4.3 explain how quadrats can be used to sample the distribution of organisms in their habitats.

1. A sample square is taken at random
2. The number of a population in that square is taken
3. This is repeated in different areas
4. Used to show where population is dense and where it is not

• Quadrats should be placed randomly so that a representative sample is taken
• You should look at results from several quadrats in the area – this reduces the effect of unusual distribution
• Results are more reliable as you look at more quadrat samples

Advertisements