Temporal Stability of Third-Chromosome Inversion Frequencies in Drosophila persimilis and D. pseudoobscura

Coyne, Jerry A.; Moore, Betty C.; Moore, J.; Powell, Jeffrey R.; Taylor, Charles

doi:10.2307/2409959

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…If the inversion also happens to capture recessive deleterious alleles at other loci, this can generate associative overdominance that will stabilize the inversion at an intermediate frequency. This situation is consistent with the stable inversion polymorphisms observed, for example, in natural populations of D. persimilis (Coyne et al 1992) and laboratory populations of D. pseudoobscura (Dobzhansky 1954;Wallace 1968;Ohta 1971). If the fitnesses of alleles involved in local adaptation vary with environmental conditions, as suggested by laboratory experiments on flies (Dobzhansky 1954), then the inversion frequencies could cycle seasonally, as is seen in D. pseudoobscura (Epling et al 1953;Dobzhansky 1971).…”

Section: Discussionsupporting

confidence: 81%

Chromosome Inversions, Local Adaptation and Speciation

2006

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We study the evolution of inversions that capture locally adapted alleles when two populations are exchanging migrants or hybridizing. By suppressing recombination between the loci, a new inversion can spread. Neither drift nor coadaptation between the alleles (epistasis) is needed, so this local adaptation mechanism may apply to a broader range of genetic and demographic situations than alternative hypotheses that have been widely discussed. The mechanism can explain many features observed in inversion systems. It will drive an inversion to high frequency if there is no countervailing force, which could explain fixed differences observed between populations and species. An inversion can be stabilized at an intermediate frequency if it also happens to capture one or more deleterious recessive mutations, which could explain polymorphisms that are common in some species. This polymorphism can cycle in frequency with the changing selective advantage of the locally favored alleles. The mechanism can establish underdominant inversions that decrease heterokaryotype fitness by several percent if the cause of fitness loss is structural, while if the cause is genic there is no limit to the strength of underdominance that can result. The mechanism is expected to cause loci responsible for adaptive species-specific differences to map to inversions, as seen in recent QTL studies. We discuss data that support the hypothesis, review other mechanisms for inversion evolution, and suggest possible tests.

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Section: Discussionsupporting

confidence: 81%

Chromosome Inversions, Local Adaptation and Speciation

2006

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“…No information is available on the interaction of D. subobscura and D. persimilis since no D. persimilis were captured in my collections. This absence is unusual, since Dobzhansky and Epling (1944) noted that it was once abundant very near Goldendale, and Coyne et al (1992) captured several D. persimilis females in Seattle and Bellingham in the early 1980s in August/September. Additionally, I analyzed the chromosomes from native obscura-subgroup flies that were collected in Seattle in September 1993, and again, all were D. pseudoobscura (N=26).…”

Section: Resultsmentioning

confidence: 95%

Diurnal Activity Patterns of Drosophila subobscura and D. pseudoobscura in Sympatric Populations

Noor

1998

The American Midland Naturalist

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The Old World species, Drosophila subobscura, has recently invaded North America and become sympatric with the native obscura-group species. This study investigates the summer diurnal activity patterns of two northwestern North American populations of Drosophila subobscura and compares them to the documented Old World trend as well as that of its native North American congener, D. pseudoobscura. Both species peak in activity at temperatures between 15 and 20 C, and activity in both species increases with decreasing sun angles, thus causing high levels of activity near sunrise and sunset. However, D. subobscura becomes more abundant than D. pseudoobscura at lower temperatures and sun angles. No differences in diurnal activity were noted between Old World and New World D. subobscura. Drosophila subobscura might have contributed to the reduced abundance of a native species, D. persimilis, in areas of recent sympatry, though this causal connection is not certain.

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“…Few variations have been observed over this period, excepting for PP and TL arrangements. Several natural populations of D. persimilis, a sibling species of D. pseudoobscura have also been sampled during a long period, but no changes were detected (Coyne et al .1992). Some populations of D. robusta did not show significant consistent temporal changes (Carson 1958) but others showed some significant changes (Levitan 1982;Etges 1984).…”

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confidence: 99%

Temporal Changes in Chromosomal Polymorphism of Drosophila subobscura Related to Climatic Changes

Orengo¹,

Prevosti²

1996

Evolution

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Temporal Stability of Third-Chromosome Inversion Frequencies in Drosophila persimilis and D. pseudoobscura

Abstract: Why are offspring born larger when it is colder? Phenotypic plasticity for offspring size in the cladoceran Simocephalus vetulus (Miiller).

Cited by 6 publications

References 7 publications

Chromosome Inversions, Local Adaptation and Speciation

Chromosome Inversions, Local Adaptation and Speciation

Diurnal Activity Patterns of Drosophila subobscura and D. pseudoobscura in Sympatric Populations

Temporal Changes in Chromosomal Polymorphism of Drosophila subobscura Related to Climatic Changes

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