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首页> 外文期刊>Journal of Theoretical Biology >Cutaneous heat flux models do not reliably predict metabolic rates of marine mammals
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Cutaneous heat flux models do not reliably predict metabolic rates of marine mammals

机译：皮肤热通量模型不能可靠地预测海洋哺乳动物的代谢率

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Heat flux models have been used to predict metabolic rates of marine mammals, generally by estimating conductive heat transfer through their blubber layer. Recently, Kvadsheim et al. (1997) found that such models tend to overestimate metabolic rates, and that such errors probably result from the asymmetrical distribution of blubber. This problem may be avoided if reliable estimates of heat flux through the skin of the animals are obtained by using models that combine calculations of conductive heat flux through the skin and fur, and convective heat flux from the surface of the animal to the environment. We evaluated this approach based on simultaneous measurements of metabolic rates and of input parameters necessary for heat flux calculations, as obtained from four harp seals (Phoca groenlandica) resting in cold water. Heat flux estimates were made using two free convection models (double-flat-plate and cylindrical geometry) and one forced convection model (single-flat-plate geometry). We found that heat flux estimates generally underestimated metabolic rates, on average by 26-58%, and that small variations in input parameters caused large variations in these estimates. We conclude that cutaneous heat flux models are too inaccurate and sensitive to small errors in input parameters to provide reliable estimates of metabolic rates of marine mammals. (C) 2000 Academic Press. [References: 16]
机译：热通量模型已被用于预测海洋哺乳动物的代谢速率，通常是通过估计通过其润滑脂层的传导热传递来进行的。最近，Kvadsheim等。 （1997年）发现这种模型往往高估了代谢率，并且这种错误可能是由于润滑脂的不对称分布造成的。如果通过使用结合了通过皮肤和毛皮的传导热通量的计算以及从动物表面到环境的对流热通量的计算模型来获得通过动物皮肤的热通量的可靠估计，则可以避免该问题。我们根据对代谢率和热通量计算所需的输入参数的同步测量来评估该方法，该方法是从四个竖琴海豹（Phoca groenlandica）放在冷水中获得的。使用两个自由对流模型（双平板和圆柱几何形状）和一个强制对流模型（单平板几何形状）进行热通量估算。我们发现，热通量估算值通常低估了新陈代谢率，平均降低了26-58％，并且输入参数的细微变化导致这些估算值的较大变化。我们得出的结论是，皮肤热通量模型过于不准确，并且对输入参数中的小错误非常敏感，无法提供可靠的海洋哺乳动物代谢率估计值。 （C）2000学术出版社。 [参考：16]

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