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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 on theme: "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…"— Presentation transcript:

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2 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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4 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.

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6 Random sampling

7 Stratified Random Sampling

8 Systematic sampling

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

11 STARTER: Calculate the percentage density of Plant A in the following experiment: QuadratSite 1Site 2 11215 2239 3035 4928 52716 Quadrat used 0.5m 25m 30m 25m Site 1 Site 2

12 Percentage Frequency Percentage of the total quadrat number that the species was present in. Percentage Cover (%)ACFOR ScaleScore >50Abundant5 25-50Common4 12-25Frequent3 6-12Occasional2 <6, or single individualRare1 absent

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

14 Complete Q 11-13 in your booklet

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