Supplementary material from "Phanerozoic pO2 and the early evolution of terrestrial animals"
Posted on 2018-01-11 - 10:22
Concurrent gaps in the Late Devonian/Mississippian fossil records of insects and tetrapods (i.e. Romer's Gap) have been attributed to physiological suppression by low atmospheric pO2. Here, updated stable isotope inputs inform a reconstruction of Phanerozoic oxygen levels that contradicts the low oxygen hypothesis (and contradicts the purported role of oxygen in the evolution of gigantic insects during the Late Palaeozoic), but reconciles isotope-based calculations with other proxies, like charcoal. Furthermore, statistical analysis demonstrates that the gap between the first Devonian insect and earliest diverse insect assemblages of the Pennsylvanian (Bashkirian Stage) requires no special explanation if insects were neither diverse nor abundant prior to the evolution of wings. Rather than tracking physiological constraint, the fossil record may accurately record the transformative evolutionary impact of insect flight.
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R. Schachat, Sandra; C. Labandeira, Conrad; Saltzman, Matthew R.; Cramer, Bradley D.; L. Payne, Jonathan; Boyce, C. Kevin (2018). Supplementary material from "Phanerozoic pO2 and the early evolution of terrestrial animals". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.3973998.v1
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AUTHORS (6)
SR
Sandra R. Schachat
CC
Conrad C. Labandeira
MS
Matthew R. Saltzman
BC
Bradley D. Cramer
JL
Jonathan L. Payne
CB
C. Kevin Boyce