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
To study populations assess: 1. Population size 2. Population density 3. Dispersion of organisms
Is the total number of individuals of a specific species occupying a given area or volume at a given time.
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
Is used when the population is small
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
Refers to the number of organisms there are in a given area or volume
Local density may vary within a population’s geographic range Small organisms have higher population densities
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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