Large muscles are beneficial but not required for improving thermogenic capacity in small birds
| Autor: | Myriam Milbergue, Pierre U. Blier, François Vézina |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
030110 physiology
0301 basic medicine Muscle size Acclimatization lcsh:Medicine Muscle mass Pectoralis Muscles Songbirds 03 medical and health sciences Animal science Cold acclimation medicine Animals Muscle Skeletal Pectoralis Muscle lcsh:Science Multidisciplinary biology lcsh:R Thermogenesis biology.organism_classification Skeletal muscle mass Poecile Body Composition Shivering lcsh:Q Basal Metabolism Seasons medicine.symptom Energy Metabolism |
| Zdroj: | Scientific Reports, Vol 8, Iss 1, Pp 1-11 (2018) |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-018-32041-w |
| Popis: | It is generally assumed that small birds improve their shivering heat production capacity by developing the size of their pectoralis muscles. However, some studies have reported an enhancement of thermogenic capacity in the absence of muscle mass variation between seasons or thermal treatments. We tested the hypothesis that an increase in muscle mass is not a prerequisite for improving avian thermogenic capacity. We measured basal (BMR) and summit (Msum) metabolic rates of black capped chickadees (Poecile atricapillus) acclimated to thermoneutral (27 °C) and cold (−10 °C) temperatures and obtained body composition data from dissections. Cold acclimated birds consumed 44% more food, and had 5% and 20% higher BMR and Msum, respectively, compared to individuals kept at thermoneutrality. However, lean dry pectoralis and total muscle mass did not differ between treatments, confirming that the improvement of thermogenic capacity did not require an increase in skeletal muscle mass. Nevertheless, within temperature treatments, Msum was positively correlated with the mass of all measured muscles, including the pectoralis. Therefore, for a given acclimation temperature individuals with large muscles do benefit from muscle size in term of heat production but improving thermogenic capacity during cold acclimation likely requires an upregulation of cell functions. |
| Databáze: | OpenAIRE |
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