Estimating Population Sizes (B4)
- Created by: Toni Pringle
- Created on: 20-01-13 12:43
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- Estimating Population Sizes (B4)
- Population
- All the organisms of one species in a habitat
- Populations of a different species in a habitat make up a comunity
- Estimate by scaling up from a small sample area
- Quadrat
- Square frame used to study a small area within frame and scale up findings to make estimates
- Quadrat
- Estimate by using Capture-Recapture
- 1) Capture a sample of the population + mark the animals in a harmless way
- 2) Release them back into the environment
- 3) Recapture another sample of the population. count how many of this sample are marked.
- 4) Estimate population size by using this equation=
- Population size= (number in first sample x number in second sample) / number in second sample previously marked
- Important points about these methods
- 1) The sample size affects the accuracy of the estimate- bigger sample, the more accurate
- 2) when using capture-recapture, you have to assume the following things-
- There have been no changes to population sizes due to deaths, immigration or emigration
- The marking hasn't affected the chances of survival
- The sampling methods for the capture and recapture were identical (traps in same place ect)
- Population
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