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14.4 Population and Growth Patterns Populations grow in predictable patterns and is always changing.

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Presentation on theme: "14.4 Population and Growth Patterns Populations grow in predictable patterns and is always changing."— Presentation transcript:

1 14.4 Population and Growth Patterns Populations grow in predictable patterns and is always changing.

2 14.4 Population and Growth Patterns Four factors affect the size of a population. –immigration –births –emigration –deaths

3 14.4 Population and Growth Patterns Population growth is based on available resources.

4 14.4 Population and Growth Patterns Exponential growth is a rapid population increase due to an abundance of resources. (J curve)

5 14.4 Population and Growth Patterns Logistic growth is due to a population facing limited resources. (S curve) Carrying capacity is the maximum number of individuals in a population that the environment can support.

6 14.4 Population and Growth Patterns A limiting factor is something that keeps the size of a population down.

7 14.4 Population and Growth Patterns Density-dependent limiting factors are affected by the number of individuals in a given area. –parasitism and disease –predation –competition

8 14.4 Population and Growth Patterns Density-independent limiting factors limit a population’s growth regardless of the density. –unusual weather –natural disasters –human activities


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