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Updated: Jul 25, 2026
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Monitoring Changes in the Intracellular Calcium Concentration and Synaptic Efficacy in the Mollusc Aplysia
Published on: July 15, 2012
pH and calcium concentration changes in a molluscan egg during development
Experientia
|June 15, 1979
Summary
As snail embryos develop, their egg albumen becomes more acidic. This change aids the embryo in absorbing the calcium carbonate eggshell for building its own shell.
Area of Science:
- Biochemistry
- Developmental Biology
- Malacology
Background:
- Calcified land snail eggs possess albumen that undergoes changes during embryonic development.
- Calcium carbonate (CaCO3) serves as the primary material for both the eggshell and the embryonic shell.
Purpose of the Study:
- To investigate the relationship between albumen pH, calcium concentration, and eggshell absorption during land snail embryonic development.
- To elucidate the mechanism by which developing snail embryos utilize their eggshell for skeletal formation.
Main Methods:
- Analysis of egg albumen during embryonic development.
- Measurement of albumen pH and calcium concentration.
- Correlation of biochemical changes with eggshell absorption.
Main Results:
- A direct correlation was observed between increasing acidity (decreasing pH) of the albumen and rising calcium concentration.
- The albumen's pH shift is directly linked to the embryonic absorption of the calcite eggshell.
Conclusions:
- The developing snail embryo likely releases an acidic metabolite, causing albumen acidification.
- This acidification facilitates the absorption of the calcium carbonate eggshell, providing material for the embryonic aragonite shell.
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