Warming reduces metabolic rate in marine snails: adaptation to fluctuating high temperatures challenges the metabolic theory of ecology
Warming reduces metabolic rate in marine snails: adaptation to fluctuating high temperatures challenges the metabolic theory of ecology
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DOI：
10.1098/rspb.2010.1414
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发表时间：
2011-01-22
影响因子：
4.7
通讯作者：
McQuaid, Christopher D.
中科院分区：
文献类型：
--
作者：
Marshall, David J.;McQuaid, Christopher D.
代谢生态学理论（MTE）的普适温度依赖模型（UTD）提出，温度根据物理学第一原理（玻尔兹曼动力学）控制质量尺度的、整个动物的静息代谢率。围绕该模型的代谢机制基础的含义，排除了适应性调节的影响，目前还不清楚这将如何适用于生活在边缘环境中的生物体，通常表现出相当大的代谢适应性。我们探讨了代谢的热缩放在岩石海岸eulittoral-fringe蜗牛（Echinolittorina malaccana）的经验，限制能量增益和波动的高温（25摄氏度和约50摄氏度之间）在长时间的再现（周）。与UTD模型的预测相反，在良性范围（30-40摄氏度）内，代谢率通常与温度呈负相关，这种关系取决于（i）温度范围，（ii）代谢抑制的程度（与静止期有关），以及（iii）蜗牛是否在壳内被隔离。表观活化能（E）在0.05和-0.43 eV之间变化，过度偏离UTD预测的0.6和0.7 eV之间的范围。当加热时新陈代谢的降低应该改善高温环境中的能量守恒，并挑战理论的普遍性及其机械基础。
The universal temperature-dependence model (UTD) of the metabolic theory of ecology (MTE) proposes that temperature controls mass-scaled, whole-animal resting metabolic rate according to the first principles of physics (Boltzmann kinetics). Controversy surrounds the model's implication of a mechanistic basis for metabolism that excludes the effects of adaptive regulation, and it is unclear how this would apply to organisms that live in fringe environments and typically show considerable metabolic adaptation. We explored thermal scaling of metabolism in a rocky-shore eulittoral-fringe snail (Echinolittorina malaccana) that experiences constrained energy gain and fluctuating high temperatures (between 25 degrees C and approximately 50 degrees C) during prolonged emersion (weeks). In contrast to the prediction of the UTD model, metabolic rate was often negatively related to temperature over a benign range (30-40 degrees C), the relationship depending on (i) the temperature range, (ii) the degree of metabolic depression (related to the quiescent period), and (iii) whether snails were isolated within their shells. Apparent activation energies (E) varied between 0.05 and -0.43 eV, deviating excessively from the UTD's predicted range of between 0.6 and 0.7 eV. The lowering of metabolism when heated should improve energy conservation in a high-temperature environment and challenges both the theory's generality and its mechanistic basis.