Download - Carrying Capacity
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Carrying Capacity
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Abiotic and Biotic Factors Work Together to Influence Population Size
• The growth of individuals and increase in size of populations is regulated by available resources.
• Resources are limited.• Competition for food or other
resources may take a toll on populations.
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• Environmental stress, such as heat or cold, will also limit population size.
• The greatest number of individuals that a space can support is called its carrying capacity.
• The carrying capacity determines the population’s maximum size.
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• Homeostasis is the tendency for a population to remain stable.
• Populations will remain between the upper and lower limits that are defined by mortality, birthrate, and population movements.
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Population Density May Fluctuate
• The interaction of the population’s growth rate with the environment determines the density of the surviving population.
• If you measure the density of a population at different times during the year, you will seldom find any two consecutive measurements that are the same.
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Populations May Spread to Neighboring Areas
• The ability of populations of living things to spread from a central place into others is called dispersal.
• This can be either active or passive.
• Organisms must be able to survive and reproduce in the new location.
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Barriers Can Prevent Dispersal• Most species have a limited
geographic range.• Physical barriers such as mountains
and water prevent dispersal.• An increase in a population of
organisms that can move encourages emigration to less populated areas that my have resources.