FOUNDER‐FLUSH SPECIATION: AN UPDATE OF EXPERIMENTAL RESULTS WITH
            <i>DROSOPHILA</i>

Dodd, Diane M. B.; Powell, Jeffrey R.

doi:10.1111/j.1558-5646.1985.tb05704.x

Cited by 43 publications

(50 citation statements)

References 19 publications

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“…One important early study of ethological isolation from founder populations in chromosomally rearranged lineages of D. suboobscura found the most pronounced isolation for the only line homozygous for a chromosomal inversion, in which recombination is meaningless (Dodd and Powell, 1985). More recent work on D. suboobscura has indicated that the frequencies of certain inversions within both natural and laboratory populations are strongly correlated with different temperature regimes and seasons (Orengo and Prevosti, 1996;Kamping and Van Delden, 1999).…”

Section: Conversion With Physical Limits On Recombination Chromosomalmentioning

confidence: 99%

The conversion of variance and the evolutionary potential of restricted recombination

Neiman

Linksvayer

2005

Heredity

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Genetic recombination is usually considered to facilitate adaptive evolution. However, recombination prevents the reliable cotransmission of interacting gene combinations and can disrupt complexes of coadapted genes. If interactions between genes have important fitness effects, restricted recombination may lead to evolutionary responses that are different from those predicted from a purely additive model and could even aid adaptation. Theory and data have demonstrated that phenomena that limit the effectiveness of recombination via increasing homozygosity, such as inbreeding and population subdivision and bottlenecks, can temporarily increase the additive genetic variance available to these populations. This effect has been attributed to the conversion of nonadditive to additive genetic variance.Analogously, phenomena such as chromosomal inversions and apomictic parthenogenesis that physically restrict recombination in part or all of the genome may also result in a release of additive variance. Here, we review and synthesize literature concerning the evolutionary potential of populations with effectively or physically restricted recombination. Our goal is to emphasize the common theme of increased short-term access to additive genetic variance in all of these situations and to motivate research directed towards a more complete characterization of the relevance of the conversion of variance to the evolutionary process.

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Section: Conversion With Physical Limits On Recombination Chromosomalmentioning

confidence: 99%

The conversion of variance and the evolutionary potential of restricted recombination

Neiman

Linksvayer

2005

Heredity

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“…As argued in the present article, however, such data are flawed as a measure of reproductive isolation. On the other hand, a few data sets do occur that can be explained as due simply to chance shifts by random drift in the complex genetics of the mate choice system between the newly bottlenecked population and its ancestral form (30).…”

Section: Selection Favoring Reproductive Isolating Barriers Is Questimentioning

confidence: 99%

Mate choice theory and the mode of selection in sexual populations

Carson

2003

Proc. Natl. Acad. Sci. U.S.A.

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Indirect new data imply that mate and͞or gamete choice are major selective forces driving genetic change in sexual populations. The system dictates nonrandom mating, an evolutionary process requiring both revised genetic theory and new data on heritability of characters underlying Darwinian fitness. Successfully reproducing individuals represent rare selections from among vigorous, competing survivors of preadult natural selection. Nonrandom mating has correlated demographic effects: reduced effective population size, inbreeding, low gene flow, and emphasis on deme structure. Characters involved in choice behavior at reproduction appear based on quantitative trait loci. This variability serves selection for fitness within the population, having only an incidental relationship to the origin of genetically based reproductive isolation between populations. The claim that extensive hybridization experiments with Drosophila indicate that selection favors a gradual progression of ''isolating mechanisms'' is flawed, because intragroup random mating is assumed. Over deep time, local sexual populations are strong, independent genetic systems that use rich fields of variable polygenic components of fitness. The sexual reproduction system thus particularizes, in small subspecific populations, the genetic basis of the grand adaptive sweep of selective evolutionary change, much as Darwin proposed.evolution ͉ genetic variability ͉ natural selection ͉ population genetics

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“…The clipping was performed on lightly anaesthetized flies using CO 2 gas, at the time they were ''sexed'' after emergence. It must be noted that the clipping does not affect mating propensity or discrimination (Petit et al 1976;Kilias et al 1980;Dodd and Powell 1985). Random mating was tested by chi-squared and the joint isolation index of Malogolowkin-Cohen (Malogolowkin-Cohen et al 1965) was calculated as follows:…”

Section: Measuring Sexual Isolationmentioning

confidence: 99%

Influence of Antibiotic Treatment and Wolbachia Curing on Sexual Isolation Among Drosophila Melanogaster Cage Populations

et al. 2006

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Abstract. Speciation depends on the establishment of reproductive isolation between populations of the same species. Whether assortative mating evolves as a by-product of adaptation is a major question relevant to the origin of species by reproductive isolation. The long-term selection populations used here were originally established 30 years ago from a single cage population (originating from a maternal one) and subsequently subjected to divergent selection for tolerance of toxins in food (heavy metals versus ethanol) to investigate this question. Those populations now differ in sexual isolation and Wolbachia infection status. Wolbachia are common and widespread bacteria infecting arthropods and nematodes. Attention has recently focused on their potential role in insect speciation, due to post-mating spermegg incompatibilities induced by the bacteria. In this paper we examine the potential effect of Wolbachia on the level of sexual isolation. By antibiotic curing, we show that removal of Wolbachia decreases levels of mate discrimination (sexual isolation index) between populations by about 50%. Backcrossing experiments confirm that this effect is due to infection status rather than to genetic changes in the populations resulting from antibiotic treatment. Antibiotic treatment has no effect on mate discrimination level between uninfected populations. Our findings suggest that the presence of Wolbachia (or another undetected bacterial associate) act as an additive factor contributing to the level of pre-mating isolation between these Drosophila melanogaster populations. Given the ubiquity of bacterial associates of insects, such effects could be relevant to some speciation events.

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FOUNDER‐FLUSH SPECIATION: AN UPDATE OF EXPERIMENTAL RESULTS WITH DROSOPHILA

Cited by 43 publications

References 19 publications

The conversion of variance and the evolutionary potential of restricted recombination

The conversion of variance and the evolutionary potential of restricted recombination

Mate choice theory and the mode of selection in sexual populations

Influence of Antibiotic Treatment and Wolbachia Curing on Sexual Isolation Among Drosophila Melanogaster Cage Populations

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