Data from: Regional and environmental variation in escalatory ecological trends during the Jurassic: a western Tethys hotspot for escalation?
Monarrez, Pedro M., University of Georgia
Aberhan, Martin, University of Georgia
Holland, Steven M.
Published Apr 13, 2017 on Dryad.
Cite this dataset
Monarrez, Pedro M.; Aberhan, Martin; Holland, Steven M. (2017). Data from: Regional and environmental variation in escalatory ecological trends during the Jurassic: a western Tethys hotspot for escalation? [Dataset]. Dryad. https://doi.org/10.5061/dryad.ds4gd
Understanding the drivers of macroevolutionary trends through the Phanerozoic has been a central question in paleobiology. Increasingly important is understanding the regional and environmental variation of macroevolutionary patterns and how they are reflected at the global scale. Here we test the role of biotic interactions on regional ecological patterns during the Mesozoic marine revolution. We test for escalatory trends in Jurassic marine benthic macroinvertebrate ecosystems using occurrence data from the Paleobiology Database parsed by region and environment. The escalation hypothesis posits that taxonomic groups that could adapt to intense predation and bioturbation proliferated, whereas groups unable to adapt were reduced in diversity and abundance or driven to extinction. We tested this hypothesis in five regions during Jurassic stages and among four depositional environments in Europe. Few escalatory trends were detected, although at least one escalatory trend was observed in every region, with the greatest number and strongest trends observed in Europe. These trends include increases in shallow infauna and cementing epifauna and occurrences of facultatively mobile invertebrates and decreases in pedunculate, free-lying, and sessile epifauna. Within Europe, escalatory trends occur in shallow-water environments but also in deeper-water environments, where they are predicted not to occur. When regional trends are aggregated, trends in Europe drive the global signal. The results of this study suggest that while evidence of escalation is rare globally, it is plausible that escalation drove macroevolutionary patterns in Europe. Furthermore, these results underline the need to dissect global fossil data at the regional scale to understand global macroevolutionary dynamics.
Paleobiology Database occurrence file used for analysis
Paleobiology Database occurrence file with regions analyzed added
List of paleocoordinates used to create regions of occurrences analyzed
Text file with R script used to assign regions to PBDB occurrence file.
R function to calculate confidence intervals on percentages based on David Raup's method.
R function used to calculate the percent ecologic traits.
Regional Occurrence Percentages
Text file with R script that calculates the percent occurrences of individual ecological traits in each region.
Global Occurrence Percentages
Text file of R script used calculate the global percent occurrence of individual ecological traits.
Europe Environments Occurrence Percentages
Text file of R script used to calculate percent occurrences of individual ecological traits by European depositional environment.
Text file of R script to perform a 10,000 randomization permutation shuffling time bins of global occurrences.
Text file of R script to perform a 10,000 randomization permutation shuffling time bins of European occurrences.
Text file of R script to perform a 10,000 randomization permutation shuffling occurrences by regions.
Text file of R script to calculate the percent occurrences by shell mineralogy.
Plot of percent occurrences by shell mineralogy.
SOM Table 1
Supplementary table of Spearman’s rank correlation tests of changes in tiering by taxonomic groups over time during the Jurassic in Europe.