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Understanding Species Boundaries that Arise from Complex Histories: Gene Flow Across the Speciation Continuum in the Spotted Whiptail Lizards.
Syst Biol
November 2024
School of Life Sciences, University of Hawai'i, 3190 Maile Way, Honolulu, HI 96822, USA.
-Gene flow between diverging lineages challenges the resolution of species boundaries and the understanding of evolutionary history in recent radiations. Here, we integrate phylogenetic and coalescent tools to resolve reticulate patterns of diversification and use a perspective focused on evolutionary mechanisms to distinguish interspecific and intraspecific taxonomic variation. We use this approach to resolve the systematics for one of the most intensively studied but difficult to understand groups of reptiles: the spotted whiptail lizards of the genus Aspidoscelis (A.
View Article and Find Full Text PDFComplex patterns of gene flow and convergence in the evolutionary history of the spiral-horned antelopes (Tragelaphini).
Mol Phylogenet Evol
September 2024
Department of Biological Sciences, University of Venda, Private Bag X5050, Thohoyandou 0950, Republic of South Africa. Electronic address:
The Tragelaphini, also known as spiral-horned antelope, is a phenotypically diverse mammalian tribe comprising a single genus, Tragelaphus. The evolutionary history of this tribe has attracted the attention of taxonomists and molecular geneticists for decades because its diversity is characterised by conflicts between morphological and molecular data as well as between mitochondrial, nuclear and chromosomal DNA. These inconsistencies point to a complex history of ecological diversification, coupled by either phenotypic convergence or introgression.
View Article and Find Full Text PDFAngiosperm flowers reached their highest morphological diversity early in their evolutionary history.
New Phytol
February 2024
Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, Vienna, A-1030, Austria.
Flowers are the complex and highly diverse reproductive structures of angiosperms. Because of their role in sexual reproduction, the evolution of flowers is tightly linked to angiosperm speciation and diversification. Accordingly, the quantification of floral morphological diversity (disparity) among angiosperm subgroups and through time may give important insights into the evolutionary history of angiosperms as a whole.
View Article and Find Full Text PDFThere is a contemporary trend in many major research institutions to de-emphasize the importance of natural history education in favor of theoretical, laboratory, or simulation-based research programs. This may take the form of removing biodiversity and field courses from the curriculum and the sometimes subtle maligning of natural history research as a "lesser" branch of science. Additional threats include massive funding cuts to natural history museums and the maintenance of their collections, the extirpation of taxonomists across disciplines, and a critical under-appreciation of the role that natural history data (and other forms of observational data, including Indigenous knowledge) play in the scientific process.
View Article and Find Full Text PDFToward transparent taxonomy: an interactive web-tool for evaluating competing taxonomic arrangements.
Cladistics
April 2024
Department of Entomology, University of Kentucky, S225 Ag Science Center North, Lexington, KY, 40546, USA.
Informative and consistent taxonomy above the species level is essential to communication about evolution, biodiversity and conservation, and yet the practice of taxonomy is considered opaque and subjective by non-taxonomist scientists and the public alike. While various proposals have tried to make the basis for the ranking and inclusiveness of taxa more transparent and objective, widespread adoption of these ideas has lagged. Here, we present TaxonomR, an interactive online decision-support tool to evaluate alternative taxonomic classifications.
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