Genetic and phenotypic differentiation suggests incipient speciation within Drosophila arizonae (Diptera: Drosophilidae)

Rampasso, Augusto Santos; Markow, Therese A.; Richmond, Maxi Polihronakis

doi:10.1093/biolinnean/blx073

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…These younger estimates suggest that the speciation of this entire clade revolves around the cyclic climatic fluctuations of the past few million years and the accompanying shifts in host cactus distribution. On the contrary, major geological events such as the raising of the Trans-Mexican Volcanic Belt, that have been previously hypothesized as possible causes of intra-and interspecific divergence (Machado et al 2007;Rampasso et al 2017), appear to be too ancient to have played a role here.…”

Section: Discussionmentioning

confidence: 70%

Chromosome-length genome assemblies of cactophilicDrosophilailluminate links between structural and sequence evolution

Benowitz

Allan

Jaworski

et al. 2022

Preprint

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A thorough understanding of adaptation and speciation requires model organisms with both a history of ecological and phenotypic study as well as a robust set of genomic resources. For decades, the cactophilic Drosophila species of the southwestern US and northern Mexico have fit this profile, serving as a crucial model system for understanding ecological adaptation, particularly in xeric environments, as well as the evolution of reproductive incompatibilities and speciation. Here, we take a major step towards gaining a complete molecular description of this system by assembling and annotating seven chromosome-length de novo genomes across the three species D. mojavensis, D. arizonae, and D. navojoa. Using this data, we present the most accurate reconstruction of the phylogenetic history of this clade to date. We further demonstrate a relationship between structural evolution and coding evolution both within and between species in this clade, and use this relationship to generate novel hypotheses for adaptation genes. All of our data are presented in a new public database (cactusflybase.arizona.edu), providing one of the most in-depth resources for the analysis of inter- and intraspecific evolutionary genomic data.

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Section: Discussionmentioning

confidence: 70%

Chromosome-length genome assemblies of cactophilicDrosophilailluminate links between structural and sequence evolution

Benowitz

Allan

Jaworski

et al. 2022

Preprint

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Genetic diversity ofCalliphora vicina(Diptera: Calliphoridae) in the Iberian Peninsula based oncox1, 16S and ITS2 sequences

Fuentes-López

Rebelo

Romera

et al. 2020

Biological Journal of the Linnean Society

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The study of Diptera at the scene of a crime can provide essential information for the interpretation of evidence. Phylogeographic reconstruction could help differentiate haplotypes of a dipteran species in a geographical area, clarifying, for example, the details of a possible relocation of a corpse. In addition, inferring the ancestral areas of distribution helps to understand the current status of the species and its biogeographic history. One of the most important species in forensic entomology is Calliphora vicina Rovineau-Desvoidy, 1830 (Diptera: Calliphoridae). The aim of this work is to increase our knowledge of this species in the Iberian Peninsula using 464 specimens from Spain and Portugal. These samples were identified using morphological keys and by molecular methods using fragments of the cox1, 16S and ITS2 genes. The phylogeographic history of these populations was inferred from haplotype networks and the reconstruction of ancestral areas of distribution. The molecular results corroborated the morphological identifications of the samples. Phylogeographic networks showed no geographical structure, as haplotypes are shared among almost all populations. reconstruct ancestral state in phylogenies analyses showed a high rate of movement among populations, possibly related to human activity. These results suggest that this species had a very rapid and recent spatial and demographic expansion throughout the Iberian Peninsula.

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Genetic Diversity and Demographic History in the CactophilicDrosophila repletaSpecies Group (Diptera: Drosophilidae) in North America Inferred from Mitochondrial DNA Barcodes

Pfeiler

2018

Journal of Heredity

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Genetic diversity in mitochondrial DNA barcodes, comprising a segment of the cytochrome c oxidase subunit I (COI) gene, was used to infer demographic histories in selected taxa of the cactophilic Drosophila repleta species group in North America. Haplotype and nucleotide diversities were determined in 16 taxa based on both previously published and new sequences. Haplotype diversity (h) differed dramatically in different taxa, varying from h = 0 in D. eremophila, D. hexastigma and D. bifurca to h = 0.99 in D. hamatofila. Genetic diversity indices and sample sizes were sufficient to infer demographic histories from mismatch distribution analysis and Bayesian skyline plots for nine taxa: D. mojavensis baja, D. m. sonorensis, D. arizonae, D. aldrichi, D. hamatofila, D. spenceri, D. mainlandi, D. mettleri and D. nigrospiracula. Evidence was found for both population expansions and relatively stable populations in these species. Demographic history varied dramatically in subspecies of D. mojavensis, showing a relatively stable population size over time in D. m. sonorensis from the mainland Sonoran Desert whereas a large population expansion was evident in D. m. baja from the Baja California Peninsula, providing support for the hypothesis that the split of sister species D. mojavensis and D. arizonae from a common ancestor occurred on the mainland rather than the peninsula as proposed by others. No evidence was found for a causal relationship between a stable or expanding population and host plant shifts from prickly-pear cactus to columnar cacti, which has occurred independently in many taxa of the repleta group.

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Genetic and phenotypic differentiation suggests incipient speciation within Drosophila arizonae (Diptera: Drosophilidae)

Cited by 3 publications

References 43 publications

Chromosome-length genome assemblies of cactophilicDrosophilailluminate links between structural and sequence evolution

Chromosome-length genome assemblies of cactophilicDrosophilailluminate links between structural and sequence evolution

Genetic diversity ofCalliphora vicina(Diptera: Calliphoridae) in the Iberian Peninsula based oncox1, 16S and ITS2 sequences

Genetic Diversity and Demographic History in the CactophilicDrosophila repletaSpecies Group (Diptera: Drosophilidae) in North America Inferred from Mitochondrial DNA Barcodes

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