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Seasonal changes in cryoprotectants concentrations in Helix pomatia snails
A Nowakowska1, M Caputa, J Rogalska
1Department of Animal Physiology, Institute of General and Molecular Biology, N. Copernicus University, Torun, Poland.
Summary
Terrestrial snails use glycerol and glucose as cryoprotectants. Winter conditions elevate these compounds, with glycerol playing a key role in cold adaptation, while glucose appears less significant for snail cryoprotection.
Area of Science:
- Zoology
- Environmental Physiology
- Biochemistry
Background:
- Terrestrial snails face seasonal freezing temperatures.
- Understanding cryoprotectant roles is crucial for snail survival.
Purpose of the Study:
- Investigate seasonal hemolymph cryoprotectant shifts (glycerol, glucose) in snails.
- Determine if cold and short-day acclimation induces cryoprotectant synthesis.
- Clarify the specific roles of glycerol and glucose in snail cryoprotection.
Main Methods:
- Measured hemolymph glycerol and glucose concentrations seasonally.
- Assessed liver glycogen content.
- Exposed snails to cold (5°C) and short-day photoperiod during summer for acclimation studies.
Main Results:
- Hemolymph glycerol and glucose concentrations were higher in winter than in summer.
- Cryoprotectant levels did not correlate with liver glycogen content.
- Summer acclimation to cold and short days selectively increased glycerol concentration.
Conclusions:
- Glycerol is likely a key cryoprotectant for terrestrial snails adapting to winter cold.
- Glucose is less likely to provide significant cryoprotection in these snails.
