Thermodynamic and metabolic effects on the scaling of production and population energy use
Thermodynamic and metabolic effects on the scaling of production and population energy use
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DOI：
10.1046/j.1461-0248.2003.00526.x
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发表时间：
2003-11-01
期刊：
影响因子：
8.8
通讯作者：
Tiffney, B
中科院分区：
文献类型：
--
作者：
Ernest, SKM;Enquist, BJ;Tiffney, B
生态系统的特性在一定程度上是由个体生物体的特性决定的。这些个体特征如何扩展以影响生态系统水平的过程目前尚不清楚。由于新陈代谢是许多个体和群体层面变量背后的基本过程，它提供了一种将个人特征与大规模过程联系起来的机制。在这里，我们使用新陈代谢和生态系统热力学来衡量从生理学到个体生物质生产和种群水平的能源使用。在从单细胞生物到哺乳动物和维管植物的各种好氧真核生物中，经温度校正的个体水平生物量生产速率显示出相同的体型依赖关系。哺乳动物和植物种群水平的能量利用都受到新陈代谢和营养水平之间能量交换的热力学约束的强烈影响。我们的结果表明，由于新陈代谢是生物体的一个基本特征，它不仅在个体和生态系统层面的过程之间提供了联系，而且还可以突出其他制约生态结构和动态的重要因素。
Ecosystem properties result in part from the characteristics of individual organisms. How these individual traits scale to impact ecosystem-level processes is currently unclear. Because metabolism is a fundamental process underlying many individual- and population-level variables, it provides a mechanism for linking individual characteristics with large-scale processes. Here we use metabolism and ecosystem thermodynamics to scale from physiology to individual biomass production and population-level energy use. Temperature-corrected rates of individual-level biomass production show the same body-size dependence across a wide range of aerobic eukaryotes, from unicellular organisms to mammals and vascular plants. Population-level energy use for both, mammals and plants are strongly influenced by both metabolism and thermodynamic constraints on energy exchange between trophic levels. Our results show that because metabolism is a fundamental trait of organisms, it not only provides a link between individual- and ecosystem-level processes, but can also highlight other import-ant factors constraining ecological structure and dynamics.