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Measuring Populations

This text explores various methods for measuring animal populations, highlighting direct and indirect observation alongside sampling techniques. Direct observation involves counting animals that are visibly seen, as done at a pet store with cats. Conversely, indirect observation requires estimating numbers based on evidence like gopher holes. Additionally, sampling methods are discussed, such as counting grains of sand in a limited area to estimate a larger quantity. The mark and recapture technique is also explained, demonstrating how animals can be caught, marked, and later recaptured to study population dynamics.

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Measuring Populations

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  1. Milz, Merp, Sint Measuring Populations

  2. Direct Observation • Direct observation is when you actually see the animal and count all of them • We went to the pet store and counted all the cats

  3. Indirect Observation • Indirect observation is when you see the holes from gophers and guess how many there are. • We went to Tanner’s front yard and we counted all the gophers holes and guess how many there was from the holes

  4. Sampling Sampling is whenyou count the amount if something in a selected area and estimate how many more of the whatever you are counting We went to the desert and counted the grains of sand that were in an area that was 1 foot around

  5. Mark and Recapture • When you catch a lot of animals and then you mark them then set them free then you go out and catch them again and see how many have marks • We caught 10 mice marked them with a black dot then 3 weeks later went and caught them again and there was 10 mice with dots 5 dots left

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