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Metabolism of living organisms is a foundation of life. The metabolic rate(energy production per unit time) increases slower than organisms' mass. Whenthis phenomenon is considered across different species, it is calledinterspecific allometric scaling, whose causes are unknown. We argue that thecause of interspecific allometric scaling is the total effect of physiologicaland adaptation mechanisms inherent to organisms composing a food chain.Together, the workings of these mechanisms are united by a primary goal of anyliving creature - its successful reproduction. This primary necessity of eachorganism and of the entire food chain is that common denominator, to which allorganisms adjust their metabolic rates. In this article, we considerunicellular organisms, while the second paper studies multicellular organismsand the entire concept in more detail. Here, using the proposed concepts andexperimentally verified growth models of five different unicellular organisms,we obtain close to experimental findings values of allometric exponents of0.757 for the end of growth and 0.853 for the beginning of growth. Theseresults comply with experimental observations and prove our theory that therequirement of successful reproduction within the food chain is an importantfactor shaping interspecific allometric scaling.

Interspecific allometric scaling of unicellular organisms as an evolutionary process of food chain creation