REPRODUCTIVE ISOLATION IN SONORAN DESERT
            <i>DROSOPHILA</i>

Markow, Therese A.; Fogleman, James C.; Heed, William B.

doi:10.1111/j.1558-5646.1983.tb05585.x

Cited by 49 publications

(54 citation statements)

References 16 publications

(9 reference statements)

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“…Asymmetrical accumulation of reproductive barriers is thought to be a common first stage of reproductive isolation. When two males differ in sexual vigor, asymmetries in assortative mating may occur where the more vigorous male is the less discriminating species (Markow and Hocutt 1998). The greater association of F 1 nuclear genotypes with (o) mitochondrial haplotypes was consistent with behavioral observations showing that P. sonoriensis males were more vigorous and less discriminating than P. occidentalis males.…”

Section: Discussionsupporting

confidence: 75%

Premating, Not Postmating, Barriers Drive Genetic Dynamics in Experimental Hybrid Populations of the Endangered Sonoran Topminnow

2005

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The timing and pattern of reproductive barrier formation in allopatric populations has received much less attention than the accumulation of reproductive barriers in sympatry. The theory of allopatric speciation suggests that reproductive barriers evolve simply as by-products of overall genetic divergence. However, observations of enhanced premating barriers in allopatric populations suggest that sexual selection driven by intraspecific competition for mates may enhance species-specific signals and accelerate the speciation process. In a previous series of laboratory trials, we examined the strength of premating and postmating barriers in an allopatric species pair of the endangered Sonoran topminnow, Poeciliopsis occidentalis and P. sonoriensis. Behavioral observations provided evidence of asymmetrical assortative mating, while reduced brood sizes and male-biased F 1 sex ratios suggest postmating incompatibilities. Here we examine the combined effects of premating and postmating barriers on the genetic makeup of mixed populations, using cytonuclear genotype frequencies of first-and second-generation offspring. Observed genotype frequencies strongly reflect the directional assortative mating observed in behavioral trials, illustrating how isolating barriers that act earlier in the reproductive cycle will have a greater effect on total reproductive isolation and may be more important to speciation than subsequent postmating reproductive barriers.

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Section: Discussionsupporting

confidence: 75%

Premating, Not Postmating, Barriers Drive Genetic Dynamics in Experimental Hybrid Populations of the Endangered Sonoran Topminnow

2005

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“…As for the evolution of these flies, it has been suggested that the asymmetrical intraspecific isolation between (B) and (S) arose as a by-product of selection for reinforcement of interspecific isolation between D. mojavensis (S) and D. arizonensis, which occurred on the Mexican mainland after an invasion of Sonora by D. mojavensis from Baja California (Zouros and d'Entremont, 1974;Wasserman andKoepfer, 1977, 1980;Markow et al, 1983). Zouros and d'Entremont (1980) suggested that the range of behavior of the migrant peninsular males overlapped that of the Sonoran D. arizonensis males.…”

Section: Discussionmentioning

confidence: 99%

SELECTION FOR SEXUAL ISOLATION BETWEEN GEOGRAPHIC FORMS OF DROSOPHILA MOJAVENSIS . I. INTERACTIONS BETWEEN THE SELECTED FORMS

Koepfer

1987

Evolution

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Abstract. -Drosophila mojavensis comprises three geographic forms occurring in the United States, the Baja California peninsula, and mainland Mexico. Peninsular and mainland forms were selected for increased sexual isolation from each other, while controls were maintained with maximum outbreeding. Response to selection was highly asymmetrical in that isolation was very high between selected peninsular males and mainland females, but nonexistent between selected mainland males and peninsular females. The heightened isolation is primarily due to some change in the peninsular males.

