Torpor and Digestion in Food‐Storing Hibernators
Torpor and Digestion in Food‐Storing Hibernators
复制标题
储存食物的冬眠者的迟钝和消化
DOI：
--
复制
发表时间：
2001
影响因子：
1.6
通讯作者：
D. Kramer
中科院分区：
文献类型：
--
作者：
M. Humphries;Donald W. Thomas;D. Kramer
Many species of hibernating mammals rely on hoarded food rather than body fat to support winter energy requirements. Here, we evaluate whether the associated ingestive and digestive requirements reduce the benefits that food‐storing hibernators can accrue from torpor. Using a simple model, we predict (1) that digestive efficiency could either increase or decrease with increased use of torpor, depending on the Q10 of digestion relative to the Q10 of whole‐animal metabolism and (2) that increased torpor will result in a linear decrease in energy consumption but an exponential increase in euthermic intake requirements. In 16 captive eastern chipmunks (Tamias striatus), the proportion of time that different individuals spent in torpor was highly variable (
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$$29.8\% \pm 5.9\% $$
\end{document} ; 0.0%–86.3%), positively correlated with dry matter digestibility (
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$$r^{2}=0.53$$
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$$P=0.02$$
\end{document} ) and negatively correlated with energy consumption (
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$$r^{2}=0.72$$
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$$P=0.002$$
\end{document} ). Thus, by both increasing conversion efficiency and reducing energy requirements, torpor appears to provide a double benefit for energy conservation by food‐storing hibernators. Despite this, a comparative analysis shows that the euthermic intervals of food‐storing rodents are four times as long and torpor intervals are half as long as that of fat‐storing rodents. Given that required euthermic intake rates are expected to increase exponentially at high levels of torpor, the reduced torpor expression of food‐storing species may result from constraints on their ability to load enough food into the gut when euthermic to cover the energy requirements of the subsequent torpor cycle.
Many species of hibernating mammals rely on hoarded food rather than body fat to support winter energy requirements. Here, we evaluate whether the associated ingestive and digestive requirements reduce the benefits that food‐storing hibernators can accrue from torpor. Using a simple model, we predict (1) that digestive efficiency could either increase or decrease with increased use of torpor, depending on the Q10 of digestion relative to the Q10 of whole‐animal metabolism and (2) that increased torpor will result in a linear decrease in energy consumption but an exponential increase in euthermic intake requirements. In 16 captive eastern chipmunks (Tamias striatus), the proportion of time that different individuals spent in torpor was highly variable (
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$$29.8\% \pm 5.9\% $$
\end{document} ; 0.0%–86.3%), positively correlated with dry matter digestibility (
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$$r^{2}=0.53$$
\end{document} ,
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$$P=0.02$$
\end{document} ) and negatively correlated with energy consumption (
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$$r^{2}=0.72$$
\end{document} ,
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$$P=0.002$$
\end{document} ). Thus, by both increasing conversion efficiency and reducing energy requirements, torpor appears to provide a double benefit for energy conservation by food‐storing hibernators. Despite this, a comparative analysis shows that the euthermic intervals of food‐storing rodents are four times as long and torpor intervals are half as long as that of fat‐storing rodents. Given that required euthermic intake rates are expected to increase exponentially at high levels of torpor, the reduced torpor expression of food‐storing species may result from constraints on their ability to load enough food into the gut when euthermic to cover the energy requirements of the subsequent torpor cycle.
影响因子：
--
作者：
CAREY, HV
通讯作者：
CAREY, HV
蛇肠响应进食而快速上调：肠道适应的新模型。
DOI：
10.1152/ajpgi.1994.266.4.g695
发表时间：
1994
期刊：
The American journal of physiology
影响因子：
--
作者：
Secor,SM;Stein,ED;Diamond,J
通讯作者：
Diamond,J