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- W1985453075 abstract "Field studies of use of torpor by heterothermic endotherms suffer from the lack of a standardized threshold differentiating torpid body temperatures (Tb) from normothermic Tb's. This threshold can be more readily observed if metabolic rate (MR) is measured in the laboratory. I digitized figures from the literature that depicted simultaneous traces of MR and Tb from 32 respirometry runs for 14 mammal species. For each graph, I quantified the Tb measured when MR first began to drop at the onset of torpor (Tb‐onset). I used a general linear model to quantify the effect of ambient temperature (Ta) and body mass (BM) on Tb‐onset. For species lighter than 70 g, the model was highly significant and was described by the equation $$T_{mathrm{b},- mathrm{onset},}=( 0.055pm 0.014) mathrm{BM},+( 0.071pm 0.031) T_{mathrm{a},}+( 31.823pm 0.740) $$. To be conservative, I recommend use of these model parameters minus 1 standard error, which modifies the equation to $$T_{mathrm{b},- mathrm{onset},}-1,mathrm{SE},=( 0.041) mathrm{BM},+( 0.040) T_{mathrm{a},}+31.083$$. This approach provides a standardized threshold for differentiating torpor from normothermia that is based on use of energy, the actual currency of interest for studies of torpor in the wild. Few laboratory studies have presented the time‐course data required to quantify Tb‐onset, so more data are needed to validate this relationship." @default.
- W1985453075 created "2016-06-24" @default.
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- W1985453075 date "2007-11-01" @default.
- W1985453075 modified "2023-10-02" @default.
- W1985453075 title "An Energy‐Based Body Temperature Threshold between Torpor and Normothermia for Small Mammals" @default.
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- W1985453075 doi "https://doi.org/10.1086/521085" @default.
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