[Seasonal changes in the energy metabolism of subarctic rodents].
In widespread species, northern taiga voles, most significant differences in the intensity of energy metabolism (M), maximum (Mmax) and reserve (Mres) metabolism were observed at winter temperatures (-5-20 degrees C): Clethrionomys rutilus greater than C. rufocanus greater than Microtus oeconomus; differences in seasonal increase of Mmax and Mres exhibit an inverse proportion. Seasonal changes in M and Mmax in autochthonous tundra rodents indicate that Lemmus sibiricus belongs to a more eurybiont species as compared to Dicrostonyx torquatus. The main characteristic feature of seasonal adaptation of M in lemmings, as compared to voles, is the evident decrease of M value in winter which is accompanied by a more significant increase of Mmax and Mres. Operative pattern and high seasonal mobility of chemical thermoregulation in lemmings are suggested which account for adaptation of these animals mainly to short-term extreme effects of low temperatures.
Pastukhov
Iu F
IuF
Belogubova
E G
EG
D000818:Animals; D001110:Arctic Regions; D004734:Energy Metabolism / Q000502:physiology*; D010101:Oxygen Consumption / Q000502:physiology; D012377:Rodentia / Q000378:metabolism*; D012621:Seasons; D013696:Temperature; D014586:USSR
Sezonnye izmeneniia énergeticheskogo metabolizma u subarkticheskikh gryzunov.