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Counting Populations

Counting Populations. By: Vera Colm Johw. Direct Observation. You count all the animals that are in the area. I counted every single fish in the fish tank. Indirect Observation. You count how many holes there are to determine how many organisms live there.

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Counting Populations

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  1. Counting Populations By: Vera Colm Johw

  2. Direct Observation • You count all the animals that are in the area. • I counted every single fish in the fish tank.

  3. Indirect Observation • You count how many holes there are to determine how many organisms live there. • I counted all the prairie dogs holes and got 128 prairie dogs.

  4. Sampling • Estimating approximately how many organisms you think there are. • I estimate that there are 10,000 deer in the Wasatch Mountiains.

  5. Mark and Recapture • Take organisms and mark them with something, then come back later, and check how many are marked an how many aren’t. • I found a couple of cows while trying to find out how many cows there are on my uncles ranch. I marked 5 with a red dot, then came back a week later and counted how many didn’t have red dots.

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