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THE ORIGINS OF BIODIVERSITY

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What factors promote the generation of biodiversity? Our lab combines data on the genomes and phenotypes of diverse vertebrate lineages with robust phylogenetic inference to answer this question. Among other findings, we have demonstrated that an inverse global latitudinal gradient is etched into the speciation rates of living marine fishes, shown that the most recent mass extinction, the Cretaceous-Paleogene event, left a major imprint on the diversification of living actinopterygian diversity, and charted how climate change and ecological turnover have promoted phenotypic innovation and habitat change in species-rich lineages of ray-finned fishes.

Our lab contributed to the inference of the largest-ever phylogeny of ray-finned fishes. Using distribution data, we helped demonstrate that there is an inverse latitudinal gradient in rates of speciation in marine ray-finned fish clades. From: https://www.nature.com/articles/s41586-018-0273-1
Analysis of morphological variation and tempo of disparification in acanthomorph fishes, showing a prolonged expansion after the Cretaceous-Paleogene mass extinction. From: https://doi.org/10.1038/s41559-022-01801-3
Our lab is particularly interested in the patterns of climate and oceanic change that drove the radiation of Antarctic notothenioids that include the iconic white-blooded icefishes. Plots show disparity-through-time for ecologically relevant traits in icefishes and notoperches. From: https://www.journals.uchicago.edu/doi/full/10.1086/721373
What role does ancient hybridization (introgression) play in animal radiations? We have used ddRAD-based phylogenies of darters to answer this question. Figure from: https://doi.org/10.1093/sysbio/syy074
Striking associations between major biogeographic patterns in notothenioids and climate change in and around Antarctica. From: https://www.nature.com/articles/s41559-017-0239-y/figures/3
Trait-based diversification rates help illuminate the synergistic interactions of novel reproductive traits and ecomorphologies in the radiation of anglerfishes in the midnight zone of the deep ocean. From: https://doi.org/10.1101/2024.01.12.575380
Tip-dated molecular phylogeny of lungfishes (Dipnoi). Boxes at nodes indicate inferred ancestral ranges, and continent silhouettes and shaded regions indicate timing of major Gondwanan fragmentation events (yellow shaded region indicates the isolation of eastern Gondwana, including southeastern Asia, and the orange shaded region indicates the separation of Africa and South America). From https://onlinelibrary.wiley.com/doi/full/10.1111/jbi.14609
Ages of the oldest hybridizing divergence in selected vertebrate lineages plotted against the mean exon rates estimated for their respective crown clades, showing a pattern of exponential decay consistent with the tempo of hybrid incompatibility. From https://academic.oup.com/evolut/advance-article/doi/10.1093/evolut/qpae028/7615529
Photographs kindly provided by Julia Wood and Zach Alley. Anglerfish illustrations by Julie Johnson.
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  • Home
  • Publications and Curriculum Vitae
  • Meet The Lab
  • Contact
  • Research: Speciation
  • Research: Phylogenetics
  • Research: Origins of Biodiversity
  • News and Updates
  • Join the lab