Effects of long scotophase and cold acclimation on heat production in two diurnal rodents |
| |
Authors: | A. Haim |
| |
Affiliation: | (1) Manmal Research Institute, University of Pretoria, 0002 Pretoria, South Africa;(2) Present address: School of Education of the Kibbutz Movement, University of Haifa, Oranim, P. O., 36910 Kiryat Tivon, Israel |
| |
Abstract: | Summary Heat production of two diurnal rodents,Rhabdomys pumilio andLemniscomys griselda was measured in long scotophase-LS (8L: 16D; 25°C) acclimated and long scotophase and cold — LSAC (8L: 16D; 6°C) acclimated animals and compared to a control group (12L: 12D; 25°C).LS increased in both species. Further acclimation of LSAC increased inR. pumilio and decreased inL. griselda. LS increased body temperature (Tb) inL. griselda only. LS increased overall thermal conductance in both species. LSAC caused a further increase in this parameter inR. pumilio.A singificant (P<0.001) increase in the magnitude of maximal nonshivering thermogenesis (NST) was observed in both species due to LS acclimation. LSAC did not change this maximal NST but increased its obligatory part (minimal , P<0.05, inL. griselda, andP<0.001, inR. pumilio).The results of this study show that winter acclimatization of heat production mechanisms, in both species, may be due to extension of scotophase.Abbreviations LS long scotophase - LSAC long scotophase and cold - NA noradrenaline - NST nonshivering thermogenesis - RMR resting metabolic rate |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|