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14 results for “Drosophila yakuba”
Data from: Wolbachia acquisition by Drosophila yakuba-clade hosts and transfer of incompatibility loci between distantly related Wolbachia
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Data from: Correlated evolution of male and female reproductive traits drive a cascading effect of reinforcement in Drosophila yakuba
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Data from: The cost of reinforcement in Drosophila yakuba
When the ranges of two species overlap and the species can hybridize, some individuals may waste gametes on inviable or infertile hybrids. In these cases, enhanced reproductive isolation may evolve as a byproduct of selection against maladaptive hybridization in a process called reinforcement. On the slopes of the African island of São Tomé, Drosophila yakuba and its endemic sister species D. santomea have a well-demarcated hybrid zone. D. yakuba females from within this zone, but not from outside it, show an increase in gametic isolation from males of D. santomea. To understand why reinforced gametic isolation does not spread to the whole geographic range and stays confined to areas of secondary contact, we studied the associated costs of reinforced gametic isolation in D. yakuba by using a combination of natural collections and experimental evolution. We found that D. yakuba males from sympatric populations sire fewer progeny than allopatric males when the female involved in the mating is an allopatric female. The results here shown suggest that the advantageous nature of reinforcement in D. yakuba is local, as its associated costs (i.e., reduced male fertility) might prevent its dispersal outside the hybrid zone.
Temperature-dependent competitive outcomes between the fruit flies Drosophila santomea and D. yakuba
<p>We use these data to test whether temperature can indirectly affect the fitness of <i>Drosophila santomea</i> and <i>D. yakuba</i> by altering interspecific competitive outcomes. We show that, when raised in isolation, both <i>D. santomea</i> and <i>D. yakuba</i> display similar variation in relative fitness across temperatures of 18°C, 22°C, and 25°C. However, <i>D. santomea</i> has higher fitness than <i>D. yakuba</i> when experiencing interspecific competition at 18°C, while the inverse is true at 25°C. Patterns of fitness across thermal and competitive environments therefore indicate that the outcome of interspecific competition varies with temperature. We then use a 'coexistence' experiment to show that <i>D. santomea</i> is rapidly (within 8 generations) extirpated when maintained with <i>D. yakuba</i> at 25°C. By contrast, <i>D. santomea</i> remains as (or more) abundant than <i>D. yakuba</i> over the course of ~10 generations when maintained at 18°C. Results provide an example of how the thermal environment can affect interspecific competition and suggest that some species may become more prone to extinction under scenarios of climate change through indirect effects of the thermal environment on competitive advantages between species.</p>
Data from: Wolbachia in the Drosophila yakuba complex: pervasive frequency variation and weak cytoplasmic incompatibility, but no apparent effect on reproductive isolation
Three hybridizing species-the clade ((Drosophila yakuba, D. santomea), D. teissieri) -comprise the yakuba complex in the D. melanogaster subgroup. Their ranges overlap on Bioko and São Tomé, islands off west Africa. All three species are infected with Wolbachia, maternally inherited, endosymbiotic bacteria, best known for manipulating host reproduction to favor infected females. Previous analyses reported no cytoplasmic incompatibility (CI) in these species. However, we discovered that Wolbachia from each species cause intra- and interspecific CI. In D. teissieri, analyses of F1 and backcross genotypes show that both host genotype and Wolbachia variation modulate CI intensity. Wolbachia-infected females seem largely protected from intra- and interspecific CI, irrespective of Wolbachia and host genotypes. Wolbachia do not affect host mating behavior or female fecundity, within or between species. The latter suggests little apparent effect of Wolbachia on premating or gametic RI between host species. In nature, Wolbachia frequencies varied spatially for D. yakuba in 2009, with 76% (N = 155) infected on São Tomé, and only 3% (N = 36) infected on Bioko; frequencies also varied temporally in D. yakuba and D. santomea on São Tomé between 2009 and 2015. These temporal frequency fluctuations could generate asymmetries in interspecific mating success, and contribute to postzygotic RI. However, the fluctuations in Wolbachia frequencies that we observe also suggest that asymmetries are unlikely to persist. Finally, we address theoretical questions that our empirical findings raise about Wolbachia persistence when conditions fluctuate and about the stable coexistence of Wolbachia and host variants that modulate Wolbachia effects.
Temperature-dependent competitive outcomes between the fruit flies Drosophila santomea and D. yakuba
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Data from: The cost of reinforcement in Drosophila yakuba
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Data from: Wolbachia in the Drosophila yakuba complex: pervasive frequency variation and weak cytoplasmic incompatibility, but no apparent effect on reproductive isolation
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Data from: Hybridization in the Drosophila melanogaster subgroup: incomplete isolation among the three species of the yakuba complex
In the Drosophila melanogaster subgroup, the yakuba species complex, D. yakuba, D. santomea and D. teissieri have identical mitochondrial genomes in spite of nuclear differentiation. The first two species can be readily hybridized in the laboratory, and produce fertile females and sterile males. They also form hybrids in natural conditions. Nonetheless, the third species, D. teissieri, was thought to be unable to produce hybrids with either D. yakuba or D. santomea. This in turn posed the conundrum of why the three species shared a single mitochondrial genome. In this report we show that D. teissieri can indeed hybridize with both D. yakuba and D. santomea. The resulting female hybrids from both crosses are fertile, while the hybrid males are sterile. We also characterize six isolating mechanisms that might be involved in keeping the three species apart. Our results open the possibility of studying the history of introgression in the yakuba species complex and dissecting the genetic basis of interspecific differences between these three species by genetic mapping.
Data from: Hybridization in the Drosophila melanogaster subgroup: incomplete isolation among the three species of the yakuba complex
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Data from: Sequential adaptive introgression of the mitochondrial genome in Drosophila yakuba and D. santomea
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RNA profiling in Drosophila virilis and Drosophila yakuba
GEO Series GSE61222. Drosophila yakuba; Drosophila virilis. 2 samples. Type: Expression profiling by high throughput sequencing.
Expression analysis of Drosophila yakuba, D. santomea and hybrids to evaluate the large-X effect using Nimblegen 60-mer custom made arrays
GEO Series GSE38793. Drosophila yakuba x Drosophila santomea; Drosophila santomea; Drosophila yakuba. 18 samples. Type: Expression profiling by array.
Drosophila yakuba white prepupae vs. blue gut larvae
GEO Series GSE129. Drosophila melanogaster; Drosophila yakuba. 4 samples. Type: Expression profiling by array.
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