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Measuring Populations. 4 ways to tell if it is a population. By: Pett and Braj. Direct Observation…. Counting organisms one by one. Example: I went to the forest to count how many wolfs there are. Indirect Observation…. Counting signs left by the organisms. Example:

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measuring populations

Measuring Populations

4 ways to tell if it is a population.

By: Pett and Braj

direct observation
Direct Observation…

Counting organisms one by one.

Example:

I went to the forest to count how many wolfs there are.

indirect observation
Indirect Observation…

Counting signs left by the organisms.

Example:

I went behind my how to count how many bee nests there were.

sampling
Sampling…

An estimate of how many organisms are in a area.

Example:

I went to the forest and counted 25 slugs on a big rock in one area here were 3 rocks total so I multiplied 25 by 3 and I estimated around 75 slugs total in the entire area.

mark and recapture
Mark and Recapture…

Capturing animals marking them then releasing back into the wild then returning later to capture them again and record info.

Example:

I went to the sea and caught a seal. I marked it by tagging its ear then I released it back into the water. I came back 3 months later and recorded the information.