How did you estimate the number of daisies? Did you try to count them all? Or did you use another method? See if this will help…

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Presentation transcript:

How did you estimate the number of daisies? Did you try to count them all? Or did you use another method? See if this will help…

Using a grid like this helps you to estimate the number of plants in an area. But… If you were asked to count the number of daisies in a field, this would be impractical. Instead we use quadrats.

Random sampling

Stratified Random Sampling

Systematic sampling

Now let’s go try it! I luuuvvvs me some ecology!

STARTER: Calculate the percentage density of Plant A in the following experiment: QuadratSite 1Site Quadrat used 0.5m 25m 30m 25m Site 1 Site 2

Percentage Frequency Percentage of the total quadrat number that the species was present in. Percentage Cover (%)ACFOR ScaleScore >50Abundant Common Frequent3 6-12Occasional2 <6, or single individualRare1 absent

Now let’s go practice calculating percentage cover!! I luuuvvvs me some ecology!

Complete Q in your booklet