4 Works

Data from: Morphological and biomechanical disparity of crocodile-line archosaurs following the end-Triassic extinction

Thomas L. Stubbs, Stephanie E. Pierce, Emily J. Rayfield & Philip S. L. Anderson
Mesozoic crurotarsans exhibited diverse morphologies and feeding modes, representing considerable ecological diversity, yet macroevolutionary patterns remain unexplored. Here we employ a unique combination of morphological and biomechanical disparity metrics to quantify the ecological diversity and trophic radiations of Mesozoic crurotarsans, using the mandible as a morpho-functional proxy. We recover three major trends. First, the diverse assemblage of Late Triassic crurotarsans was morphologically and biomechanically disparate, implying high levels of ecological variation; but, following the end-Triassic...

Data from: Pulmonary anatomy in the Nile crocodile and the evolution of unidirectional airflow in Archosauria.

Emma R. Schachner, John R. Hutchinson, C. G. Farmer & CG Farmer
The lungs of birds have long been known to move air in only one direction during both inspiration and expiration through most of the tubular gas-exchanging bronchi (parabronchi). Recently a similar pattern of airflow has been observed in American alligators, a sister taxon to birds. The pattern of flow appears to be due to the arrangement of the primary and secondary bronchi, which, via their branching angles, generate inspiratory and expiratory aerodynamic valves. Both the...

Data from: Linking the evolution of body shape and locomotor biomechanics in bird-line archosaurs

Vivian Allen, Karl T. Bates, Zhiheng Li & John R. Hutchinson
Locomotion in living birds (Neornithes) has two remarkable features: feather-assisted flight, and the use of unusually crouched hindlimbs for bipedal support and movement. When and how these defining functional traits evolved remains controversial. However, the advent of computer modelling approaches and the discoveries of exceptionally preserved key specimens now make it possible to use quantitative data on whole-body morphology to address the biomechanics underlying this issue. Here we use digital body reconstructions to quantify evolutionary...

Data from: Feasting in fresh water: impacts of food concentration on freshwater tolerance and the evolution of food x salinity response during the expansion from saline into fresh water habitats

Carol Eunmi Lee, Wynne E. Moss, Nora Olson, Kevin Fongching Chau, Yu-Mei Chang & Kelsey E. Johnson
Saline to freshwater invasions have become increasingly common in recent years. A key hypothesis is that rates of freshwater invasions have been amplified in recent years by increased food concentration, yet this hypothesis has remained unexplored. We examined whether elevated food concentration could enhance freshwater tolerance, and whether this effect evolves following saline to freshwater invasions. We examined physiological response to salinity and food concentration in a 2 × 2 factorial design, using ancestral brackish...

Registration Year

  • 2013

Resource Types

  • Dataset


  • Royal Veterinary College
  • University of Wisconsin-Madison
  • Chinese Academy of Sciences
  • University of Utah
  • University of Liverpool
  • University of Bristol
  • Friedrich Schiller University Jena