TRANSITIONAL POPULATIONS OF<i>DROSOPHILA PAULISTORUM</i>

Dobzhausky, Theodosius; Pavlovsky, Olga

doi:10.1111/j.1558-5646.1969.tb03530.x

Cited by 15 publications

(9 citation statements)

References 15 publications

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“…For an understanding of the evolutionary relationships of the D. paulistorum semispecies, it may be of interest to relate the present findings to previous work on sexual isolation between the semispecies. There is a certain concordance of the present observations with other analyses of sexual isolation and some of the data on the geographic distribution of the different forms (Carmody et al, 1962;Dobzhansky et al, 1964;Dobzhansky and Pavlovsky, 1967;Dobzhansky et al, 1969;Petit and Ehrman, 1969;Perez-Salas et al, 1970;Spassky et al, 1971;Perez-Salas and Ehrman, 1971). Thus, although in their general courtship pattern, strains from the geographically most remote semispecies (Centroamerican and Andean-Brazilian) are the most different (Koref-Santibaiiez, 1972), those of the sympatric forms (Amazonian, Orinocan and Andean-Brazilian), are the ones that show the greatest sexual and courtship discrimination in the observations presented here.…”

Section: Discussionsupporting

confidence: 90%

COURTSHIP INTERACTION IN THE SEMISPECIES OFDROSOPHILA PAULISTORUM

Koref-Santibanez

1972

Evolution

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Section: Discussionsupporting

confidence: 90%

COURTSHIP INTERACTION IN THE SEMISPECIES OFDROSOPHILA PAULISTORUM

Koref-Santibanez

1972

Evolution

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“…Dobzhansky named ''species in statu nascendi'' (Dobzhansky & Spassky, 1959). Most pairwise combinations of these races produce sterile male hybrids, but several races produce fertile male offspring in crosses with at least some other races (Dobzhansky et al, 1964(Dobzhansky et al, , 1969Dobzhansky & Pavlovsky, 1967). Male sterility in this case appears to be caused by an interaction between the racial genomes and racespecific endosymbionts (Ehrman & Kernaghan, 1971;Perez-Salas & Ehrman, 1971).…”

Section: Discussionmentioning

confidence: 89%

Speciation in Progress? A Continuum of Reproductive Isolation in Drosophila Bipectinata

Kopp

Frank

2005

Genetica

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Incipient species in the early stages of divergence can provide crucial information about the genetic basis of reproductive isolation and the evolutionary forces that promote speciation. In this report, we describe two subspecies of Drosophila bipectinata that show a continuum of reproductive isolation. Crosses between strains of the same subspecies produce fully fertile offspring. At the same time, each subspecies harbors extensive variation for the degree of reproductive isolation from the other subspecies. The percentage of fertile hybrid males varies from 0 to 90%, depending on the origin of parental strains, indicating that the genes responsible for hybrid sterility are not fixed within either subspecies, or even within local populations. Reproductive isolation is non-transitive, so that the extent of hybrid sterility depends on the particular combination of strains. The two subspecies show little or no evidence of genetic differentiation at three nuclear loci, suggesting that they diverged very recently or continue to experience significant levels of gene flow. A hybrid zone between the two subspecies may exist in New Guinea and Northeastern Australia.

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“…This is due to the presence of high levels of ethological isolation, but when the cross occurs, unviable hybrids or sterile males and fertile females are produced (Ehrman and Powell 1982). Exceptions to this rule are provided by the crosses involving the Transitional semispecies and the AndeanBrazilian or the Centroamerica ones, which produce viable and fertile offspring in some cases (Dobzhansky et al 1969). Thus, Dobzhansky et al (1964) argue that these semispecies could be considered ''about equally legitimately'' as distinct races or as closely related species.…”

Section: Introductionmentioning

confidence: 94%

Taxonomic boundaries, phylogenetic relationships and biogeography of the Drosophila willistoni subgroup (Diptera: Drosophilidae)

et al. 2010

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The Drosophila willistoni subgroup represents a complex with varying taxonomic levels. It encompasses D. willistoni and its five sibling species: D. equinoxialis, D. insularis, D. paulistorum, D. pavlovskiana and D. tropicalis. Of these, D. equinoxialis, D. tropicalis and D. willistoni present differentiation at subspecific level, whereas D. paulistorum represents a superspecies, formed by six semispecies. Despite this taxonomic and evolutionary complexity, many of these semi and subspecific taxa have not yet had their phylogenetic status tested in an explicitly molecular study. Aiming to contribute to the understanding of the evolution of this challenging group, we analyzed nucleotide sequences from two mitochondrial and four nuclear datasets, both individually and simultaneously, through different phylogenetic methods. High levels of incongruence were detected among partitions, especially concerning the mitochondrial sequences. As this incongruence was found to be statistically significant and robust to the use of different models and approaches, and basically restricted to mitochondrial loci, we suggest that it may stem mainly from hybridization-mediated asymmetrical introgression. Despite this, our nuclear data finally led to a phylogenetic hypothesis which further refines several aspects related to the willistoni subgroup phylogeny. In this respect, D. insularis, D. tropicalis, D. willistoni and D. equinoxialis successively branched off from the willistoni subgroup main stem, which recently subdivided to produce D. paulistorum and D. pavlovskiana. As regards the semispecies evolution, we found evidence of a recent diversification, which highly influenced the obtained results due to the associated small levels of genetic differentiation, further worsened by the possibly associated incompletely sorted ancestral polymorphisms and by the possibility of introgression. This study also raises the question of whether these semispecies are monophyletic at all. This reasoning is particularly interesting when one considers that similar levels of reproductive isolation could be attained through infection with different Wolbachia strains.

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TRANSITIONAL POPULATIONS OFDROSOPHILA PAULISTORUM

Cited by 15 publications

References 15 publications

COURTSHIP INTERACTION IN THE SEMISPECIES OFDROSOPHILA PAULISTORUM

COURTSHIP INTERACTION IN THE SEMISPECIES OFDROSOPHILA PAULISTORUM

Speciation in Progress? A Continuum of Reproductive Isolation in Drosophila Bipectinata

Taxonomic boundaries, phylogenetic relationships and biogeography of the Drosophila willistoni subgroup (Diptera: Drosophilidae)

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