Estimating the energy expenditure of free-ranging polar bears using tri-axial accelerometers: A validation with doubly labeled water
Estimating the energy expenditure of free-ranging polar bears using tri-axial accelerometers: A validation with doubly labeled water
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DOI：
10.1002/ece3.5053
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发表时间：
2019-04-01
影响因子：
2.6
通讯作者：
Williams, Terrie M.
中科院分区：
文献类型：
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作者：
Pagano, Anthony M.;Williams, Terrie M.
能量消耗的测量可用于通知动物保护和管理，但测量自由放养动物的能量消耗的方法有各种局限性。生物记录技术的进步使得能够使用来自加速度计的动态身体加速度作为能量消耗的代理。虽然动态身体加速度已被证明与圈养动物的耗氧量密切相关，但只有少数几项关于自由放养动物的研究证实了这一点。在这里，我们使用氧气消耗和整体动态身体加速度之间的关系，在休息和行走的北极熊熊和出版的价值观，在北极熊游泳的成本估计的总能量消耗的6个自由放养的北极熊，主要使用海冰的博福特海。能量模型的基础上加速度进行了比较，来自双标记水的方法相同的个人的能量消耗模型。基于加速计的能量消耗估计平均预测总能量消耗比来自双标记水的估计少30%。然而，基于加速度计的能量消耗测量与来自双标记水的测量密切相关（r（2）= 0.70）。我们的研究结果强调了动态身体加速度作为总能量消耗指标的优势和局限性，同时也进一步支持其用作自由放养动物瞬时、详细能量消耗的代表。
Measures of energy expenditure can be used to inform animal conservation and management, but methods for measuring the energy expenditure of free-ranging animals have a variety of limitations. Advancements in biologging technologies have enabled the use of dynamic body acceleration derived from accelerometers as a proxy for energy expenditure. Although dynamic body acceleration has been shown to strongly correlate with oxygen consumption in captive animals, it has been validated in only a few studies on free-ranging animals. Here, we use relationships between oxygen consumption and overall dynamic body acceleration in resting and walking polar bears Ursus maritimus and published values for the costs of swimming in polar bears to estimate the total energy expenditure of 6 free-ranging polar bears that were primarily using the sea ice of the Beaufort Sea. Energetic models based on accelerometry were compared to models of energy expenditure on the same individuals derived from doubly labeled water methods. Accelerometer-based estimates of energy expenditure on average predicted total energy expenditure to be 30% less than estimates derived from doubly labeled water. Nevertheless, accelerometer-based measures of energy expenditure strongly correlated (r(2) = 0.70) with measures derived from doubly labeled water. Our findings highlight the strengths and limitations in dynamic body acceleration as a measure of total energy expenditure while also further supporting its use as a proxy for instantaneous, detailed energy expenditure in free-ranging animals.