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首页> 外文期刊>Journal of Comparative Physiology, B. Biochemical, Systemic, and Environmental Physiology >Seasonal variation in body composition in an Afrotropical passerine bird: increases in pectoral muscle mass are, unexpectedly, associated with lower thermogenic capacity
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Seasonal variation in body composition in an Afrotropical passerine bird: increases in pectoral muscle mass are, unexpectedly, associated with lower thermogenic capacity

机译：在解冻旁角鸟类中的身体组成的季节性变化：胸肌质量的增加意外，与较低的热容量相关

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摘要

Phenotypic flexibility in avian metabolic rates and body composition have been well-studied in high-latitude species, which typically increase basal metabolic rate (BMR) and summit metabolism (M-sum) when acclimatized to winter conditions. Patterns of seasonal metabolic acclimatization are more variable in lower-latitude birds that experience milder winters, with fewer studies investigating adjustments in avian organ and muscle masses in the context of metabolic flexibility in these regions. We quantified seasonal variation (summer vs winter) in the masses of organs and muscles frequently associated with changes in BMR (gizzard, intestines and liver) and M-sum (heart and pectoral muscles), in white-browed sparrow-weavers (Plocepasser mahali). We also measured pectoral muscle thickness using a portable ultrasound system to determine whether we could non-lethally estimate muscle size. A concurrent study measured seasonal changes in BMR and M-sum in the same population of sparrow-weavers, but different individuals. There was no seasonal variation in the dry masses of the gizzard, intestines or liver of sparrow-weavers, and during the same period, BMR did not vary seasonally. We found significantly higher heart (similar to 18% higher) and pectoral muscle (similar to 9% higher) dry mass during winter, although ultrasound measurements did not detect seasonal changes in pectoral muscle size. Despite winter increases in pectoral muscle mass, M-sum was similar to 26% lower in winter compared to summer. To the best of our knowledge, this is the first study to report an increase in avian pectoral muscle mass but a concomitant decrease in thermogenic capacity.
机译：在高纬度物种中，禽类代谢速率和身体组成中的表型灵活性在高纬度物种中进行了很好地研究，这通常在适应冬季条件时增加基础代谢率（BMR）和峰会代谢（M-SUM）。季节性代谢适应范围的模式在低纬度鸟类中更具变量，体育冬季较温和的鸟类，在这些地区代谢灵活性的背景下调查禽木器官和肌肉群体的研究较少。我们在白眉的麻雀织造织物（Plocedpasser Mahali）中，我们量化了季节性的季节性变化（夏季VS冬季）和经常与BMR（G的肠道，肝脏）和M-SUM（心脏和胸肌）的变化相关联的肌肉（Plocedpasser Mahali） ）。我们还使用便携式超声系统测量胸肌厚度，以确定我们是否可以非致命地估计肌肉尺寸。并发研究测量了在同一麻雀 - 编织者群体中的BMR和M-SUM的季节变化，但不同的人。在令人痛苦的长袍，肠道或肝脏的干肿块中没有季节性变化，在同一时期，BMR并没有季节性季节性。虽然超声测量未检测到冬季肌肉尺寸的季节性变化，但我们发现显着更高的心脏（类似于18％的更高）和胸肌（类似于9％较高）的干肿块。尽管冬季肺肌肉质量增加，但与夏季相比，M-Sum与冬季相比下降26％。据我们所知，这是第一次报告禽胸肌肿块增加，但伴随的热容量降低。

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