Life history variation across the end-Triassic mass extinction in South Africa

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Life history variation across the end-Triassic mass extinction in South Africa

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CaseHeader

Status:

Final Permit Report Pending

HeritageAuthority(s):

SAHRA
ECPHRA

Case Type:

Permits

ProposalDescription:

This research aims to investigate the underlying reasons for faunal turnover across the end-Triassic extinction event, as a means of understanding biotic responses to mass extinctions in general.

Expanded_Motivation:

Previous approaches have focused on a relatively narrow array of traits (e.g., body mass, discrete character evolution) that are relatively coarse proxies for biological variables. Here, we plan to use a multi-proxy approach, incorporating a novel set of life history variables as well as a tested suite of variables. The Elliot Formation in the Karoo Basin of South Africa preserves a complete sequence of uppermost Triassic and lowermost Jurassic strata and contains the best continental record of the end-Triassic extinction and the tetrapods living through this event. Life history and ecological data will be used in a biostratigraphic framework to assess the faunal turnover of Late Triassic and Early Jurassic taxa from the Elliot Formation. This information will ultimately be used in a broader framework to investigate the Triassic continental ecological reorganization when archosauromorphs (including dinosaurs) essentially replaced non-mammalian synapsids (therapsids) as the dominant large-bodied tetrapods. Thus, the data obtained in this project aims to (1) investigate the faunal turnover across the end-Triassic extinction event in the South African Karoo Basin, (2) compare the community dynamics of the Early Jurassic post-extinction ecosystem with the Early Triassic recovery period following the Permo-Triassic mass extinction and (3) assess the long term Triassic faunal turnover to determine the underlying biotic divergences between two major clades, non-mammalian synapsids and archosauromorphs.