Divergent Selection for Geotactic Response and Evolution of Reproductive Isolation in Sympatric and Allopatric Populations of Houseflies

@article{Hurd1975DivergentSF,
  title={Divergent Selection for Geotactic Response and Evolution of Reproductive Isolation in Sympatric and Allopatric Populations of Houseflies},
  author={Lawrence E. Hurd and Robert M. Eisenberg},
  journal={The American Naturalist},
  year={1975},
  volume={109},
  pages={353 - 358}
}
Experimental populations of houseflies subjected to 95% selective pressure for geotactic preference under conditions of 50% potential gene flow and of allopatry evolved reproductive isolation after only 16 generations. No significant difference was found between sympatric and allopatric populations. Our study does not support the hypothesis that incipient reproductive isolation occurs more rapidly under conditions of sympatry than allopatry. 

Laboratory environments are not conducive for allopatric speciation

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.

Adaptation to desiccation resistance fails to generate pre- and postmating isolation in Drosophila melanogaster

The divergence between the desiccation and control populations of cuticular hydrocarbons, key traits that have been implicated in mate choice and sexual isolation in Drosophila, is demonstrated.

LABORATORY EXPERIMENTS ON SPECIATION: WHAT HAVE WE LEARNED IN 40 YEARS?

The role of geographical separation in generating allopatry has been overemphasized in the past and its role in generating diminished gene flow in combination with strong, discontinuous, and multifarious divergent selection, has been largely unappreciated.

Effective population size may limit the power of laboratory experiments to demonstrate sympatric and parapatric speciation

This study demonstrates that the experimental evidence frequently used as an argument against sympatric and parapatric speciation models is not as strong as previously believed.

Pleiotropic effects of environment-sensitive genes affecting fitness in relation to postmating reproductive isolation

A verbal model is described in which gene flow is no longer seen as being first interrupted by a mere physical barrier and one is concerned with the environment-sensitivity of the mutations implicated in the process, and the other with their presumed pleiotropic action on a behavioural trait.

Investigating the relative influence of genetic drift and natural selection in shaping patterns of population structure in Delphinids (Delphinus delphis; Tursiops spp.)

Large mitogenomic sequences were used to investigate the worldwide phylogeography of several ecotypes/species within the genus Tursiops, with a recent biogeographical calibration point being used to calculate divergence times.

Sympatric speciation: when is it possible?

The present analysis confirms the view that such a selection on sufficiently polymorphic traits for speciation is ecologically realistic and shows that populations with bimodal distributions of some genetically determined quantitative characters can have a considerable life-time.

BODY SIZE, NATURAL SELECTION, AND SPECIATION IN STICKLEBACKS

  • L. NagelD. Schluter
  • Biology, Environmental Science
    Evolution; international journal of organic evolution
  • 1998
Interspecific mate preferences in sympatric sticklebacks appears to be dominated by body size, implicating natural selection in the origin of species.

Non-Allopatric Speciation in Animals

The extent to which the theory and evidence amassed since 1963 warrant a major change in views of animal speciation is reviewed, and the theory of stasipatric speciation and purported cases of sympatrics associated with a shift to a new host are reviewed.

REPRODUCTIVE ISOLATION AS A CONSEQUENCE OF ADAPTIVE DIVERGENCE IN DROSOPHILA PSEUDOOBSCURA

  • D. Dodd
  • Biology
    Evolution; international journal of organic evolution
  • 1989
In an attempt to gain insight into the process of the development of reproductive isolation, eight populations of Drosophila pseudoobscura were studied

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