana and Andr{\'e}s Moya and Francisco Jos{\'e} Ayala},
  journal={Evolution},
  year={1993},
  volume={47}
}
A founder‐flush‐crash model of speciation has been proposed that may particularly apply to island and other colonizations. Previous laboratory experiments testing the model have given inconsistent results. We have conducted a large experiment with Drosophila pseudoobscura designed to meet the essential postulates of the model and to separately test some of the postulates. Forty‐five experimental and 12 control populations have been studied during seven successive founder‐flush‐crash cycles, or… 
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Citation Type

SINGLE FOUNDER‐FLUSH EVENTS AND THE EVOLUTION OF REPRODUCTIVE ISOLATION
TLDR
Results indicate that none of 50 independent founder‐flush lines evolved significant assortative mating relative to the control population, which suggests a diminished emphasis on population bottlenecks in speciation of D. melanogaster and perhaps in general.
POSTMATING ISOLATION ANALYSIS IN FOUNDER‐FLUSH EXPERIMENTAL POPULATIONS OF DROSOPHILA PSEUDOOBSCURA
TLDR
A detailed analysis intended to detect postmating barriers in experimental populations of Drosophila pseudoobscura obtained through nine founderflush cycles found that the evolution of premating barriers, as shown by two of these populations, is not necessarily accompanied by the Evolution of postmates ones.
A direct experimental test of founder‐flush effects on the evolutionary potential for assortative mating
TLDR
Multivariate analyses on the courtship repertoires found that, although both bottlenecked and nonbottlenecked treatments attained similar levels of assortative mating, the treatments exhibited different evolutionary solutions in their correlated responses, suggesting that the bottlenecked lines had greater potential for the evolution of novel phenotypes as predicted by founder‐induced speciation models.
DIVERGENT ENVIRONMENTS AND POPULATION BOTTLENECKS FAIL TO GENERATE PREMATING ISOLATION IN DROSOPHILA PSEUDOOBSCURA
TLDR
The novel environment did not cause the evolution of any premating isolation and it reduced the likelihood of speciation through its effects on male mating success, both as a plastic response to this environment and as a result of environment‐dependent inbreeding effects in the bottlenecked populations.
Origin of sexual isolation in Drosophila ananassae due to founder effects
TLDR
Findings provide evidence for origin of sexual isolation by founder effects in D. ananassae by using Bonferroni test for pair-wise analysis and significant differences between homogamic and heterogamic matings were found in 25 crosses.
Laboratory environments are not conducive for allopatric speciation
TLDR
It is suggested that allopatric speciation experiments are more likely to yield conclusive results under divergent selection than under drift, and points to the benefits of large populations and many generations.
DIVERGENT ENVIRONMENTS AND POPULATION BOTTLENECKS FAIL TO GENERATE PREMATING ISOLATION IN DROSOPHILA PSEUDOOBSCURA
  • H. Rundle
  • Medicine
    Evolution; international journal of organic evolution
  • 2003
TLDR
The novel environment did not cause the evolution of any premating isolation and it reduced the likelihood of speciation through its effects on male mating success, both as a plastic response to this environment and as a result of environment-dependent inbreeding effects in the bottlenecked populations.
PRESUMPTIVE RAPID SPECIATION AFTER A FOUNDER EVENT IN A LABORATORY POPULATION OF NEREIS: ALLOZYME ELECTROPHORETIC EVIDENCE DOES NOT SUPPORT THE HYPOTHESIS
TLDR
The Lab population was already a species different from PI and P2 at the time when it was originally sampled in 1964, and is genetically depauperate, most likely as a consequence of the founder event, but this reduced variability contributes only trivially to the genetic differentiation between the populations.
Convergent evolution of the mating behaviour of founder‐flush populations of the housefly
TLDR
This study demonstrates how convergent evolution can dissolve founder‐flush effects and shows significant evolutionary potential in courtship, along with homogamic and heterogamic preferences.
Assortative Mating and Fertility in two Drosophila subobscura Strains with different Mitochondrial DNA Haplotypes
The mating pattern and female fertility on the two main mitochondrial DNA haplotypes (I and II) of Drosophila subobscura were studied, in an attempt to find possible differences between them in…
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