Phylogenomic discordance is driven by wide-spread introgression and incomplete lineage sorting during rapid species diversification within rattlesnakes (Viperidae: Crotalus and Sistrurus)

Systematic Biology, Journal Year: 2024, Volume and Issue: 73(4), P. 722 - 741

Published: May 2, 2024

-Phylogenomics allows us to uncover the historical signal of evolutionary processes through time and estimate phylogenetic networks accounting for these signals. Insight from genome-wide data further pinpoint contributions hybridization, introgression, ancestral polymorphism across genome. Here, we focus on how have contributed discordance among rattlesnakes (genera Crotalus Sistrurus), a group which there are numerous conflicting hypotheses based diverse array molecular datasets analytical methods. We address instability rattlesnake phylogeny using genomic generated transcriptomes sampled nearly all known species. These data, analyzed with coalescent network-based approaches, reveal instances rapid speciation where individual gene trees conflict species tree. Moreover, history is dominated by incomplete frequent both likely influenced past interpretations phylogeny. present new framework in relationships this can only be understood light Our suggest that network radiations, like those seen within rattlesnakes, phylogenomic context, necessitating similar approaches our attempts understand other rapidly radiating

Language: Английский

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Taxonomic investigation of the zooplanktivorous Lake Malawi cichlids Copadichromis mloto (Iles) and C. virginalis (Iles)

Hydrobiologia, Journal Year: 2022, Volume and Issue: 850(10-11), P. 2165 - 2175

Published: Oct. 27, 2022

The taxonomic status of the zooplanktivorous cichlids Copadichromis mloto and C. virginalis has been confused since their original descriptions by lles in 1960. Whilst two forms virginalis, 'Kaduna' 'Kajose', were distinguished type material, not positively identified its description. Here we re-examined types as well 54 recently collected specimens from multiple sampling locations. Genome sequencing 51 recent revealed closely related but reciprocally monophyletic clades. Geometric morphological analysis indicated that one clade morphologically encompasses Iles Kaduna form, including holotype, whilst other only paratypes Kajose also series mloto. Given all three Iles's are same locality, there no meristic or character states to differentiate them records adult male breeding colours, conclude form previously represents relatively deeper bodied sexually active maturing individuals mloto.The online version contains supplementary material available at 10.1007/s10750-022-05025-1.

Language: Английский

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Whole Genome Data Confirm Pervasive Gene Discordance in the Evolutionary History of Coenonympha (Nymphalidae) Butterflies

Published: Jan. 1, 2024

Phylogenetic inference is challenged by genealogical heterogeneity amongst genetic markers. Such discordance driven predominantly incomplete lineage sorting (ILS) and interspecific gene flow, bears attendant consequences for the accurate resolution of species relationships. Understanding distribution conflict in organismal genomes is, therefore, a key aspect phylogenetic analysis. In this study, three large phylogenomic datasets (i.e., whole mitogenomes, conserved nuclear protein-coding loci, genomic windows) are used to probe extent which pervades unresolved phylogeny Coenonympha (Nymphalidae) butterflies. Discordance found be elevated at multiple historically recalcitrant positions. particular, relationships near crown within rapidly diversifying subclade (the hero group) remain difficult resolve, suggesting that ILS flow have obscured evolution genus. These findings implications taxonomy butterfly group study its diversification history. addition, work lends support growing body evidence biological processes stands confound phylogeny, even when extensive data used.

Language: Английский

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Gondwanan relic or recent arrival? The biogeographic origins and systematics of Australian tarantulas

Molecular Phylogenetics and Evolution, Journal Year: 2024, Volume and Issue: unknown, P. 108246 - 108246

Published: Nov. 1, 2024

The composition of Australia's fauna and flora has been largely assembled by two biogeographic processes, vicariance long-distance dispersal establishment. These patterns can be observed today through the survival Gondwanan lineages contrasted with relatively recent colonization from south-east Asia, respectively. In general, post-Gondwanan immigrant Asia are taxa traits that facilitate dispersal. Consequently, like tarantulas (Araneae, Theraphosidae) pan-tropical but also have a low propensity for dispersal, thought to in origin. However, Australian unsampled phylogenomic studies and, as such, their classification origins long debated unresolved. Here we test if current, morphology-based Selenocosmiinae is accurate assess whether were present Australia while it was part Gondwana. We sample 369 tarantula specimens across Australia, greatly expanding geographic sampling previous studies, develop first continent-wide phylogeny tarantulas. To resolve 'back bone' generate 20 new transcriptomes species representing distinct uncovered using mitochondrial sequence data combine these published transcriptomic data. Through recovery ultra-conserved element (UCE) loci testing multiple occupancy matrices, find clade monophyletic nested inside Asian Selenocosmiinae. young radiation crown age 8.3-18.8 Ma therefore reject hypothesis origin animals instead, infer Asia. Our findings indicate they underwent rapid radiation, possibly coinciding arrival into Australia. refute monophyly Selenocosmia Coremiocnemis currently recognised, remove stalkeri synonymy stirlingi.

Language: Английский

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Population genomic analysis reveals cryptic population structure in the commercially important Lake Malawi cichlid Copadichromis mloto (IIes, 1960)

Hydrobiologia, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

Language: Английский

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