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Counting Populations

This guide explores various methods for estimating animal populations, including direct and indirect observation techniques, sampling, and mark and recapture. Direct observation involves counting all visible organisms, such as counting every fish in a tank. Indirect observation uses indicators like holes to estimate population sizes, as demonstrated with prairie dogs. Sampling provides estimations for larger populations, like deer in the Wasatch Mountains. The mark and recapture method allows researchers to track individual animals to gain insights into population dynamics and movement.

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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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