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Sampling Techniques and Presenting Data The Sequel

Sampling Techniques and Presenting Data The Sequel. Sampling techniques…. A 25cm² Quadrat. Point Quadrat Useful for estimating percentage cover Lower each of 10 needles The number that touch a species is proportional to % cover E.g. 9/10 touch grass =90%. Transect?. Belt transect?

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Sampling Techniques and Presenting Data The Sequel

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  1. Sampling Techniques and Presenting DataThe Sequel

  2. Sampling techniques… A 25cm² Quadrat Point Quadrat Useful for estimating percentage cover Lower each of 10 needles The number that touch a species is proportional to % cover E.g. 9/10 touch grass =90%

  3. Transect? • Belt transect? Interrupted / continuous • Line transect? • Point quadrat? • 50cm2 quadrat?

  4. How many quadrats do we need?Calculate the running mean.When the mean remains relatively stable this is the maximum required

  5. Another alternative is to do a pilot study which records when no additional species are being found.

  6. What size quadrat should we use to ensure each one provides a representative sample? A pilot study using different sized quadrats will help you decide A 25cm² quadrat would be appropriate here.

  7. Presenting data using kite diagrams

  8. Presenting data using kite diagrams This will illustrate distribution and abundance along a transect. The scale for each can be numbers, % cover or you can use ACFOR. Distance from the shore (m)

  9. Species % cover 100 80 60 40 20 0 20 40 60 80 100 1 2 3 4 5 6 7 8 Distance (m)

  10. Species % cover 100 80 60 40 20 0 20 40 60 80 100 1 2 3 4 5 6 7 8 Distance (m)

  11. Species % cover 100 80 60 40 20 0 20 40 60 80 100 1 2 3 4 5 6 7 8 Distance (m)

  12. Rocky Shore Survey Describe how you would survey a rocky shore to show distribution of seaweed from the upper to lower shore. What sampling method? How would you measure abundance of each type of seaweed present Using the data on the sheet present this data as kite diagrams

  13. Produce a kite diagram for these results

  14. Studying ecosystems; keywords • Quadrat • Transect • Abundance • Distribution • Percentage cover • Random/systematic • Cumulative frequency

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