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The social Matabeleland mole-rat Cryptomys hottentotus nimrodi occurs in both the high-and lowveld of Zimbabwe. The population in the highveld has a mean (± S. D.) resting metabolic rate (RMR) when acclimated for three months in the laboratory of 0.83 ± 0.04cm3 O2 g-l h-l (n=12) within the thermoneutral zone (TNZ) of 31-32°.

The body temperature (Tb) within the thermoneutral zone is low 34.4 ± 0.18 (n= 12) and remains stable at ambient temperatures (Ta s) from 25-32°. Above 32°, Tb increases albeit slightly to 36.6 ± 1.46° (n= 12). The conductance is high 0.17 0.02cm3 O2 g-1 h-°-1 (n= 24) at the lower limit of thermoneutrality. The mean RMR at 18° (the lowest Ta tested) was 2.29 ± 0.11 cm3 O2 g-1 h-1, which is 2.75 times that of the RMR in the TNZ.

The population in the lowveld has a mean (± S.D.) resting metabolic rate (RMR) when acclimated for three months in the laboratory of 0.95 ± 0.07 cm3 O2 g-1 h-1 (n= 12) within the themoneutral zone (TNZ) of 28-30 °.

The body temperature within the thermoneutral zone is low 34.0 ± 0.23 (n= 12) and remains stable at Tas from 25-30 °. Above 32 °, Tb increases, albeit slightly, to 37.8 ± 1.14 ° (n= 12).

The conductance is high 0.14 ± 0.09cm3 O2 g-1 h-1°-1 (n= 24) at the lower limit of thermoneutrality. The mean RMR at 18 ° (the lowest Ta tested) was 1.96 ± 0.12cm3 O2 g-1 h-1, which is 2.0 times that of the RMR in the TNZ.

These thermoregulatory parameters are compared with published data on other species of Cryptomys from Southern and Central Africa.