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Area of Science:

  • Paleontology
  • Comparative Biology
  • Growth Modeling

Background:

  • Quantitative studies enable comparisons between extinct dinosaur growth and modern animal analogues.
  • Previous dinosaur growth research relied on limited models, potentially impacting conclusion validity.
  • Understanding dinosaur growth rates relative to modern species is crucial for evolutionary insights.

Purpose of the Study:

  • To investigate whether extinct dinosaurs exhibited faster growth rates than modern animals (birds and reptiles).
  • To apply a comprehensive class of growth models, specifically the von Bertalanffy-Pütter (BP) differential equation, to dinosaur and modern animal growth data.
  • To re-evaluate existing conclusions on dinosaur growth by utilizing a more robust modeling approach.

Main Methods:

  • Fitting growth data for *Tenontosaurus tilletti* (dinosaur), *Alligator mississippiensis* (reptile), and *Gallus gallus domesticus* (bird) to the von Bertalanffy-Pütter (BP) differential equation.
  • Utilizing a comprehensive class of growth models for enhanced accuracy.
  • Rescaling growth curves based on size, lifespan, age at inception point (maximal growth), and percentual growth for comparative analysis.

Main Results:

  • Best-fitting growth curves for *Tenontosaurus tilletti*, *Alligator mississippiensis*, and *Gallus gallus domesticus* showed minimal differences when rescaled for size and lifespan.
  • Discernible differences in growth patterns emerged when time was rescaled relative to the age at the inception point (maximal growth).
  • Comparative analysis of percentual growth also revealed distinctions between the studied species.

Conclusions:

  • The von Bertalanffy-Pütter (BP) model provides a more comprehensive framework for analyzing animal growth, including extinct dinosaurs.
  • Dinosaur and modern animal growth rates are broadly comparable when adjusted for size and lifespan.
  • Specific rescalings, such as age at maximal growth or percentual growth, highlight key differences in developmental timing and scaling between dinosaurs and extant species.