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Measuring populations

Measuring populations. BY: Durh, Hutr, Pars. Direct observation. Counting each organism in a population. Ex: We counted all the tomato plants in the garden. Indirect Observation. Counting the signs of the population. Ex: We counted all of the prairie dog holes. Sampling.

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Measuring populations

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  1. Measuring populations BY: Durh, Hutr, Pars

  2. Direct observation Counting each organism in a population. Ex: We counted all the tomato plants in the garden.

  3. Indirect Observation Counting the signs of the population. Ex: We counted all of the prairie dog holes.

  4. Sampling Counting the number in a small area then estimating the big area. Ex: We counted how many fish were in a small part of the pond then estimated the number in the whole pond.

  5. Mark-and-recapture Capturing a few of one species marking them then come back and see how many are marked there Ex: We captured a few birds marked them then waited for more to come back and counted the ones with marks.

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