Learning Objectives

10.1.1 List the different patterns of population growth observed in nature.

10.1.2 Compare the patterns of exponential growth with that of logistic growth.

10.1.3 Describe population size fluctuations and the special case of population cycling.

Most observed patterns of population growth can be grouped into four major types: exponential growth, logistic growth, population fluctuations, and regular population cycles (a special type of fluctuation). Bear in mind, however, that a single population could (and probably will) experience each of these four types of growth at different times. For example, as we will see shortly, a population may grow logistically yet fluctuate around the values expected in logistic growth.