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Related Experiment Videos

Frogs without polliwogs: evolution of anuran direct development.

E M Callery1, H Fang, R P Elinson

  • 1Department of Biochemistry and Cell Biology, SUNY, Stony Brook, NY 11794, USA.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|February 27, 2001
PubMed
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Direct development in frogs bypasses larval stages, evolving due to ecological pressures. Even without free-living larvae, metamorphosis is triggered by thyroid hormones before hatching.

Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Herpetology

Background:

  • Direct development, the absence of a free-living larval stage, is a derived life-history strategy in amphibians.
  • Ecological factors are hypothesized to drive the evolution of direct development in frogs.
  • Understanding the developmental modifications underlying this strategy is crucial for evolutionary insights.

Purpose of the Study:

  • To explore the ecological factors that promote the evolution of direct development in frogs.
  • To investigate the developmental modifications enabling direct embryogenesis in direct-developing frogs.
  • To examine the role of thyroid hormones in the pre-hatching metamorphosis of direct-developing frogs.

Main Methods:

  • Comparative analysis of ecological pressures across frog species.

Related Experiment Videos

  • Detailed examination of developmental adaptations in direct-developing frogs, such as Eleutherodactylus coqui.
  • Hormonal assays and developmental stage analysis to understand metamorphosis timing.

    • Main Results:

    • Direct development in Eleutherodactylus coqui involves adaptations for large egg size and loss of larval structures.
    • Despite direct development, Eleutherodactylus coqui exhibits a thyroid hormone-dependent metamorphosis.
    • This metamorphosis occurs internally, prior to the organism hatching from the egg.

    Conclusions:

    • Direct development represents a significant evolutionary shift in amphibian life history.
    • The evolution of direct development involves complex rearrangements of ancestral biphasic developmental patterns.
    • Thyroid hormone-mediated metamorphosis persists even in the absence of a free-living larval stage, highlighting developmental plasticity.