Frequency-Dependent Selection at the Payne Inversion in Drosophila melanogaster

Nassar, R.; Muhs, H. J.; Cook, R. D.

doi:10.2307/2407190

Cited by 17 publications

(16 citation statements)

References 3 publications

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“…In order to test whether our conditioning effect could originate a frequency-dependent selective mechanism, we performed an experiment in wlfich larvae of both genotypes (wild-type and mutant) were sown together in the same medium at different frequencies (mutant larvae at 5, 10, 30, 70, 90 and 95%), and later genotypic frequencies of adult emergencies were observed. Since we know from a series of works (Anxolab4h~re, 1971; Kojima & Huang, 1972;and Nassar et at., 1973) that larval density is a factor that decisively influences frequency-dependent selection, the present experiment was done at two densities (100 larvae and 200 larvae in 1.5 cc of medium, respectively).…”

Section: Resultsmentioning

confidence: 99%

Density and frequency-dependent selection on the singed locus of Drosophila melanogaster

1979

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Larva-to-adult viability of tile progeny of four different crosses involving genotypes of the singed locus (SII+/Sll + X sn+/Y, sn+/sn + x snqr/y, snqr/snq r x sn+/Y and snqr/snqr x snqr/y) under optimum and high competition densities, has been studied. The fact that at high density the snqr/sn qr x sn+/Y and sn+/sn + x snqr/y crosses show the highest and lowest viabilities, respectively, suggested the possibility of some type of facilitation between wild-type and mutant phenotypes.This hypothesis was checked in an experiment similar to the previous one, but in which media conditioned either by wild-type larvae or by mutant larvae, were used. It was found that in each conditioning the cross that showed the lowest viability was the one that produced larvae of the same phenotype as the conditioning larvae.In order to check if a conditioning effect of this sort could form the basis for a frequency-dependent selection mechanism, an experiment of direct competition between wild-type and mutant larvae at different frequencies and at two densities, was carried out. At the higher density, the results showed that when the frequency of either of the two genotypes is low its viability increases. On the other hand, when the frequency of either of these genotypes is lfigh its viability decreases. These results suggest the existence of a frequency-dependent selection mechanism in whicli an inverse relationslfip between frequency and adaptive value is established. It also demonstrates tile important effect of density on frequency-dependent selection.

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Section: Resultsmentioning

confidence: 99%

Density and frequency-dependent selection on the singed locus of Drosophila melanogaster

1979

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“…Recently, interest in density dependence has been stimulated by work on the related phenomenon of frequency dependent selection (Clarke, 1979). As a result there have been many studies of the effect of density on selective values in the laboratory (Kojima and Huang, 1972;Toié and Ayala, 1981;Van Delden, 1982;De Benedictus, 1977;Nassar et a!., 1973, Nassar, 1979 This work, mainly with Drosophila, suffers from the disadvantage that densities cannot easily be measured in the field. The data presented here demonstrate that in Coelopafrigida selective values vary with larval competition not only under controlled laboratory conditions but also in natural populations.…”

Section: Discussiorimentioning

confidence: 99%

The effect of larval density on an inversion polymorphism in the seaweed fly Coelopa frigida

1984

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SUMMARYThe seaweed fly, Coelopafrigida, is polymorphic for two gene arrangements on chromosome I. Inversion frequencies in natural populations are very stable, both geographically and temporally and there is a consistent excess of heterokaryotypes. Laboratory experiments are reported which demonstrate that the egg to adult viability of heterokaryotypes is higher than either homokaryotype. This advantage increases markedly with larval density. Field samples also show a strong correlation between larval density and relative viability, expressed as the excess of heterokaryotypes over Hardy-Weinberg expectations. Larvae of a closely related species, C. pilipes, contribute significantly to this density effect in natural populations.

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“…The larvae were daily wellfed with baker's yeast. This was done to avoid selection operating in the electrophoretic sample due to crowded culture conditions (Nassar, 1979).…”

Section: The Samplesmentioning

confidence: 99%

Non-random associations between Lap and Pept-1 loci and gene arrangements of chromosome O in D. subobscura ? experiments in laboratory populations

1987

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In this paper the well-known non-random associations between Lap and Pept-1 loci and gene arrangements of chromosome O are studied in laboratory populations of D. subobscura. An increase of the frequency of the allele Lap1.00, towards an equilibrium point (0.70), was found to be associated with an increase of the gene arrangement O3+4. This is an accordance to the associations found in natural populations. On the contrary no such an increase was observed in populations polymorphic for Lap and Pept-1 loci but homokaryotypic for gene arrangement O3+4+8 differing in the initial allele frequencies at these loci. Although epistatic selection cannot be completely ruled out, our results are better explained under the assumption of neutrality.

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Frequency-Dependent Selection at the Payne Inversion in Drosophila melanogaster

Cited by 17 publications

References 3 publications

Density and frequency-dependent selection on the singed locus of Drosophila melanogaster

Density and frequency-dependent selection on the singed locus of Drosophila melanogaster

The effect of larval density on an inversion polymorphism in the seaweed fly Coelopa frigida

Non-random associations between Lap and Pept-1 loci and gene arrangements of chromosome O in D. subobscura ? experiments in laboratory populations

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