Multiple Insemination and Male Sexual Selection in Natural Populations of Drosophila pseudoobscura

Cobbs, Gary

doi:10.1086/283197

Cited by 95 publications

(77 citation statements)

References 17 publications

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“…Nearly all females were inseminated and carried sufficient sperm to produce a sizable number of offspring. It has been known for many years that Drosophila males mate repeatedly, and recently evidence has been advanced that females do so as well (21)(22)(23)(24)(25). A large fraction of D. pseudoobscura females carry the sperm of two or more males (21,23,25).…”

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“…It has been known for many years that Drosophila males mate repeatedly, and recently evidence has been advanced that females do so as well (21)(22)(23)(24)(25). A large fraction of D. pseudoobscura females carry the sperm of two or more males (21,23,25). Whether sperm from the last copulation displace those from earlier matings is not known for this species, although such a sperm displacement has been shown for D. melanogaster in the laboratory (26 This reasoning is based on the assumption that other components of fitness do not confound our analysis, and in particular that karyotypic frequencies in adult males and females are alike, or nearly so.…”

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Evidence for selection by male mating success in natural populations of Drosophila pseudoobscura.

Anderson¹,

Levine²,

Olvera³

et al. 1979

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

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Gene arrangement frequencies were determined at two stages in the life history of Drosophila pseudoobscura taken from nature. Three po ulations in the central highlands of Mexico were each sampled twice during 1976.Gene arrangement frequencies were measured in adult males and in larvae that were the offspring of females collected at the same time. The adult males were in all likelihood a representative sample of those who fathered the larvae produced by the wild females. Differences in gene arrangement frequency between these two life stages should indicate the operation of natural selection. One-third of our comparisons of common gene arrangement frequencies in males and in larvae from the next generation were statistically significant, as were one-third of our comparisons of total frequency arrays in the two life stages. We consider the components of selection that could produce such frequency changes and reason that male mating success must be the major one. Gene arrangement frequencies in the Mexican populations fluctuate within wide bounds. Selection must act to retain the polymorphism in the face of this flux in gene arrangement frequencies, and we suggest that male mating success plays an important role. One of the early triumphs of ecological genetics was the demonstration that selection in nature could be intense-in fact, one or several orders of magnitude more powerful than the founders of population genetics imagined. No experimental system played a more important role in the analysis of selection than the chromosomal polymorphism for gene arrangements in Drosophila pseudoobscura. In this species a series of inversions on the third chromosome binds large blocks of genes together as units, just as though they were alleles of a single "supergene." Natural selection was first implicated when Dobzhansky (2) showed that the frequencies of certain gene arrangements went through seasonal cycles in two of three populations on Mt. San Jacinto in California; subsequent studies showed that these cycles were repeated in years scattered over a span of 2 decades (3, 4). The frequencies of gene arrangements in the third population on Mt. San Jacinto did not cycle, but between 1939 and 1946 they underwent a directional change that Dobzhansky (5) also ascribed to natural selection. Dobzhansky and Levene (6) then showed that karyotypic frequencies in eggs laid by wild females were generally in accord with Hardy-Weinberg expectations, but that frequencies in wild males were not. They concluded that the karyotypes suffered differential mortality during the transition from fertilized egg to adult fly. That selection on the D. pseudoobscura inversions occurred in nature seemed to be settled, and it was generally taken for granted that viability differences accounted for the major part of it.Some 20 years later, a series of papers by Prout (7-10) stimulated evolutionary biologists to pay greater attention to the various components to fitness. These components determine the separate bits of selection that operate at...

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Evidence for selection by male mating success in natural populations of Drosophila pseudoobscura.

Anderson¹,

Levine²,

Olvera³

et al. 1979

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

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“…Furthermore, in nature D. pseudoobscura females are known to mate with up to four males 16,17 and D. melanogaster females with up to six. 18 Average progeny production by wild-caught females ( Table 2) varied significantly ( Table 3) among species.…”

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confidence: 99%

The wild side of life

Markow

Beall

Castrezana

2012

Fly

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“…However, three attributes of this species together make the assumptions of a haploid model less unrealistic: repeated mating by both sexes, large numbers of offspring, and nearly one-to-one sex ratios in nature. Multiple paternity in broods of Drosophila species is very commonly observed (e.g., Anderson 1974;Cobbs 1977;Gromko and Markow 1993;Harshman and Clark 1998) and the rapid spread of this species would not be possible without large numbers of offspring per female. We thus feel that our method still captures much of the essence of the colonization process in this species, but may be biased if applied to some other taxa.…”

Section: Assumptions Of Model and Comparison To Other Methodologiesmentioning

confidence: 99%

Genetic Variation in the Spread of Drosophila Subobscura From a Nonequilibrium Population

Noor

Pascual²,

Smith

2000

Evolution

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Abstract. Drosophila subobscura was first identified in North America in the early 1980s, and a newer D. subobscura population in Utah appears to have been established more than 10 years later. In this study, we use nuclear microsatellite allele frequencies, mitochondrial restriction fragment length polymorphism (RFLP) allele frequencies, and computer simulations to investigate possible scenarios of how this species has spread across North America. Our method develops a 95% confidence interval for the maximum and minimum number of founders that could have colonized the new population given various scenarios for spread. Unlike many other methods, it may be applied to nonequilibrium source populations given certain conditions. We find that observed allele frequency differences between newer and older D. subobscura populations are consistent with very few inseminated females being transported east from the coast in a single step or with larger numbers of colonizers invading after several intermediate steps. They are not consistent with a large, panmictic population of D. subobscura colonizing Utah in a single step.

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Multiple Insemination and Male Sexual Selection in Natural Populations of Drosophila pseudoobscura

Cited by 95 publications

References 17 publications

Evidence for selection by male mating success in natural populations of Drosophila pseudoobscura.

Evidence for selection by male mating success in natural populations of Drosophila pseudoobscura.

The wild side of life

Genetic Variation in the Spread of Drosophila Subobscura From a Nonequilibrium Population

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