Abstract
1. 1. Seasonal changes in cold-hardiness of three terrestrial Antarctic arthropods were investigated. 2. 2. Field microhabitat temperatures decreased from means of 11.2 in early February to 0.8°C by the end of March; this period represents a transition from austral mid-summer to autumn. 3. 3. Concurrent with microhabitat cooling, two freezing susceptible species, a mite, Alaskozetes antarcticus, and a collembolan, Cryptopyyus antarcticus, increased hardiness by depressing supercooling points (SCP) and accumulating cryoprotectants. 4. 4. The freezing tolerant chironomid, Belgica antarctica, increased SCPs from −10.2 to -5.0°C while attaining final cryoprotectant concentrations of 11.4/jg/mg (trehalose) and 7.0μg/mg (glucose).
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