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TY - JOUR AU - Haim, A. AU - Heth, G. AU - Avnon, Z. AU - Nevo, E. PY - 1984 DA - 1984/03/01 TI - Adaptive physiological variation in nonshivering thermogenesis and its significance in speciation JO - Journal of Comparative Physiology B SP - 145 EP - 147 VL - 154 IS - 2 AB - Nonshivering thermogenesis (NST) magnitude was studied in the four chromosomal species of subterranean mole rats of theSpalax ehrenbergi superspecies in Israel. The four species show a distribution pattern which correlates with increasing aridity. The 2n=52 species inhabits the cold and humid regions, 2n=54 cold and dry, 2n-58 warm and humid, and 2n=60 the more arid regions in which temperatures fluctuate daily and annually. NST was measured as the ratio between maximal oxygen$$\dot V_{{\text{o}}_{\text{2}} }$$due to noradrenaline injection and minimal$$\dot V_{{\text{o}}_{\text{2}} }$$measured in anaesthetized animals. SN - 1432-136X UR - https://doi.org/10.1007/BF00684138 DO - 10.1007/BF00684138 ID - Haim1984 ER -