Metabolic thermogenesis and evaporative water loss in the Hwamei Garrulax canorus

Metabolic thermogenesis and evaporative water loss in the Hwamei Garrulax canorus
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华美噪鹛的代谢产热和蒸发水损失

DOI:
10.1016/j.jtherbio.2013.10.003
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发表时间:
2013-12
影响因子:
2.7
通讯作者:
Liu Jin–Song
Liu Jin–Song
中科院分区:
生物学3区
文献类型:
--
作者:
Xia Su–Su;Yu An–Wei;Zhao Li–Dan;Zhang Hui–Ying;Zheng Wei–Hong;Liu Jin–Song

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基础代谢率(BMR)被认为是连接生活史特征的生理机制网络中的主要枢纽。蒸发水损失(EWL)是一种生理指标,广泛用于测量不同环境中鸟类种间或种内研究中的水分关系。在这项研究中,我们通过测量 5 至 40 °C 环境温度 (Ta) 下的体温 (Tb)、代谢率 (MR) 和 EWL,研究了适应夏季的 HwameiGarrulax canorusto 温度的生理反应。总体而言,我们发现平均体温为 42.4 °C,在 5 至 20 °C 之间测量的平均最小热导 (C) 为 0.15 ml O2g−1h−1°C−1。热中性区 (TNZ) 为 31.8–35.3 °C,BMR 为 181.83 ml O2h−1。在下临界温度以下,MR随着Ta的减小而线性增加,根据关系:MR(ml O2h−1)=266.59–2.66Ta。当Tas高于上临界温度时,MR随着Ta的增加而增加,根据关系式:MR(ml O2h−1)=−271.26+12.85Ta。 EWL 随 Ta 的增加而增加,其关系如下:EWL (mg H2O h−1)=−19.16+12.64 Ta,并且在 Ta>14.0 °C 时超过代谢水产生量。华美族的高Tband热导率、低BMR、窄TNZ和高蒸发水产量/代谢水产量(EWP/MWP)比率与该物种适应温暖、温和气候的观点一致,在这些气候中,代谢生热和水保存不是强选择压力。
Basal metabolic rate (BMR) is thought to be a major hub in the network of physiological mechanisms connecting life history traits. Evaporative water loss (EWL) is a physiological indicator that is widely used to measure water relations in inter- or intraspecific studies of birds in different environments. In this study, we examined the physiological responses of summer-acclimatized HwameiGarrulax canorusto temperature by measuring their body temperature (Tb), metabolic rate (MR) and EWL at ambient temperatures (Ta) between 5 and 40 °C. Overall, we found that mean body temperature was 42.4 °C and average minimum thermal conductance (C) was 0.15 ml O2g−1h−1°C−1measured between 5 and 20 °C. The thermal neutral zone (TNZ) was 31.8–35.3 °C and BMR was 181.83 ml O2h−1. Below the lower critical temperature, MR increased linearly with decreasingTaaccording to the relationship: MR (ml O2h−1)=266.59–2.66Ta. AtTas above the upper critical temperature, MR increased withTaaccording to the relationship: MR (ml O2h−1)=−271.26+12.85Ta. EWL increased withTaaccording to the relationship: EWL (mg H2O h−1)=−19.16+12.64Taand exceeded metabolic water production atTa>14.0 °C. The highTband thermal conductance, low BMR, narrow TNZ, and high evaporative water production/metabolic water production (EWP/MWP) ratio in the Hwamei are consistent with the idea that this species is adapted to warm, mesic climates, where metabolic thermogenesis and water conservation are not strong selective pressures.
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