Slope of the Monod equation as an indicator of advantage in nutrient competition

Abstract

Apparently by analogy with enzyme kinetics, the half-saturation value (K) for nutrient uptake or growth has frequently been overemphasized in discussions of competition, and the role of maximum rates (Rm) has not been given sufficient emphasis. The ratio Rm/K, which is the slope of the Monod equation at lowest substrate concentration, offers a simple way of emphasizing both factors. Several examples from the literature are cited to show that this ratio better reflects rates at lowest concentrations, and therefore competitive position in the process being considered, than do K values alone.