how many daisies?
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How many daisies?. 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… - PowerPoint PPT PresentationTRANSCRIPT
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:
Quadrat Site 1 Site 2
1 12 15
2 23 9
3 0 35
4 9 28
5 27 16
Quadrat used
0.5m
0.5m
25m 25m
30m25m
Site 1Site 2
Percentage Frequency
• Percentage of the total quadrat number that the species was present in.
Percentage Cover (%) ACFOR Scale Score
>50 Abundant 5
25-50 Common 4
12-25 Frequent 3
6-12 Occasional 2
<6, or single individual Rare 1
absent
Now let’s go practice calculating percentage cover!!
I luuuvvvs me some ecology!
Complete Q 11-13 in your booklet