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Measuring Populations

Carj , Orop , Zunc. Measuring Populations . Direct observation . A way to determine the size of a population by counting all of its members. Example: Counting cats one by one is an example of a direct observation. Indirect Observation.

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Measuring Populations

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  1. Carj, Orop, Zunc Measuring Populations

  2. Direct observation • A way to determine the size of a population by counting all of its members. • Example: Counting cats one by one is an example of a direct observation.

  3. Indirect Observation • A way to determine this is by counting their homes or things they leave behind. • Example: Counting the homes of prairie dogs would be an example of indirect observation because they leave holes in the ground.

  4. Sampling • Figure out by counting how many there is in a small area and multiplying the answer to find out the entire population. • Example: Counting birds in a tree and multiplying that number to find out how many birds there are in the whole area.

  5. Mark & Recapture • To take animals and study them and then return them to where they came from coming back some other time to see how many more there are. • Example: Taking worms and marking them and returning them but later coming back to see if there’s new ones.

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