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Limits to Population GrowthPowerPoint Presentation

Limits to Population Growth

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## PowerPoint Slideshow about ' Limits to Population Growth' - vega

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Presentation Transcript

What slows the growth of populations?

- Limiting Factors
- Density-dependent limiting factors: limiting factors that are dependent on population size
- Density-independent limiting factors: limiting factors that affect the same percentage of a population regardless of its size.

Density-dependent limiting factors

- Food supply
- Predation
- Disease
- Related to competition and interactions between organisms.
- Greater effect in larger populations.

Density-dependent limiting factors

- Populations controlled by density-dependent factors show an S-shaped curve on a graph.
- Exponential growth at first, then growth slows and stops at the carrying capacity. p.81

Density-independent factors

- Natural disasters
- Hurricane
- Fire
- Tsunami
- Limit growth of population by destroying habitat.

Density-independent limiting factors

- Populations controlled by density-dependent factors show a boom and bust on a graph
- Exponential growth when conditions are favorable, then many die when conditions change.
- Thrips, aphids, and other
Insects (pg 127)

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