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A new role for joint mobility in reconstructing vertebrate locomotor evolution
Armita R Manafzadeh1, Robert E Kambic2,3, Stephen M Gatesy4
1Department of Ecology and Evolutionary Biology, Brown University, Providence, RI 02912; armita_manafzadeh@brown.edu.
Summary
Researchers studied joint movement in birds and alligators to understand extinct animal locomotion. Their findings reveal how joint range of motion (ROM) can better reconstruct the movements of ancient reptiles and birds.
Area of Science:
- Paleontology and Evolutionary Biology
- Biomechanics and Functional Morphology
Background:
- Understanding extinct animal movement is key to tracing vertebrate locomotor evolution.
- Joint range of motion (ROM) estimates have historically excluded impossible poses from gait cycles.
Purpose of the Study:
- To demonstrate a novel method using comparative ROM data to better constrain locomotor reconstructions of extinct animals.
- To investigate the relationship between full joint mobility and poses used during locomotion in extant archosaurs.
Main Methods:
- Measured approximately 600,000 hindlimb joint poses from Helmeted Guineafowl and American alligators.
- Utilized joint mobility mapping to analyze the correlation between potential joint mobility and actual locomotor poses.
- Established an extant phylogenetic bracket for archosaurian ancestors and their descendants.
Main Results:
- Walking and running poses were found to be predictably situated within the full range of joint mobility.
- This reveals new constraints for reconstructing the locomotion of extinct archosaurs.
- A consistent relationship between full potential joint mobility and used joint poses was identified.
Conclusions:
- The developed inferential framework provides a more robust method for locomotor reconstructions.
- This approach can be extended to other animal groups to uncover evolutionary history.
- The study enhances our ability to unravel the history of vertebrate locomotor evolution.
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