Revision and Biogeography of theMelanoplus scudderiSpecies group (Orthoptera: Acrididae: Melanoplinae) with a Description of 21 New Species and Establishment of theCarnegieiandDavisiSpecies Groups

Hill, JoVonn G.

doi:10.3157/061.141.0101

Cited by 5 publications

(21 citation statements)

References 33 publications

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“…Genomic data were collected from 96 individuals, with three to five representatives per putative species sequenced for each of 20 putative species from the M. scudderi species complex (collection and voucher information are in Table S1); only males were sequenced so that individuals could be assigned to putative taxa based on the diagnostic genitalic characters (see Hill, 2015). Specifically, we applied a reduced-representation library to contend with large genomes of Melanoplus grasshoppers (c. 4 GB).…”

Section: Species Sampling and Genomic Datamentioning

confidence: 99%

“…Outlines of the lateral and dorsal view of the male genitalia, specifically the shape of the apical valves of the aedeagus, were collected from digital images of specimens (data available as supplementary data in Dryad; see also Hill, 2015); for details regarding outline data collection see the protocol detailed in Márquez & Knowles (2007). We analysed one individual per species, a standard approach applied in similar comparative phenotypic and phylogenetic studies on grasshoppers and crickets (e.g.…”

Section: Morphological Analyses Of Male Genitaliamentioning

confidence: 99%

“…1). There are more than 20 recognized putative species in the M. scudderi species complex according to a recent revision (Hill, 2015). The complex is geographically widespread.…”

Section: Introductionmentioning

confidence: 99%

“…The study of the systematics of the M. scudderi species complex is also more generally representative of the challenges that arise when the biology of the group seems incongruent with the taxon's traits. For example, before the recent thorough revision (Hill, 2015), only one morphological species was described. Such a systematic proposal is suspect on several fronts.…”

Section: Introductionmentioning

confidence: 99%

“…wing patterns and body coloration). In fact, when internal characters, and specifically the male genitalia, were examined (Hill, 2015), a diversity of potential taxa were revealed. As such, the 'cryptic' species diversity in the M. scudderi species complex, as with other studies, has a direct impact on biodiversity estimates, with downstream implications for ecological and evolutionary studies (Bickford et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Paraphyletic species no more – genomic data resolve a Pleistocene radiation and validate morphological species of the Melanoplus scudderi complex (Insecta: Orthoptera)

Huang

Hill

Ortego

et al. 2020

Systematic Entomology

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Rapid speciation events, with taxa generated over a short time period, are among the most investigated biological phenomena. However, molecular systematics often reveals contradictory results compared with morphological/phenotypical diagnoses of species under scenarios of recent and rapid diversification. In this study, we used molecular data from an average of over 29 000 loci per sample from RADseq to reconstruct the diversification history and delimit the species boundary in a short-winged grasshopper species complex (Melanoplus scudderi group), where Pleistocene diversification has been hypothesized to generate more than 20 putative species with distinct male genitalic shapes. We found that, based on a maximum likelihood molecular phylogeny, each morphological species indeed forms a monophyletic group, contrary to the result from a previous mitochondrial DNA sequence study. By dating the diversification events, the species complex is estimated to have diversified during the Late Pleistocene, supporting the recent radiation hypothesis. Furthermore, coalescent-based species delimitation analyses provide quantitative support for independent genetic lineages, which corresponds to the morphologically defined species. Our results also showed that male genitalic shape may not be predicted by evolutionary distance among species, not only indicating that this trait is labile, but also implying that selection may play a role in character divergence. Additionally, our findings suggest that the rapid speciation events in this flightless grasshopper complex might be primarily associated with the fragmentation of their grassland habitats during the Late Pleistocene. Collectively, our study highlights the importance of integrating multiple sources of information to delineate species, especially for a species complex that diversified rapidly, and whose divergence may be linked to ecological processes that create geographic isolation (i.e. fragmented habitats), as well as selection acting on characters with direct consequences for reproductive isolation (i.e. genitalic divergence).

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Section: Species Sampling and Genomic Datamentioning

confidence: 99%

Section: Morphological Analyses Of Male Genitaliamentioning

confidence: 99%

“…1). There are more than 20 recognized putative species in the M. scudderi species complex according to a recent revision (Hill, 2015). The complex is geographically widespread.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Paraphyletic species no more – genomic data resolve a Pleistocene radiation and validate morphological species of the Melanoplus scudderi complex (Insecta: Orthoptera)

Huang

Hill

Ortego

et al. 2020

Systematic Entomology

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Revisiting the comparative phylogeography of unglaciated eastern North America: 15 years of patterns and progress

Lyman

Edwards

2022

Ecology and Evolution

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In a landmark comparative phylogeographic study, "Comparative phylogeography of unglaciated eastern North America," Soltis et al. (Molecular Ecology, 2006, 15, 4261) identified geographic discontinuities in genetic variation shared across taxa occupying unglaciated eastern North America and proposed several common biogeographical discontinuities related to past climate fluctuations and geographic barriers. Since 2006, researchers have published many phylogeographical studies and achieved many advances in genotyping and analytical techniques; however, it is unknown how

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Genomic footprints of an old affair: Single nucleotide polymorphism data reveal historical hybridization and the subsequent evolution of reproductive barriers in two recently diverged grasshoppers with partly overlapping distributions

2020

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Secondary contact in close relatives can result in hybridization and the admixture of previously isolated gene pools. However, after an initial period of hybridization, reproductive isolation can evolve through different processes and lead to the interruption of gene flow and the completion of the speciation process. Omocestus minutissimus and O. uhagonii are two closely related grasshoppers with partially overlapping distributions in the Central System mountains of the Iberian Peninsula. To analyse spatial patterns of historical and/or contemporary hybridization between these two taxa and understand how species boundaries are maintained in the region of secondary contact, we sampled sympatric and allopatric populations of the two species and obtained genome-wide SNP data using a restriction site-associated DNA sequencing approach. We used Bayesian clustering analyses to test the hypothesis of contemporary hybridization in sympatric populations and employed a suite of phylogenomic approaches and a coalescent-based simulation framework to evaluate alternative hypothetical scenarios of interspecific gene flow. Our analyses rejected the hypothesis of contemporary hybridization but revealed past introgression in the area where the distributions of the two species overlap. Overall, these results point to a scenario of historical gene flow after secondary contact followed by the evolution of reproductive isolation that currently prevents hybridization among sympatric populations.

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Revision and Biogeography of theMelanoplus scudderiSpecies group (Orthoptera: Acrididae: Melanoplinae) with a Description of 21 New Species and Establishment of theCarnegieiandDavisiSpecies Groups

Cited by 5 publications

References 33 publications

Paraphyletic species no more – genomic data resolve a Pleistocene radiation and validate morphological species of the Melanoplus scudderi complex (Insecta: Orthoptera)

Paraphyletic species no more – genomic data resolve a Pleistocene radiation and validate morphological species of the Melanoplus scudderi complex (Insecta: Orthoptera)

Revisiting the comparative phylogeography of unglaciated eastern North America: 15 years of patterns and progress

Genomic footprints of an old affair: Single nucleotide polymorphism data reveal historical hybridization and the subsequent evolution of reproductive barriers in two recently diverged grasshoppers with partly overlapping distributions

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