Freezing Tolerance in an Adult Insect

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Science  03 Oct 1969:
Vol. 166, Issue 3901, pp. 105-106
DOI: 10.1126/science.166.3901.105


The adult carabid beetle Pterostichus brevicornis tolerates freezing under natural conditions. Laboratory tests confirm that winter beetles tolerate temperatures below -35°C, whereas summer beetles die if frozen at -6.6°C. Winter beetles can be cooled to about -10°C before freezing, and they thaw near -3.5°C. Summer beetles thaw at -0.7°C. To avoid freezing damage even in winter beetles, cooling rates must be near 20°C per hour or less.

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