10 (2).ppt - Population Changes Is also caused by environmental factors These factors can be Number of births deaths Migration(gene flow Limiting

10 (2).ppt - Population Changes Is also caused by...

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Population Changes
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Is also caused by environmental factors
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These factors can be: Number of births & deaths Migration (gene flow) Limiting factors Density dependent factors Density independent factors
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have an increased effect on a population as population density increases.
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it limits population growth
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It creates an environment where selection favours those who can survive with few resources
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Examples: 1. Competition 2. Territoriality 3. Disease 4. Predation 5. Toxic Waste 6. Intrinsic Factors
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It is often over resources or habit It can be: A. Intraspecific B. Interspecific
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Is competition between members of the same species It may be for: a mate shelter nesting site resources
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Is competition for resources between 2 or more different species It can harm an organism
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It can be reduced by: I)resource partitioning II)having a different niche
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I)Resource partitioning: The resource is divided up
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II) Niche: Organisms change the location it occupies, when it is active ,or when it hunts
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