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Related Experiment Video

Updated: Feb 28, 2026

Analysis of Neural Crest Migration and Differentiation by Cross-species Transplantation
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Yolk removal generates hatching asynchrony in snake eggs.

Fabien Aubret1, Florent Bignon2, Alix Bouffet-Halle2

  • 1Station d'Ecologie Théorique et Expérimentale, Oula-Lab, CNRS, UMR 5321, 09200, Moulis, France. faubret@gmail.com.

Scientific Reports
|June 10, 2017
PubMed
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Snake embryos in smaller eggs may alter development rates to hatch synchronously. This study found yolk removal accelerated development and hatching, contrary to expectations for synchrony.

Area of Science:

  • Zoology
  • Developmental Biology
  • Ecology

Background:

  • Hatching synchrony is common in egg-laying species, potentially reducing predation risk.
  • In Natricine snakes, smaller eggs typically slow metabolism for synchronous hatching with larger eggs.

Purpose of the Study:

  • To investigate the mechanism of hatching synchrony in Natricine snakes.
  • To determine if egg mass influences developmental rates and hatching timing.

Main Methods:

  • Experimentally reduced yolk mass (7.2%) in half of the eggs from six snake clutches.
  • Monitored heart rates and hatching times of control and yolk-reduced eggs.

Main Results:

  • Yolk-reduced eggs exhibited higher heart rates throughout incubation.

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  • Yolk-reduced eggs hatched earlier and produced smaller hatchlings compared to controls.
  • Observed accelerated development in yolk-reduced eggs, contradicting expected synchronous hatching mechanisms.

    • Conclusions:

    • Egg mass influences developmental rates in snake eggs.
    • Yolk removal post-oviposition can accelerate embryonic development and advance hatching.
    • The observed increase in heart rate and earlier hatching in manipulated eggs requires further investigation.