Malthusian Relativityι**=7/3ψ
The bend of evolutionary time

Fast evolution the decelerating mass

The maximum body mass of terrestrial mammals evolve with time dilation and a downward bend

The maximum mass for trunked mammals evolved so fast that the increase in resource handling and/or resource availability outran the evolutionary increase in metabolic pace, with a rββ/rα-ratio of 0.1 and a dw/dt-exponent of 0.79 (Fig. 1). A rββ/rα-ratio of 0.1 is also found for the maximum mass across all species of terrestrial mammals (Witting, 2016).

Fig. 1 The lifespan (τ, left) and maximum body mass (w, middle) across trunked mammals, as estimated for data provided by Okie et al (2013). Trunked mammals have a dw/dt-exponent around 0.79 (right) that coincides with a rββ/rα-ratio that is close to zero, as predicted for fast body mass evolution during periods of evolutionary radiation. From Witting (2016).


  • Witting, L. 2016. The natural selection of metabolism bends body mass evolution in time. Preprint at bioRxiv