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Freezing at higher temperatures is advantageous because the rate of ice formation is slower, allowing the insect time to adjust to the internal changes that result from ice formation. [ 24 ] Most freeze-tolerant species restrict ice formation to extracellular spaces, as intracellular ice formation is usually lethal.
American cockroaches generally live in moist areas but can survive in dry areas if they have access to water. They prefer high temperatures around 29 °C (84 °F) and do not tolerate low temperatures. These cockroaches are common in basements, crawl spaces, cracks and crevices of porches, foundations, and walkways adjacent to buildings.
Cockroach nymphs (Periplaneta japonica) survive short periods of freezing at -6 to -8 °C. The red flat bark beetle ( Cucujus clavipes ) can survive after being frozen to -150 °C. [ 6 ] The fungus gnat Exechia nugatoria can survive after being frozen to -50 °C, by a unique mechanism whereby ice crystals form in the body but not the head.
In cold climates, they occur only near human dwellings, because they cannot survive severe cold. However, German cockroaches have been found as inquilines ("tenants") of human buildings as far north as Alert, Nunavut. [10] Similarly, they have been found as far south as southern Patagonia. [11] Though nocturnal, the German cockroach
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Non-acclimatized individuals can survive −5 °C, while an acclimatized individual in the same species can survive −30 °C. Plants that originated in the tropics, like tomato or maize, don't go through cold hardening and are unable to survive freezing temperatures. [3]
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