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Measuring Populations

This article explores various methods for estimating population sizes in ecology. It details direct observation, where individuals are counted directly (e.g., counting cats), and indirect observation, which infers population size by examining signs like burrows (e.g., prairie dogs). The sampling method is introduced, explaining how counting individuals in a small area can estimate the entire population size (e.g., birds in a tree). Additionally, the mark and recapture technique is discussed, illustrating how animals are marked, released, and recaptured to assess population changes over time (e.g., marked worms).

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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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