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Sea surface temperature contributes to marine crocodylomorph evolution.

Jeremy E Martin1, Romain Amiot2, Christophe Lécuyer3

  • 11] 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.

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|August 19, 2014
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Summary
This summary is machine-generated.

Marine crocodylomorphs thrived in warm seas during the Mesozoic and Cenozoic eras. Their diversity was driven by sea surface temperatures (SST), with ectothermic reptiles declining in colder intervals.

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Area of Science:

  • Paleontology
  • Marine Biology
  • Climate Science

Background:

  • Four distinct crocodylomorph lineages adapted to marine environments during the Mesozoic and Cenozoic.
  • Marine crocodylomorphs were absent from high latitudes, unlike warm-blooded marine reptiles like ichthyosaurs and plesiosaurs.
  • The varying diversity and extinction patterns of marine crocodylomorphs are not well understood, as they don't align with major extinction events or the emergence of competitors.

Purpose of the Study:

  • To investigate the relationship between marine crocodylomorph diversity and abiotic factors.
  • To test the hypothesis that sea level variations and sea surface temperatures (SST) influenced marine crocodylomorph evolutionary history.

Main Methods:

  • Analysis of stratigraphic distribution of marine crocodylomorph taxa.
  • Correlation analysis between generic diversity and estimated Tethyan sea surface temperatures (SST).
  • Consideration of sea level variations as a potential influencing factor.

Main Results:

  • Significant correlations were found between the generic diversity of marine crocodylomorphs (excluding Metriorhynchoidea) and estimated Tethyan SST.
  • Water temperature emerged as a key driver of marine crocodylomorph diversity.
  • Evidence suggests these ectothermic reptiles colonized and diversified during warm periods.

Conclusions:

  • Sea surface temperature (SST) played a significant role in shaping the diversity of marine crocodylomorphs.
  • Marine crocodylomorphs likely colonized and diversified in warmer climatic conditions.
  • Colder intervals may have led to the decline or extinction of these marine reptiles.