DOI: 10.5061/dryad.r20d2s4
title: Data from: Marine invertebrate migrations trace climate change over 450 million years

description: Aim: Poleward migration is a clear response of marine organisms to current
 global warming but the generality and geographical uniformity of this
 response are unclear. Marine fossils are expected to record the range
 shift responses of taxa and ecosystems to past climate change. However,
 unequal sampling (natural and human) in time and space biases the fossil
 record, restricting previous studies of ancient migrations to individual
 taxa and events. We expect that temporal changes in the latitudinal
 distribution of surviving taxa will reveal range shifts to trace global
 climate change. Location: Global. Time period: Post-Cambrian Phanerozoic
 aeon. Major taxa studied: Well-fossilised marine benthic invertebrates
 comprising stony corals, bivalves, gastropods, brachiopods, trilobites and
 calcifying sponges. Methods: We track deviations in the latitudinal
 distribution of range centres of age-to-age surviving taxa from the
 expected distribution, and compare responses across latitudes. We build
 deviation time series, spanning hundreds of million years, from fossil
 occurrences and test correlations with seawater temperature estimates
 derived from stable oxygen isotopes of fossils. Results: Seawater
 temperature and latitudinal deviations from sampling are positively
 correlated over the Post-Cambrian Phanerozoic. Simulations suggest that
 sampling patterns are highly unlikely to drive this putative signal of
 range shifts. Systematically accounting for known sampling issues
 strengthens this correlation, so that climate is capable of explaining
 nearly a third of the variance in ancient latitudinal range shifts. The
 relationship is stronger in low latitude taxa than higher latitude taxa,
 and in warm ages than cool ages. Main conclusions: Latitudinal range
 shifts occurred in concert with climate change throughout the
 post-Cambrian Phanerozoic. Low latitude taxa show the clearest
 climate-migration signal through time, corroborating predictions of their
 shift in a warming future.
description: Raw data from
 Paleobiology Database These are the raw data
 prior to any cleaning to be used with LatDevRcodeUpdated.R,
 Palaeo222cells.csv, stages_2012PBDB.csv and
 TimeSeriesUsedUpdated.csv pbdb_data.Ord.slim.csv Corrected R code for data cleaning and analyses This contains the updated steps to obtain basic latitudinal deviations i.e. to build a corrected version of Figure 3 from the paper. LatDevRcodeUpdated.R Equal area geographical cells These contain the details of the geographical cells used, obtained using R package 'icosa'. Palaeo222cells.csv Time bins appropriate for the data stages_2012PBDB.csv Prepared latitudinal deviation time series Contains the pre-prepared time series of latitudinal deviations for the Northern and Southern Hemispheres and using hemisphere switching. These are binned to stages. Also included are the binned temperature data from Veizer & Prokoph, 2015. TimeSeriesUsedUpdated.csv
description: The original results to
 Reddin et al. (2018) included an error in the code that intended to match
 geographical grid cells between neighbouring ages (‘matched-cells’
 hereon), via a nonsensical call to the <i>subset()</i>
 function. After correcting this coding mistake, the matched-cells approach
 was shown to be ineffective. Thanks are owed to Gwen S. Antell for
 noticing this error.