AI Article Synopsis

  • Phylogenomics helps to analyze the evolutionary history and relationships between species by examining genome-wide data, which reveals signals from processes like hybridization and ancestral genetic variation.
  • The study focuses on rattlesnakes (Crotalus and Sistrurus), highlighting the inconsistencies in their phylogenetic history due to conflicting molecular data and methods.
  • Findings show that the rattlesnake evolutionary history involves rapid speciation and frequent hybridization, suggesting that a broader, genome-wide perspective is essential for accurately interpreting the evolutionary relationships of species with complex histories.

Article Abstract

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

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http://dx.doi.org/10.1093/sysbio/syae018DOI Listing

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