  The entanglement of population dynamics, evolution, and adaptive radiation
for species competing for resources is studied. For resource harvesting, we
modify the model used in Ref. Phys. Rev. Lett. 118 048103 and introduce new
resource contest principles. We realistically implement the effects of
beneficial and deleterious mutations on the coefficients in the equations
governing the population dynamics and consider the emergence of reproductive
isolation. The proposed model is shown to be in agreement with the competitive
exclusion principle and no vacant niche principle. We establish a mechanism
that contributes to preventing the accumulation of irreversible deleterious
mutations: competition between recently diverged species/subpopulations. The
proposed model is applicable for descriptions of more complex systems. In case
of many constants in time resources, one observes very rapid specialization, a
feature not reproducible by the common model.
