The evolution of reproductive isolation in the <i>Drosophila yakuba</i> complex of species

Turissini, David A.; Liu, G.; David, Jean R.; Matute, Daniel R.

doi:10.1111/jeb.12588

Cited by 34 publications

(71 citation statements)

References 100 publications

(138 reference statements)

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“…We recaptured 8.45% ( N = 91) of the D. teissieri , 11.31% ( N = 137) of the D. yakuba , and 30% ( N = 43) of the hybrid males that we released. In all cases, recaptured hybrid males did not have motile sperm, confirming our genotype assignments [11]. The estimated mean probability of choosing forest habitat differed among D. teissieri (0.97), D. yakuba (0.08), and hybrids (0.32) (LRT: P < 0.0001).…”

Section: Resultssupporting

confidence: 78%

“…This indicates that all hybrids were the F 1 sons of D. yakuba females and D. teissieri males [denoted F 1 (♀ yak × ♂ tei )]. Interestingly, the strength of reproductive isolation (RI) between reciprocal D. yakuba-D. teissieri crosses does not differ under standard laboratory conditions [11,12], leaving an open question about our inability to sample hybrids produced by D. teissieri females [denoted F 1 (♀ tei × ♂ yak )] on Bioko (see below).…”

Section: Resultsmentioning

confidence: 99%

“…Under standard laboratory conditions, non-ecological RI is equally strong between ♀ D. teissieri × ♂ D. yakuba and ♀ D. yakuba × ♂ D. teissieri crosses, and reciprocal hybrids do not differ in their survival rate [11,12,25]. This presents a conundrum; namely, what barriers might limit the prevalence and/or production of F 1 (♀ tei × ♂ yak ) hybrids in nature that are not revealed in the laboratory?…”

Section: Resultsmentioning

confidence: 99%

“…By measuring ecologically relevant phenotypes of D. yakuba , D. teissieri , and their hybrids in the lab and the field, our findings extend this knowledge to demonstrate temperature-dependent asymmetries in the strength of RI between reciprocal crosses. Notably, these two species also show other barriers to gene flow [11,12]. The role of biotic and abiotic conditions on facilitating hybridization and introgression remain largely understudied (but see [33]).…”

Section: Resultsmentioning

confidence: 99%

“…To further confirm genotype assignments, we dissected and mounted testes from all recaptured males on slides in Ringer’s solution and assessed sperm motility. Hybrid males are sterile and have no motile sperm, while non-hybrids are fertile with motile sperm [11,12]. …”

Section: Star Methodsmentioning

confidence: 99%

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A Maladaptive Combination of Traits Contributes to the Maintenance of a Drosophila Hybrid Zone

et al. 2018

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Drosophila teissieri and D. yakuba diverged approximately 3 mya and are thought to share a large, ancestral, African range [1-3]. These species now co-occur in parts of continental Africa and in west Africa on the island of Bioko [1, 4]. While D. yakuba is a human commensal, D. teissieri seems to be associated with Parinari fruits, restricting its range to forests [4-6]. Genome data indicate introgression, despite no evidence of contemporary hybridization. Here we report the discovery of D. yakuba-D. teissieri hybrids at the interface of secondary forests and disturbed, open habitats on Bioko. We demonstrate that hybrids are the F progeny of D. yakuba females and D. teissieri males. At high temperatures like those found on Bioko, D. teissieri females are generally less receptive to mating, and in combination with temperature effects on egg lay and egg-to-adult viability, this decreases the potential for gene flow between female D. teissieri and male D. yakuba relative to the reciprocal cross. Field and laboratory experiments demonstrate that F hybrids have a maladaptive combination of D. yakuba behavior and D. teissieri physiology, generating additional barriers to gene flow. Nevertheless, analysis of introgressed and non-introgressed regions of the genome indicate that, while rare, gene flow is relatively recent. Our observations identify precise intrinsic and extrinsic factors that, along with hybrid male sterility, limit gene flow and maintain these species. These data contribute to a growing body of literature that suggests the Gulf of Guinea may be a hotspot for hybridization.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Star Methodsmentioning

confidence: 99%

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A Maladaptive Combination of Traits Contributes to the Maintenance of a Drosophila Hybrid Zone

et al. 2018

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Biogeography and Evolution in the Oceanic Islands of the Gulf of Guinea

