14.4 Population and Growth Patterns KEY CONCEPT Populations grow in predictable patterns.
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Transcript of 14.4 Population and Growth Patterns KEY CONCEPT Populations grow in predictable patterns.
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14.4 Population and Growth Patterns
KEY CONCEPT Populations grow in predictable patterns.
![Page 2: 14.4 Population and Growth Patterns KEY CONCEPT Populations grow in predictable patterns.](https://reader036.fdocuments.in/reader036/viewer/2022081515/5697bf861a28abf838c87fe3/html5/thumbnails/2.jpg)
14.4 Population and Growth Patterns
Changes in a population’s size are determined by immigration, births, emigration, and deaths.
• The size of a population is always changing.
• Four factors affect the size of a population.– immigration– births– emigration– deaths
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14.4 Population and Growth Patterns
Population growth is based on available resources.
• Exponential growth is a rapid population increase due to an abundance of resources.
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14.4 Population and Growth Patterns
• Logistic growth is due to a population facing limited resources.
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14.4 Population and Growth Patterns
• www.ibiblio.org/lunarbin/worldpop
• http://math.berkeley.edu/~galen/popclk.html
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14.4 Population and Growth Patterns
• Carrying capacity is the maximum number of individuals in a population that the environment can support.
• A population crash is a dramatic decline in the size of a population over a short period of time.
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14.4 Population and Growth Patterns
Ecological factors limit population growth.
• A limiting factor is something that keeps the size of a population down.
• Density-dependent limiting factors are affected by the number of individuals in a given area.
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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
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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