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The role of temperature as a driver of metabolic flexibility in the Red-billed Leiothrix(Leiothrix lutea)

Avian Research 2019年第4期10卷 485-496页

作者： Danqi Cui Na Wang Jingru Ge Jiaying Xu Weihong Zheng Jinsong Liu School of Life and Environmental Sciences Wenzhou UniversityWenzhou 325035China Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection Wenzhou 325035China

Background:The thermoregulatory ability of animals is strongly influenced by the temperature of their *** to cold requires a range of physiological and morphological *** this study,we tested the hypothesis that a small passerine,the Red-billed Leiothrix(Leiothrix lutea),can maintain homeothermy in cold conditions by adjusting the physiology and biochemistry of its tissue and organs and return to its former physiological and biochemical state when moved to a warm ***:Phenotypic variation in thermogenic activity of the Red-billed Leiothrixs(Leiothrix lutea)was investigated under warm(35℃),normal(25℃)or cold(15℃)ambient temperature *** consumption was measured using an open-circuit respirometry *** state-4 respiration and cytochrome-c oxidase(COX)activity in liver,kidney heart and pectoral muscle were measured with a Clark ***:Birds acclimated to an ambient temperature of 15℃ for 4 weeks significantly increased their basal metabolic rate(BMR)compared to a control group kept at 25℃.Birds acclimated to 35℃ decreased their BMR,gross energy intake(GEI)and digestible energy intake(DEI).Furthermore,birds acclimated to 15℃ increased state-4 respiration in their pectoral muscles and cytochrome-c oxidase(COX)activity in their liver and pectoral muscle,compared to the 25℃ control *** acclimated to 35℃ also displayed lower state-4 respiration and COX activity in the liver,heart and pectoral muscles,compared to those kept at 25℃.There was a positive correlation between BMR and state-4 respiration,and between BMR and COX activity,in all of the above organs except the liver and ***:Our study illustrates that the morphological,physiological,and enzymatic changes are associated with temperature acclimation in the Red-billed Leiothrix,and supports the notion that the primary means by which small birds meet the energetic challenges of cold conditions is through metabolic adj

关键词： Basal metabolic rate Cold acclimation Cytochrome C oxidase Leiothrix lutea state-4 respiration

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Seasonal phenotypic flexibility of body mass,organ masses,and tissue oxidative capacity and their relationship to BMR in Chinese bulbuls

Seasonal phenotypic flexibility of body mass,organ masses,an...

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浙江省动物学会第十二届会员代表大会暨学术讨论会

作者： Zheng Weihong Liu Jinsong School of Life and Environmental Sciences Wenzhou University Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection

Survival of small birds in fluctuating environments is facilitated by seasonal metabolic and morphological *** bulbuls Pycnonotus sinensis show winter increases in basal metabolic rate(BMR),nutritional organ masses,and liver and muscle cellular aerobic capacity relative to *** this study,we build on these previous studies by measuring seasonal adjustments in body mass(Mb),BMR,nutritional organ masses and several physiological, biochemical and hormonal markers over the entire annual cycle in wild-trapped Chinese bulbuls from Wenzhou,and we analyzed the relationships between variation in organ masses and cellular aerobic capacity and variation in BMR in individual birds.M and BMR were higher in spring (March to May) and winter(December to February) than in summer(June to August).The dry masses of several nutritional organs and mitochondrial protein content,state-4 respiration and cytochrome c oxidase(COX) activity in liver and muscle were all heightened in winter relative to other *** addition,heart and pectoral muscle,but not nutritional organ,dry masses and biochemical markers of cellular aerobic capacity in liver and muscle were positively correlated with *** triiodothyronine(T) concentration was higher in winter and spring than summer and autumn,and was positively correlated with BMR,mitochondrial protein content, state-4 respiration and COX activity in liver and *** results suggest that Chinese bulbuls rely on seasonal changes in nutritional organ masses as well as liver and muscle cellular aerobic capacity more than changes in skeletal muscle mass to promote seasonal metabolic flexibility.T appears to promote these seasonal thermoregulatory adjustments.

关键词： Pycnonotus sinensis seasonal acclimatization phenotypic flexibility basal metabolic rate(BMR) cytochrome c oxidase(COX) state-4 respiration thyroid hormone

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