Population Spacing Describes how individuals arrange themselves within a population.

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Presentation transcript:

Population Spacing Describes how individuals arrange themselves within a population.

Growth, Stability and Decline

Population Size The number of individuals in a population at a given time. Methods of determining population size: Direct Observation Indirect Observation Sampling Mark and Recapture Studies

Direct Observation Counting one by one to determine the population. Christmas Island Crabs

Indirect Observation Observe signs of organisms rather than the organisms themselves. Cliff Swallows

Sampling Count the number of organisms in a small area and then multiply to find the number in the larger area.

Mark and Recapture Study Total Population = # marked x # recaptured # recaptured with marks Sea Turtles

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