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Nat Commun. 2014 Aug 18;5:4658. doi: 10.1038/ncomms5658.

Sea surface temperature contributes to marine crocodylomorph evolution.

Author information

1
1] School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK [2] UMR 5276 CNRS, Laboratoire de Géologie de Lyon, Terre, Planètes et Environnement, ENS de Lyon et Université de Lyon, Ecole Normale Supérieure de Lyon, Lyon 69364, France.
2
UMR 5276 CNRS, Laboratoire de Géologie de Lyon, Terre, Planètes et Environnement, ENS de Lyon et Université de Lyon, Ecole Normale Supérieure de Lyon, Lyon 69364, France.
3
1] UMR 5276 CNRS, Laboratoire de Géologie de Lyon, Terre, Planètes et Environnement, ENS de Lyon et Université de Lyon, Ecole Normale Supérieure de Lyon, Lyon 69364, France [2] Institut Universitaire de France, France.
4
School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK.

Abstract

During the Mesozoic and Cenozoic, four distinct crocodylomorph lineages colonized the marine environment. They were conspicuously absent from high latitudes, which in the Mesozoic were occupied by warm-blooded ichthyosaurs and plesiosaurs. Despite a relatively well-constrained stratigraphic distribution, the varying diversities of marine crocodylomorphs are poorly understood, because their extinctions neither coincided with any major biological crises nor with the advent of potential competitors. Here we test the potential link between their evolutionary history in terms of taxic diversity and two abiotic factors, sea level variations and sea surface temperatures (SST). Excluding Metriorhynchoidea, which may have had a peculiar ecology, significant correlations obtained between generic diversity and estimated Tethyan SST suggest that water temperature was a driver of marine crocodylomorph diversity. Being most probably ectothermic reptiles, these lineages colonized the marine realm and diversified during warm periods, then declined or became extinct during cold intervals.

PMID:
25130564
DOI:
10.1038/ncomms5658
[Indexed for MEDLINE]

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