Effects of long scotophase and cold acclimation on heat production in two diurnal rodents期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Effects of long scotophase and cold acclimation on heat production in two diurnal rodents

Authors:	A Haim

Institution:	(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 $(\dot V_{O_2 } )$ 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 $\dot V_{O_2 }$ in both species. Further acclimation of LSAC increased $\dot V_{O_2 }$ inR. pumilio and decreased $\dot V_{O_2 }$ inL. griselda. LS increased body temperature (T _b) 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 $\dot V_{O_2 }$ , 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

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