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Understanding Population Measurement Techniques: Direct Observation, Indirect Observation, and Sampling

This resource explores various methods of measuring populations in ecological studies. It covers direct observation, where animals such as turtles are counted individually. Indirect observation involves estimating populations based on environmental indicators, like counting bee hives to estimate bee populations. The sampling technique entails counting members in a smaller area to extrapolate to a larger one, such as estimating city populations. Additionally, mark and recapture methods are discussed, involving tagging animals to estimate population sizes through subsequent recapture efforts.

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Understanding Population Measurement Techniques: Direct Observation, Indirect Observation, and Sampling

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  1. Measuring Populations By Austin, Alfonso and Anthony

  2. Direct Observation Counting all the members of an area one by one is called direct observation. We went to the beach and counted all the turtles one by one.That is a direct observation.

  3. Indirect Observation • Counting the things around a species environment is indirect observation. • We counted bee hives and multiplied by the amount of bee’s in each hive to show how many bee’s were in the area.

  4. Sampling • You count the number of members in a small area then multiply the number to get a larger area estimate. • We counted the number of people in one block then multiplied it by the number of blocks in the city to show the number of people in the city.

  5. Mark and Recapture Mark and Recapture is when people capture a group of animals and tag them then release them and then later they recapture them and count how many have tags on them. We captured a bunch of fish and then marked them and then recaptured them later and then we did a mathematical formula to find how many fish were in the river.

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