Exponential or Geometric Population Growth Models A. Assumptions Population growth in an unlimited, constant, and favorable environment.
Growth rates are constant.
C. Discrete Generations with a Single Breeding Period. Ro varies with age at reproduction, litter size, and survival, thus affecting N g . Where a species has been greatly depressed by human activities and such activities cease. Where a species naturally undergoes marked fluctuations and population growth consequently begins from densities that are very low relative to environmental carrying capacity. One common problem in calculating survival rates is to convert observed rates to a standardized time base.