Melo

Ceríaco

Bell

2022

Biodiversity of the Gulf of Guinea Oceanic Islands

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As with most archipelagos, geography played a central role in the assembly and evolution of the endemic-rich biological communities of the Gulf of Guinea oceanic islands. The islands are located at moderate distances from the species-rich African continent that surrounds them to the east and north. This proximity facilitated colonization by many branches of the tree of life, but gene flow between the islands and continent was low enough that many lineages evolved in isolation once they reached the archipelago, resulting in many endemic species. Furthermore, several of the island taxa belong to groups typically considered to be “poor dispersers” across sea barriers, which strongly supports a role for natural rafts in seeding the islands. Oceanic currents, including the freshwater pathways that extend from large river drainages into the Gulf of Guinea during the rainy season, also support this hypothesis. The distances between the islands are equivalent to those between the islands and the continent such that inter-island dispersal events appear to be relatively rare and thus few taxa are shared between them. Still, the islands present multiple cases of secondary contact leading to hybridization and genetic introgression between closely related lineages—providing several models to study the role and consequences of gene flow in evolution. Most taxa for which molecular estimates of divergence time have been derived are much younger than the ages of the islands. This pattern is consistent with high species turnover, likely resulting from a combination of small island sizes, proximity to the African continent and a long history of intense volcanic activity. The Gulf of Guinea oceanic islands provide multiple examples of classical adaptations to island life (the “island syndrome”), including giants and dwarves, ornament and color loss, among others. In addition, emerging studies of birds are highlighting the importance of competition regimes in driving phenotypic change—with examples of both character release (low inter-specific competition) and character displacement (inter-specific competition upon secondary contact). Collectively, the Gulf of Guinea oceanic islands offer unique opportunities to study adaptation and speciation in a range of taxa and contexts.

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Long-term evolution of quantitative traits in the Drosophila melanogaster species subgroup

et al. 2022

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Quantitative genetics aims at untangling the genetic and environmental effects on phenotypic variation. Trait heritability, which summarizes the relative importance of genetic effects, is estimated at the intraspecific level, but theory predicts that heritability could influence long-term evolution of quantitative traits. The phylogenetic signal concept bears resemblance to heritability and it has often been called species-level heritability. Under certain conditions, such as trait neutrality or contribution to phylogenesis, within-species heritability and between-species phylogenetic signal should be correlated. Here, we investigate the potential relationship between these two concepts by examining the evolution of multiple morphological traits for which heritability has been estimated in Drosophila melanogaster. Specifically, we analysed 42 morphological traits in both sexes on a phylogeny inferred from 22 nuclear genes for nine species of the melanogaster subgroup. We used Pagel's λ as a measurement of phylogenetic signal because it is the least influenced by the number of analysed taxa. Pigmentation traits showed the strongest concordance with the phylogeny, but no correlation was found between phylogenetic signal and heritability estimates mined from the literature. We obtained data for multiple climatic variables inferred from the geographical distribution of each species. Phylogenetic regression of quantitative traits on climatic variables showed a significantly positive correlation with heritability. Convergent selection, the response to which depends on the trait heritability, may have led to the null association between phylogenetic signal and heritability for morphological traits in Drosophila. We discuss the possible causes of discrepancy between both statistics and caution against their confusion in evolutionary biology.

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The evolution of reproductive isolation in the Drosophila yakuba complex of species

Cited by 34 publications

References 100 publications

A Maladaptive Combination of Traits Contributes to the Maintenance of a Drosophila Hybrid Zone

A Maladaptive Combination of Traits Contributes to the Maintenance of a Drosophila Hybrid Zone

Biogeography and Evolution in the Oceanic Islands of the Gulf of Guinea

Long-term evolution of quantitative traits in the Drosophila melanogaster species subgroup

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