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The American shrew-mole (Neurotrichus gibbsii) seems to occupy an ecological and evo- lutionary position intermediate to that of shrews and fully fossorial moles. However, be- cause little is known regarding their physiology, we examined the metabolic rate and ther- moregulatory competence of 6 shrew-moles exposed to ambient temperatures ranging from 3t o 34 8C with flow-through respirometry. The basal rate of metabolism of N. gibbsii (3.94 ml O2 g21 h21; 77.90 J g21 h21) was 2.32 times greater than predicted for similar-sized placental mammals and close to that of soricine shrews of comparable mass (10-12 g). Over the entire range of test temperatures, mean body temperature (38.4 6 0.28C SE )o f this small semiterrestrial talpid was higher and more labile than that of other North Amer- ican moles but within the range typical for north-temperate soricids. With declining ambient temperatures, shrew-moles exhibited gradual reductions in body temperature and minimal whole-body thermal conductance. In 2 instances, shrew-moles were observed to enter an apparent state of hypometabolism. Whether the observed reductions in body temperature and metabolic rate of Neurotrichus exposed to low ambient temperatures are adaptive

THERMAL BIOLOGY AND METABOLISM OF THE AMERICAN SHREW-MOLE,NEUROTRICHUS GIBBSII