Logistic growth is when the growth rate of a population decreases as the number of its members increases. It occurs when an environment has limited resources. Population expansion decreases as resources become scarce and... More »

A logistic growth curve is a sigmoidal, or S-shaped, curve used to map functions of initially gradual increase, rapid increase in the middle growth period and a slow leveling off to a maximum value at the end. Typically,... More »

The basic equation for calculating population growth multiplies the population size by the per capita growth rate, which is calculated by subtracting the per capita death rate from the per capita birth rate. This simplis... More »

Calculate population growth rate by dividing the change in population by the initial population, multiplying it by 100, and then dividing it by the number of years over which that change took place. The number is express... More »

A direct relationship graph is a graph where one variable either increases or decreases along with the other. The general equation for a direct relationship graph is y = mx + b, where "y" denotes the dependent variable, ... More »

A density-dependent factor is a limiting factor that depends on the population size. These factors are only effective when the population reaches a certain density. Examples of density-dependent factors include competiti... More »

A logistic growth curve is a sigmoidal, or S-shaped, curve used to map functions of initially gradual increase, rapid increase in the middle growth period and a slow leveling off to a maximum value at the end. Typically,... More »