Effects of body plan evolution on the hydrodynamic drag and energy requirements of swimming in ichthyosaurs

Research output: Contribution to journalArticle

Authors

  • Susana Gutarra
  • Benjamin Moon
  • Imran Rahman
  • Colin Palmer
  • Alison Brimacombe
  • Michael Benton

Colleges, School and Institutes

Abstract

Ichthyosaurs are an extinct group of fully marine tetrapods that were well adapted to aquatic locomotion. During their approximately 160 Myr existence, they evolved from elongate and serpentine forms into stockier, fish-like animals, convergent with sharks and dolphins. Here, we use computational fluid dynamics (CFD) to quantify the impact of this transition on the energy demands of ichthyosaur swimming for the first time. We run computational simulations of water flow using three-dimensional digital models of nine ichthyosaurs and an extant functional analogue, a bottlenose dolphin, providing the first quantitative evaluation of ichthyosaur hydrodynamics across phylogeny. Our results show that morphology did not have a major effect on the drag coefficient or the energy cost of steady swimming through geological time. We show that even the early ichthyosaurs produced low levels of drag for a given volume, comparable to those of a modern dolphin, and that deep ‘torpedo-shaped’ bodies did not reduce the cost of locomotion. Our analysis also provides important insight into the choice of scaling parameters for CFD applied to swimming mechanics, and underlines the great influence of body size evolution on ichthyosaur locomotion. A combination of large bodies and efficient swimming modes lowered the cost of steady swimming as ichthyosaurs became increasingly adapted to a pelagic existence.

Details

Original languageEnglish
Article number286
JournalRoyal Society of London. Proceedings B. Biological Sciences
Volume286
Issue number1898
Publication statusPublished - 6 Mar 2019

Keywords

  • CFD, fluid dynamics, ichthyosaurs, marine reptiles, marine tetrapods, swimming mechanics