Quantitative analysis of genetic differentiation among European and Chilean strains of Drosophila subobscura

Budnik, Myriam; Cifuentes, L; Brncic, Danko

doi:10.1038/hdy.1991.61

Cited by 18 publications

(17 citation statements)

References 11 publications

(12 reference statements)

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“…The same table shows the larva-to-adult viabilities, developmental times and E-statistic, always favouring haplotype II, although statistically different were only found in the DT and E. However, in both experiments, the developmental times were longer than those of previous studies (Rocha Pité, 1982) where this species developed faster even at lower temperatures. In both strains, the viabilities were low and in the same range as those found in the literature (Budnik et al, 1991). The survival curves for the adult males and females of both haplotypes are shown in Figure 1.…”

Section: Resultssupporting

confidence: 65%

Fitness and life-history traits of the two major mitochondrial DNA haplotypes of Drosophila subobscura

et al. 2004

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Mitochondrial DNA restriction site analyses on natural populations of Drosophila subobscura have proved the existence of two common, coexisting haplotypes (I and II), as well as a set of less frequent ones derived from them. To explain this distribution, experiments to date point practically to all possible genetic mechanisms being involved in the changes of gene frequencies (cytonuclear coadaptation, direct natural selection on mtDNA and genetic drift). In an attempt to find differences that help to understand the dynamics of these haplotypes and to detect the effect of selection, we measured certain fitness components and life-history traits (egg-larva and larva-adult viabilities and developmental times, longevity, resistance to desiccation and optimal density) of the two main haplotypes I and II when maintained in laboratory population cages. As a general trend, haplotype II showed a higher net fitness than haplotype I, which explains the superiority of haplotype II over haplotype I in experimental populations but not their coexistence in nature, where additional factors must be considered.

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Section: Resultssupporting

confidence: 65%

Fitness and life-history traits of the two major mitochondrial DNA haplotypes of Drosophila subobscura

et al. 2004

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“…Wing length and body size increase towards the north (Prevosti, 1955;Pfriem, 1983). Developmental time and viability of egg-to-adult depend on locality (Budnik et al, 1991). Developmental times of pupa-to-adult were dependent on strain (this stUdy), and correlated with r in the same way as among the per mutants of D. melanogaster (Kyriacou et al, 1990).…”

Section: North-south Differences In the Rhythmsupporting

confidence: 50%

“…The egg-to-adult development time of D. subobscura is known to be variable between geographical strains (Budnik et al, 1991). The duration of emergence in a mixed age pupal cohort is a rough measure of the time from pupation to eclosion (Ikeda & Saito, 1983;Kyriacou et a!., 1990).…”

Section: North-south Differences In the Rhythmmentioning

confidence: 99%

North–south differences in circadian eclosion rhythm in European populations of Drosophila subobscura

Lankinen

1993

Heredity

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The circadian pupal eclosion rhythm was studied in 12 strains of Drosophila subobscura originating from two regions: Scandinavia (56-63°N), and the Canary Islands (28°N). Inmost parameters of the rhythm, ample variability was found both within and between the regions. Among the strains the phase of the eclosion median in an entraining die! light-dark cyc!e varied by 8.1 h, and the period of the free-running rhythm (r) by 2.2 h. In the comparison between the two regions, the Scandinavian entrained rhythm had on average a 2.8 h ear!ier phase, r was 0.9 h shorter, and the amplitude of the rhythm was lower. Of the rhythm parameters, early phase was correlated with short r (r = 0.76), and the amplitude of the entrained rhythm was correlated with the amplitude of the free-running rhythm (r =0.98). In addition to the geographica! variation, a putative arhythmic recessive autosomal mutant was found to segregate in one Scandinavian strain. The lack of photoperiodic adult diapause was confirmed in D. subobscura. The results show that the circadian eclosion rhythm in a nonphotoperiodic species can vary latitudinally in a fashion simi!ar to that of photoperiodic species.

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“…For example, wing length increases clinally with latitude in the baseline, Old World populations (Prevosti 1955;Misra and Reeve 1964;Pfreim 1983;Pegueroles et al 1995;Huey et al 2000;Gilchrist et al 2001). No wing-size cline was evident in North or in South America one decade after the invasion (Budnik et al 1991;Pegueroles et al 1995), but a significant cline was evident after two decades in North American populations (Huey et al 2000;Gilchrist et al 2001; note that South American patterns are currently under study). Thus the evolution of wing-size clines appeared undetectable at first, and became apparent only later-just the opposite pattern seen with inversions.…”

Section: Discussionmentioning

confidence: 90%

Evolutionary Pace of Chromosomal Polymorphism in Colonizing Populations of Drosophila Subobscura: An Evolutionary Time Series

et al. 2003

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Biologists have long debated the speed, uniformity, and predictability of evolutionary change. However, evaluating such patterns on a geographic scale requires time-series data on replicate sets of natural populations. Drosophila subobscura has proven an ideal model system for such studies. This fly is broadly distributed in the Old World, but was introduced into both North and South America just over two decades ago and then spread rapidly. Rapid, uniform, and predictable evolution would be demonstrated if the invading flies evolved latitudinal clines that progressively converged on those of the native populations. Evolutionary geneticists quickly capitalized on this opportunity to monitor evolutionary dynamics. Just a few years after the introduction, they surveyed chromosomal inversion frequencies in both North and South America. On both continents they detected incipient latitudinal clines in chromosome inversion frequencies that almost always had the same sign with latitude as in the Old World. Thus the initial evolution of chromosomal polymorphisms on a continental scale was remarkably rapid and consistent. Here we report newer samples of inversion frequencies for the colonizing populations: the time series now spans almost one decade for North America and almost two decades for South America. Almost all inversions in the New World continue to show the same sign of frequency with latitude as in the Old World. Nevertheless, inversion clines have not consistently increased in steepness over time; nor have they consistently continued to converge on the Old World baseline. However, five arrangements in South America show directional, continentwide shifts in frequency. Overall, the initial consistency of clinal evolutionary trajectories seen in the first surveys seems not to have been maintained.

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Quantitative analysis of genetic differentiation among European and Chilean strains of Drosophila subobscura

Cited by 18 publications

References 11 publications

Fitness and life-history traits of the two major mitochondrial DNA haplotypes of Drosophila subobscura

Fitness and life-history traits of the two major mitochondrial DNA haplotypes of Drosophila subobscura

North–south differences in circadian eclosion rhythm in European populations of Drosophila subobscura

Evolutionary Pace of Chromosomal Polymorphism in Colonizing Populations of Drosophila Subobscura: An Evolutionary Time Series

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