10 (7).ppt - Population Changes To study populations assess 1 Population size 2 Population density 3 Dispersion of organisms Is the total number of

10 (7).ppt - Population Changes To study populations assess...

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Population Changes
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To study populations assess: 1. Population size 2. Population density 3. Dispersion of organisms
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Is the total number of individuals of a specific species occupying a given area or volume at a given time.
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It is always changing The numbers can have a huge impact on other organisms It can be determined 2 ways: 1. A total count 2. Representative Sampling
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Is used when the population is small
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Is used for large populations (sample a small area and multiply by total area) it assumes that population is distributed randomly Must include number of organisms, location and time
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Refers to the number of organisms there are in a given area or volume
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Local density may vary within a population’s geographic range Small organisms have higher population densities
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Population density can be deceiving because: 1. It does not tell you about density changes 2. some of the organism’s habitat may be unusable … affecting their distribution
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