Phylogenetic evidence for mid-Cenozoic turnover of a diverse continental biota

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Abstract

Rapid climatic change at the beginning of the Oligocene epoch is concordant with global biotic turnover in the fossil record. However, while Southern Hemisphere geological movement played a key role in shaping these global climatic shifts, given generally poor terrestrial fossil records, evidence for matching turnover in entire Austral biotas is lacking. Emerging comprehensive phylogenetic frameworks provide alternative avenues to explore for signals of mass turnover or restructuring. Here, we combine phylogenetic data with empirical and simulation-based approaches to understand the temporal dynamics of the origins of a diverse and highly endemic continental biota (Australian lizards and snakes). These analyses indicate that the temporal clustering of major radiation ages in Gondwanan endemic lineages and immigration into Australia is narrower than expected under time-continuous models assuming no overarching external perturbation. Independent phylogenetic dating analyses further indicate that the timing of both processes is concentrated in the period post-dating the Eocene–Oligocene transition (~34 million years ago). Epoch-defining processes around the start of the Oligocene appear to have also played a decisive role in reshaping a diverse Southern Hemisphere biota—by both re-setting Gondwanan endemic diversity and opening the way to successful immigration from the north.

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Fig. 1: Phylogenetic position, age and origins of Australian squamates.

images: Mark Hutchinson (elapids, pythons, blindsnake, Eugongylus group, Sphenomorphus group and Ctenotus); Brad Maryan (Varanus, Crenadactylus and Pygopodidae); Paul Oliver (Gehyra and Agamids); and Juniors Bildarchiv GmbH/Alamy Stock Photo (Egernia).

Fig. 2: Crown and stem ages for extant Australian squamate groups.
Fig. 3: Maximum likelihood ancestral states and time-dependent BiSSE analyses of immigration into Australia.
Fig. 4: Observed versus expected temporal spread (s.d./mean) of crown ages for Australian lineages given the length of time they have been present in Australia.

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Acknowledgements

P.M.O. was supported by a McKenzie Postdoctoral Fellowship from the University of Melbourne and an Australian Reseach Council Early Career Researcher Fellowship. We thank L. Bromham, M. Cardillo, M. Novosolov and C. Moritz for comments.

Author information

P.M.O. and A.F.H. conceived the project, undertook the analyses and wrote the paper.

Correspondence to Paul M. Oliver.

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