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Related Experiment Videos

Neoteny and the thyroid in ratites

A Dawson1

  • 1Institute of Terrestrial Ecology, Huntingdon, Cambs, UK.

Reviews of Reproduction
|May 1, 1996
PubMed
Summary

Thyroid hormones may explain how flightless ratites, like ostriches, evolved from flying birds through neoteny. This review explores thyroid function

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Area of Science:

  • Evolutionary biology
  • Endocrinology
  • Vertebrate paleontology

Background:

  • Ratites (e.g., ostriches, emus) are flightless birds considered neotenous descendants of flying ancestors.
  • Neoteny, the retention of juvenile features into adulthood, is well-documented in amphibians, where thyroid hormones regulate metamorphosis.
  • Understanding neoteny's evolutionary drivers in birds is crucial for avian evolutionary studies.

Purpose of the Study:

  • To review the potential role of thyroid hormones in the evolution of neoteny in ratites.
  • To explore evidence linking thyroid function to ratite characteristics and evolutionary history.

Main Methods:

  • Literature review of neoteny in vertebrates, focusing on amphibians and birds.
  • Analysis of ratite characteristics that may suggest thyroid abnormalities.
  • Comparison of ratites with thyroidectomized non-ratite birds.
  • Inclusion of preliminary findings from ostrich thyroid function studies.

Main Results:

  • The thyroid gland's role in amphibian neoteny provides a potential model for avian neoteny.
  • Specific ratite traits may indicate underlying thyroid system differences.
  • Similarities exist between ratites and experimentally thyroid-affected birds.
  • Initial studies suggest altered thyroid function in ostriches.

Conclusions:

  • Thyroid hormones are hypothesized to be a significant factor in the evolutionary development of ratite neoteny.
  • Further research into thyroid function in ratites is warranted to confirm this hypothesis.
  • This perspective offers a novel endocrinological explanation for a major evolutionary transition in birds.

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