Correlative influence of gut appearance, water content and thermal hysteresis on whole body supercooling point of adult bark beetles, Ips acuminatus Gy11
1995
Gehrken, U.
Adults of the bark beetle Ips acuminatus rely upon supercooling for overwintering success. In preparation for winter, individuals stop feeding, and increase their supercooling capacity. Isolated alimentary canals froze within the temperature range of intact adults, and the agents responsible for nucleation were of a proteinaceous nature. Enhanced supercooling from -12 to -17 degrees could be attributed to the evacuation of residual food from the gut and a reduction in water content, while a further shift to -20 degrees C was closely correlated with the level of thermal hysteresis. The principle carbohydrate present during autumn, the disaccharide trehalose, increased from 10 mM at the end of August to 90 mM in November, and seemed to account for a decrease in supercooling points of approximately 1.5 degrees C.
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