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8 results for “Dynastes hercules”
Data from: Holocene population decline and conservation implication for the Western Hercules Beetle, Dynastes grantii (Coleoptera, Scarabaeidae)
The Western Hercules beetle (Dynastes grantii) is endemic to the highland forest habitats of southwestern USA and northern Mexico. The habitats harbor many endemic species, but are being threatened by rapid climate change and urban development. In this study, the genetic structure of D. grantii populations from southwestern USA was investigated. Specifically, genomic data from double-digest RADseq (ddRADseq) libraries were utilized to test whether geographically distant populations from the Mogollon Rim (Arizona [N = 12 individuals] and New Mexico [N = 10 individuals]) are genetically structured. The study also estimated the effective population size of the Mogollon Rim populations based on genetic diversity. The results indicated that the two geographic populations from the Mogollon Rim were not genetically structured. A population size reduction was detected since the end of the last glacial period, which coincided with a reduction of forest habitat in the study area. The results implied that the connectivity and the size of highland forest habitats in the Mogollon Rim could have been the major factors shaping the population genetic structure and demographic history of D. grantii. The Western Hercules beetle could be a useful flagship species for local natural history education and to promote the conservation of highland forest habitats.
Data from: Holocene population decline and conservation implication for the Western Hercules Beetle, Dynastes grantii (Coleoptera, Scarabaeidae)
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Chromosome-level genome assembly of Dynastes reidi reveals structural evolution of autosomes and the sex chromosomes in Hercules Beetles
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Data from: The Hercules beetles (subgenus Dynastes, genus Dynastes, Dynastidae): a revisionary study based on the integration of molecular, morphological, ecological, and geographic analyses
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Data from: What have been and what can be delimited as species using molecular data under the multi-species coalescent model? A case study using Hercules beetles (Dynastes; Dynastidae)
Molecular species delimitation using the multi-species coalescent model has become common for statistically and objectively determining species limits. Empirical examples of how consistently different molecular data sets delimit the same level of divergence as species using coalescent-based methods are still lacking. I applied the method of molecular species delimitation in the Bayesian Phylogenetics and Phylogeography (BPP) program to study species delimitation in the divergence between populations and between putative species across four species of Hercules beetles. The quantity and variability of the molecular data affected species delimitation. A divergence that represented a late stage along the speciation continuum, e.g. between sympatric biological species, could be delimited by BPP by fewer and less variable loci than a recent divergence, e.g. between geographic populations. My results further indicated that the use of genomic data could even over-split geographically continuously distributed populations into species. I compared my results with those from other empirical studies and argue for the need of a thorough review of the kind of evolutionary entities, e.g. geographic populations versus morphologically distinct taxa, that have been designated as species and whether such designations are consistent among studies.
Data from: Parapatric genetic introgression and phenotypic assimilation: testing conditions for introgression between Hercules beetles (Dynastes, Dynastinae)
The prevalence and consequences of genetic introgression between species have been intensively debated. I used Hercules beetles as examples to test for conditions that may be associated with the occurrence of introgression. RADseq data were used to reconstruct the species tree and history of introgression between Hercules beetles. Image data from museum specimens were used to investigate the phenotypic similarity of two adaptive traits between species from two distinct climatic realms (Nearctic vs. Neotropical). Genetic introgression was identified between Hercules beetles living in geographic proximity (parapatric). Phylogenetic relatedness and phenotypic similarity did not predict nor preclude genetic introgression between species. Phenotypic assimilation in body coloration was evident between distantly related Hercules beetles codistributed in Central America, where directional introgression was also statistically supported from the putative donor to receiver lineages. The number of introgressed loci was significantly higher between species with than without phenotypic similarity. I discuss the implications of recent studies on adaptive genetic introgression by providing supporting evidence from the Hercules beetle system.
Data from: Parapatric genetic introgression and phenotypic assimilation: testing conditions for introgression between Hercules beetles (Dynastes, Dynastinae)
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Data from: What have been and what can be delimited as species using molecular data under the multi-species coalescent model? A case study using Hercules beetles (Dynastes; Dynastidae)
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