(5) Population growth

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Explain reasons for the exponential growth phase, the plateau phase and the transitional phase between these two phases. 

Below is a sigmoid shaped growth curve that represents population growth

This model shows the changes in population size over time. 

Show below is an example of what happens when a population is expanding into a habitat offering initial low resistance or low limiting factors. 

(http://click4biology.info/c4b/5/images/5.3/logistics.gif) 

a) Exponential phase - there is unlimited grwoth of the population due to the absence of limiting factors. The rate of natality + immigration is greater than mortality

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