10.5061/DRYAD.NK218HT
Franeck, Franziska
University of Oslo
Liow, Lee Hsiang
University of Oslo
Data from: Dissecting the paleocontinental and paleoenvironmental dynamics
of the Great Ordovician Biodiversification
Dryad
dataset
2018
genus richness
capture-recapture
onshore-offshore
Marine invertebrates
Great Ordovician Biodiversification Event
2018-12-27T15:21:42Z
2018-12-27T15:21:42Z
en
https://doi.org/10.1017/pab.2019.4
4386647 bytes
2
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
The Ordovician is a time of drastic biological and geological change.
Previous work has suggested that there was a dramatic increase in global
diversity during this time, but also indicated that regional dynamics and
dynamics in specific environments might have been different. Here, we
contrast two paleocontinents that have different geological histories
through the Ordovician, namely Laurentia and Baltica. The first was
situated close to the equator throughout the whole Ordovician, while the
latter has traversed tens of latitudes during the same time. We predict
that Baltica, which was under long-term environmental change, would show
greater average and interval-to-interval origination and extinction rates
than Laurentia. In addition, we are interested in the role of the
environment in which taxa originated, specifically, the patterns of
onshore-offshore dynamics of diversification, where onshore and offshore
areas represent high-energy and low-energy environments, respectively.
Here, we predict that high-energy environments might be more conducive for
originations. Our new analyses show that the global Ordovician spike in
genus richness from the Dapingian to the Darriwilian Stage resulted from a
very high origination rate at the Dapingian/Darriwilian boundary, while
the extinction rate remained low. We found substantial
interval-to-interval variation in the origination and extinction rates in
Baltica and Laurentia but the probabilities of origination and extinction
are somewhat higher in Baltica than Laurentia. Onshore and offshore areas
have largely indistinguishable origination and extinction rates, in
contradiction to our predictions. The global spike in origination rates at
the Dapingian/Darriwilian boundary is apparent in Baltica, Laurentia,
onshore and offshore areas, and abundant variability in diversification
rates are apparent over other time intervals for these paleocontinents and
paleoenvironments. This observation hints at global mechanisms for the
spike in origination rates at the Dapingian/Darriwilian boundary but a
domination of more regional and local mechanisms over other time intervals
in the Ordovician.
Codes and PBDB download for Franeck and Liow 2019PBDB_Ord_1.csv -
downloaded data from PBDB; Franeck_and_Liow_global - global
diversification and diversity dynamics; Franeck_and_Liow_PC -
paleocontinental diversification and diversity dynamics;
Franeck_and_Liow_onoff_ext - diversification and diversity analysis based
on last occurrence in onshore or offshore areas;
Franeck_and_Liow_onoff_orig - diversification and diversity analysis based
on first occurrence in onshore or offshore areas;
Franeck_and_Liow_globalStages - global analysis based on data assigned to
global Stages only; Franeck_and_Liow_phyla - analysis of different phyla
in SI; Franeck_and_Liow_classes - analysis of different classes in
SIFraneckandLiow.codes.7zSupplemental Information for Franeck and Liow
2019FraneckandLiow_Supplement.pdf