Mauritsson Karl, Jonsson Tomas
Ecological Modelling Group, School of Bioscience, University of Skövde, Skövde, Sweden.
Ecological and Environmental Modeling, Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden.
Sci Rep. 2023 Oct 5;13(1):16751. doi: 10.1038/s41598-023-43743-1.
Metabolic theories in ecology interpret ecological patterns at different levels through the lens of metabolism, typically applying allometric scaling to describe energy use. This requires a sound theory for individual metabolism. Common mechanistic growth models, such as 'von Bertalanffy', 'dynamic energy budgets' and the 'ontogenetic growth model' lack some potentially important aspects, especially regarding regulation of somatic maintenance. We develop a model for ontogenetic growth of animals, applicable to ad libitum and food limited conditions, based on an energy balance that expresses growth as the net result of assimilation and metabolic costs for maintenance, feeding and food processing. The most important contribution is the division of maintenance into a 'non-negotiable' and a 'negotiable' part, potentially resulting in hyperallometric scaling of maintenance and downregulated maintenance under food restriction. The model can also account for effects of body composition and type of growth at the cellular level. Common mechanistic growth models often fail to fully capture growth of insects. However, our model was able to capture empirical growth patterns observed in house crickets.
生态学中的代谢理论通过代谢的视角来解释不同层面的生态模式，通常运用异速生长比例关系来描述能量利用。这需要一个完善的个体代谢理论。常见的机械生长模型，如“冯·贝塔朗菲模型”“动态能量收支模型”和“个体发育生长模型”，缺少一些潜在的重要方面，尤其是在体细胞维持的调控方面。我们基于一种能量平衡建立了一个适用于自由采食和食物受限条件下动物个体发育生长的模型，该能量平衡将生长表述为同化作用以及维持、摄食和食物处理的代谢成本的净结果。最重要的贡献在于将维持分为“不可协商”部分和“可协商”部分，这可能导致维持的超异速生长比例关系以及在食物限制下维持的下调。该模型还能够解释细胞层面身体组成和生长类型的影响。常见的机械生长模型往往无法充分捕捉昆虫的生长情况。然而，我们的模型能够捕捉到家蟋蟀中观察到的实证生长模式。
