Cold hardiness of terrestrial mites at Signy Island, maritime Antarctic

摘要: (1) The cold hardiness of four species was studied in respect supercooling ability, cryoprotective substances, chill-coma temperatures and survival under anaerobiosis. effects low temperature acclimation starvation on were examined experimentally. (2) Mean points field animals ranged from -6.1? to -28.80C during Jan-Mar 1980. In Nanorchestes antarcticus (Strandtmann) Alaskozetes (Michael), a bimodal distribution individual occurred with the group (LG) consisting without gut nucleators. Stereotydeus villosus (Trouessart) Gamasellus racovitzai only high (HG) present supercooling-point distributions. (3) all species, except predatory G. racovitzai, combined exposure for various time periods lowered mean point. This associated increased concentrations glycerol body fluid. Glucose, ribitol mannitol together straight chain hydrocarbons also detected extracts by GLC techniques. (4) Chill-coma varied -4.5' -8.00C. (5) Under anoxia at 0WC, A. greater than that later nymphal stages being slightly more resistant adults.