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Estimating Population Sizes Using Random Sampling and Quadrats

This document explores the methods of estimating population sizes in ecological studies, focusing on random sampling techniques and the use of quadrats. A population is defined as a group of the same species living within a specific area. Since counting every organism is impractical, ecologists employ random sampling methods where individuals have an equal chance of selection. Quadrat sampling allows for effective population measurements in uniform areas, while also accommodating irregularly shaped landscapes through combined techniques. Our study involves analyzing the population sizes of red clover and dandelions.

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Estimating Population Sizes Using Random Sampling and Quadrats

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  1. Investigation 1- IB2 Random sampling and Quadrats (G.1.3)

  2. Population • A group of organisms of the same species living in the same area at the same time

  3. Measuring Populations • It is usually impossible to count every member of a population • Ecologists often use methods to estimate the population size

  4. Random Sampling • A sample, or part of an area, is chosen to illustrate what the whole population is like • In a random sample, every individual has an equal chance of being selected • Small numbers of individuals, in randomly located parts of the total area, are counted • This method is suitable for organisms that do not move around!

  5. Random Sampling – Quadrats • Square sample areas of equal size, marked out by a frame • Useful when study area is uniform • When study area is sloped or irregularly shaped, quadrat can be used together with a line transect (which we did in grade 10)

  6. Our study is in the quad… analyzing red clover and dandelion population sizes..

  7. Random sample generating using your TI-83 • Stat • Edit • L1 Highlighted • Green / + sign • MATH • PRB • 5- Random Integer • (1,5,10) L1 • (1, 10, 10) L2 • Green • + • Enter • * Do the same for L2 to get your co-ordinates.

  8. Calculating population • Population size= mean number per quadrat * total area / area of each quadrat • Page 152 leaf book

  9. After the population size has been determined of each you can conclude whether you or not you think pesticides are used or not on the school grounds… • How can we be sure?

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