The paradox of energy equivalence
The paradox of energy equivalence
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DOI：
10.1111/j.1466-8238.2012.00782.x
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发表时间：
2013-01-01
影响因子：
6.4
通讯作者：
Carbone, Chris
中科院分区：
文献类型：
--
作者：
Isaac, Nick J. B.;Storch, David;Carbone, Chris
能量当量是指种群能量通量与体重无关的概念，已成为生态学中的一个重要概念。我们认为，能量等效不是一个生态规则，声称，但一个有缺陷的概念，循环推理困扰。事实上，质量和能量通量的独立性是一个零假设。我们表明，我们的机械理解sizedensity关系（SDR）直接从这个零模型和假设，能量限制丰度。奇怪的是，如果没有这一假设，能源当量就没有意义，我们也就缺乏对特别提款权的机械理解。我们推导出的空模型下，特别提款权的强度（r 2）的表达式，它提供了一个框架内比较公布的特别提款权。这证实了质量和丰度之间的紧密相关性是所考虑的身体质量跨度的一个微不足道的结果。我们的模型表明，能量通量在大小相似的哺乳动物中变化了5到6个数量级，而在鸟类中变化的程度要大得多。我们的结论是，充满活力的范式可以加强考虑替代，非充满活力的假设。
Energy equivalence, the notion that population energy flux is independent of body mass, has become a key concept in ecology. We argue that energy equivalence is not an ecological rule, as claimed, but a flawed concept beset by circular reasoning. In fact, the independence of mass and energy flux is a null hypothesis. We show that our mechanistic understanding of sizedensity relationships (SDRs) follows directly from this null model and the assumption that energy limits abundance. Paradoxically, without this assumption energy equivalence has no meaning and we lack a mechanistic understanding for SDRs. We derive an expression for the strength (r 2) of SDRs under the null model, which provides a framework within which to compare published SDRs. This confirms that tight correlations between mass and abundance are a trivial consequence of the span of body masses considered. Our model implies that energy flux varies by five to six orders of magnitude among similarly sized mammals and to a far greater extent in birds. We conclude that the energetic paradigm can be strengthened by considering alternative, non-energetic, hypotheses.