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Evolutionary drivers, morphological evolution and diversity dynamics of a surviving mammal clade: cainotherioids at the Eocene–Oligocene transition

Abstract : The Eocene–Oligocene transition (EOT) represents a period of global environmental changes particularly marked in Europe and coincides with a dramatic biotic turnover. Here, using an exceptional fossil preservation, we document and analyse the diversity dynamics of a mammal clade, Cainotherioidea (Artiodactyla), that survived the EOT and radiated rapidly immediately after. We infer their diversification history from Quercy Konzentrat–Lagerstätte (south-west France) at the species level using Bayesian birth–death models. We show that cainotherioid diversity fluctuated through time, with extinction events at the EOT and in the late Oligocene, and a major speciation burst in the early Oligocene. The latter is in line with our finding that cainotherioids had a high morphological adaptability following environmental changes throughout the EOT, which probably played a key role in the survival and evolutionary success of this clade in the aftermath. Speciation is positively associated with temperature and continental fragmentation in a time-continuous way, while extinction seems to synchronize with environmental change in a punctuated way. Within-clade interactions negatively affected the cainotherioid diversification, while inter-clade competition might explain their final decline during the late Oligocene. Our results provide a detailed dynamic picture of the evolutionary history of a mammal clade in a context of global change.
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https://hal.archives-ouvertes.fr/hal-03246655
Contributor : Romain Weppe Connect in order to contact the contributor
Submitted on : Monday, October 11, 2021 - 11:21:53 AM
Last modification on : Wednesday, November 17, 2021 - 12:31:41 PM

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R. Weppe, Maëva Orliac, Guillaume Guinot, Fabien L. Condamine. Evolutionary drivers, morphological evolution and diversity dynamics of a surviving mammal clade: cainotherioids at the Eocene–Oligocene transition. Proceedings of the Royal Society B: Biological Sciences, Royal Society, The, 2021, 288 (1952), pp.20210173. ⟨10.1098/rspb.2021.0173⟩. ⟨hal-03246655⟩

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