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“…The four geographic host races show genetic differentiation from one another (Reed and Markow 2004;Ross and Markow 2006;Machado et al 2007a) along with varying levels of reproductive isolation among themselves and with their sibling species, D. arizonae (Vigneault and Zouros 1986;Markow 1991;Reed and Markow 2004). These features of D. mojavensis have made it a popular and useful model species for studies of adaptation (Matzkin et al 2006) and speciation (Markow and Hocutt 1998).…”

Section: Mojavensis Mapsmentioning

confidence: 99%

Polytene Chromosomal Maps of 11 Drosophila Species: The Order of Genomic Scaffolds Inferred From Genetic and Physical Maps

et al. 2008

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The sequencing of the 12 genomes of members of the genus Drosophila was taken as an opportunity to reevaluate the genetic and physical maps for 11 of the species, in part to aid in the mapping of assembled scaffolds. Here, we present an overview of the importance of cytogenetic maps to Drosophila biology and to the concepts of chromosomal evolution. Physical and genetic markers were used to anchor the genome assembly scaffolds to the polytene chromosomal maps for each species. In addition, a computational approach was used to anchor smaller scaffolds on the basis of the analysis of syntenic blocks. We present the chromosomal map data from each of the 11 sequenced non-Drosophila melanogaster species as a series of sections. Each section reviews the history of the polytene chromosome maps for each species, presents the new polytene chromosome maps, and anchors the genomic scaffolds to the cytological maps using genetic and physical markers. The mapping data agree with Muller's idea that the majority of Drosophila genes are syntenic. Despite the conservation of genes within homologous chromosome arms across species, the karyotypes of these species have changed through the fusion of chromosomal arms followed by subsequent rearrangement events. O NE of the primary strengths of the genus Drosophila as a model system has been the relative ease of generating detailed cytogenetic maps. Indeed, the first definitive mapping of genes to chromosomes Genetics 179: 1601-1655 ( July 2008) was performed in Drosophila melanogaster (Bridges 1916). The subsequent discovery of polytene chromosomes in the salivary glands in this same species (Painter 1934) and their codification into fine-structure genetic/ cytogenetic maps represents perhaps one of the first forays into ''genomics.'' Polytene maps (Bridges 1935;Lefevre 1976) provided an important genetic tool for mapping genes, for detecting genetic diversity within populations, and for inferring phylogenies among related species (Dobzhansky and Sturtevant 1938;Judd et al. 1972;Ashburner and Lemeunier 1976;Lemeunier and Ashburner 1976). Sturtevant and Tan (1937) laid the groundwork for comparative genomics when they established that genes within the chromosomal arms are conserved or syntenic among species. In an insightful melding of the gene mapping and evolutionary studies, H. J. Muller (1940) proposed that the genomes of Drosophila species were subdivided into a set of homologous elements represented by chromosome arms. What Muller (1940) noted, which was subsequently elaborated on by Sturtevant and Novitski (1941), was that the presumed homologs of identified mutant alleles within a chromosome arm of D. melanogaster were also confined to a single arm in other species within the genus where mapping data were available. Using D. melanogaster as a reference, Muller proposed that each of the five major chromosome arms plus the dot chromosome be given a letter designation (A-F) and that this nomenclature be used to identify equivalent linkage groups within the genus.The an...

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REPRODUCTIVE ISOLATION IN SONORAN DESERT DROSOPHILA

Cited by 49 publications

References 16 publications

Premating, Not Postmating, Barriers Drive Genetic Dynamics in Experimental Hybrid Populations of the Endangered Sonoran Topminnow

Premating, Not Postmating, Barriers Drive Genetic Dynamics in Experimental Hybrid Populations of the Endangered Sonoran Topminnow

SELECTION FOR SEXUAL ISOLATION BETWEEN GEOGRAPHIC FORMS OF DROSOPHILA MOJAVENSIS . I. INTERACTIONS BETWEEN THE SELECTED FORMS

Polytene Chromosomal Maps of 11 Drosophila Species: The Order of Genomic Scaffolds Inferred From Genetic and Physical Maps

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