Anonymous-paleobio/Biogeographic-Homogenization-DeepTime: doi

All files for reproducibility are found here in this repo for 'Coupling of severe climate change and extinction drive biogeographic homogenization in deep time' by Anonymous: Geologically rapid changes in global biogeography are hypothesized to have environmental and ecological drivers, but their relative contributions and potential interactions remain untested. Using interval-to-interval changes in pairwise biogeographic similarity across the Phanerozoic as a measure of biogeographic change, we assessed whether intervals with high extinction rates, substantial temperature change, or both, were associated with large changes in similarity. The end-Permian and first pulse of the Late Ordovician mass extinctions are the only intervals to result in global taxonomic homogenization that stands out from background conditions. These intervals represent the most taxonomically severe extinctions and rank among the most sustained episodes of global temperature forcing in the Phanerozoic. In contrast, no measurable shift in global compositional similarity was detected in background intervals or in periods where pronounced global temperature forcing and mass extinctions each occurred without the other. Global homogenization appears to require a combination of elevated taxonomic loss and rapid climate change. Please use this url of the repository's website to easily go through the code and follow instructions to download, use the code, or view the code without having to download R or any packages: https://anonymous-paleobio.github.io/Biogeographic-Homogenization-DeepTime/Otherwise, all data and codes are also stored here in Quarto (markdown for R, .qmd/.html) format and can all also be accessed in this repository. All fossil data used is from the Paleobiology Database, with instructions on how to download and process it in 01_pbdb_download_new.R . The Scotese 2021 temperature data and calculations are here also as Scotese_intervalT.csv. The Book in the link above will show you how to do everything step by step in an easy and visually accessible manner. If you did not wish to go through the Book above, then no worries. Each chapter within that book is individually available here, and it is recommended you start in chronological order: 01_pbdb_download_new.R (to download data from the PaleoBiology database) index.html (or index.qmd). Thank you for your interest!