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Background

The capacity for thermogenesis is considered part of an animal's adaptive strategy for survival,and basal metabolic rate (BMR) is one of the fundamental physiological standards for assessing the energy cost of thermoregulation in endotherms. BMR has been shown to be a highly flexible phenotypic trait both between,and within,species,but the metabolic mechanisms involved in the regulation of BMR,which range from variation in organ mass to biochemical adjustments,remain unclear. In this study,we investigated the relationship between organ mass,biochemical markers of metabolic tissue activity,and thermogenesis,in three species of small passerines: wild Bramblings (Fringilla montifringilla),Little Buntings (Emberiza pusilla) and Eurasian Tree Sparrows (Passer montanus),caught in Wenzhou,southeastern China.

Methods

Oxygen consumption was measured using an open-circuit respirometry system. Mitochondrial state-4 respiration and cytochrome c oxidase (COX) activity in liver and pectoral muscle were measured with a Clark electrode.

Results

Our results show that Eurasian Tree Sparrows had significantly higher BMR,digestive organ mass,mitochondrial state-4 respiration capacity and COX activity in liver and muscle,than Bramblings and Little Buntings. Furthermore,interspecific differences in BMR were strongly correlated with those indigestive tract mass,state-4 respiration and COX activity.

Conclusions

Our findings suggest that the digestive organ mass,state-4 respiration and COX activity play an important role in determining interspecific differences in BMR.


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Relationships between interspecific differences in the mass of internal organs, biochemical markers of metabolic activity, and the thermogenic properties of three small passerines

Show Author's information Minlan Bai1Xujian Wu1Kejing Cai1Weihong Zheng1,2Jinsong Liu1,2( )
School of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035, China
Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou 325035, China

Abstract

Background

The capacity for thermogenesis is considered part of an animal's adaptive strategy for survival,and basal metabolic rate (BMR) is one of the fundamental physiological standards for assessing the energy cost of thermoregulation in endotherms. BMR has been shown to be a highly flexible phenotypic trait both between,and within,species,but the metabolic mechanisms involved in the regulation of BMR,which range from variation in organ mass to biochemical adjustments,remain unclear. In this study,we investigated the relationship between organ mass,biochemical markers of metabolic tissue activity,and thermogenesis,in three species of small passerines: wild Bramblings (Fringilla montifringilla),Little Buntings (Emberiza pusilla) and Eurasian Tree Sparrows (Passer montanus),caught in Wenzhou,southeastern China.

Methods

Oxygen consumption was measured using an open-circuit respirometry system. Mitochondrial state-4 respiration and cytochrome c oxidase (COX) activity in liver and pectoral muscle were measured with a Clark electrode.

Results

Our results show that Eurasian Tree Sparrows had significantly higher BMR,digestive organ mass,mitochondrial state-4 respiration capacity and COX activity in liver and muscle,than Bramblings and Little Buntings. Furthermore,interspecific differences in BMR were strongly correlated with those indigestive tract mass,state-4 respiration and COX activity.

Conclusions

Our findings suggest that the digestive organ mass,state-4 respiration and COX activity play an important role in determining interspecific differences in BMR.

Keywords: State-4 respiration, Basal metabolic rate (BMR), Cytochrome c oxidase (COX), Fringilla montifringilla, Emberiza pusilla, Passer montanus

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Publication history
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Publication history

Received: 18 March 2016
Accepted: 28 May 2016
Published: 07 June 2016
Issue date: January 2016

Copyright

© 2016 The Author(s).

Acknowledgements

Acknowledgements

We thank Dr. Ron Moorhouse revising the English and giving some suggestions, and all the members of Animal Physiological Ecology Group, Wenzhou University Institute of Applied Ecology, for their helpful suggestions. This study was financially supported by Grants from the National Natural Science Foundation of China (No. 31470472), the National Undergraduate "Innovation" Project and Zhejiang Province's "Xinmiao" Project.

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