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Updated: May 9, 2026

Thermal Limits Determination for Zooplankton Using a Heat Block

Thermal Limits Determination for Zooplankton Using a Heat Block

Published on: November 18, 2022

A Low Temperature Limit for Life on Earth.

Andrew Clarke¹, G John Morris, Fernanda Fonseca

¹British Antarctic Survey, High Cross, Madingley Road, Cambridge, United Kingdom ; School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom.

|July 11, 2013

Summary

The lower temperature limit for life on Earth is defined by vitrification, a non-lethal cell state induced by freezing. This process halts metabolism, establishing a critical thermal boundary for microbial and multicellular organisms.

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Area of Science:

Life sciences
Microbiology
Ecology

Background:

The lower temperature limit for life on Earth remains undefined.
Cellular response to freezing is critical for survival in cold environments.

Purpose of the Study:

To present empirical evidence defining the lower temperature limit for life.
To investigate the phenomenon of vitrification in microbial and multicellular organisms.

Main Methods:

Empirical observation of microbial cells cooling in the presence of external ice.
Analysis of cellular response to freeze-induced desiccation and vitrification.
Comparison of vitrification temperatures in unicellular and multicellular organisms.

Main Results:

Free-living microbial cells vitrify between -10°C and -26°C, ceasing metabolism due to high internal viscosity.
Vitrification is a survival mechanism, distinct from lethal intracellular freezing.
Multicellular organisms' cells vitrify at lower temperatures (below -50°C) when extracellular fluid undercools, but metabolic activity is limited below -2°C.

Conclusions:

Vitrification temperature serves as a general lower thermal limit for life.
Unicellular organisms have a higher vitrification limit (above -20°C) than multicellular organisms (below -20°C).
Environmental factors like extracellular ice presence significantly influence the lower temperature limit for life.