# Ecosystems 6

Year 10 Topic 2 – Learning Opportunity 6: Belt transects.
This learning opportunity has 6 tasks to complete.
Target time: 50 minutes.

By the end of this learning opportunity you will be able to: explain how to determine the number of organisms in a given area using raw data from field-work techniques, including quadrats and belt transects.

Key words: quadrat, sample, estimate, random, belt transect.

Task 1: A belt transect can be used to investigate the relationship between organisms and their environment. Write out the steps for using a quadrat into the correct order. Watch the video to help you.

• Measure the area of the field and the quadrat
• Place a quadrat next to the measuring tape at regular intervals
• Also measure a value for environmental factors e.g. light intensity
• Count all of the organisms inside of the quadrat
• Lay out a measuring tape between two areas
• Record the number of organisms and value for the environmental factor

Find the answers at the end of the blog.

Task 2: Copy the table and use the diagram of a belt transect to complete it by counting the number of clover.

Find the answer at the end of the blog.

Task 3: Identify any anomalous results in your results table by circling them.

Find the answer at the end of the blog.

Task 4: Describe the pattern shown in the table and suggest an explanation for this pattern.

As you move closer to the tree… (what happens to the number of clover?)
This could be explained by…

Find the answer at the end of the blog.

1. Lay out a measuring tape between two areas
2. Place a quadrat next to the measuring tape at regular intervals
3. Count all of the organisms inside of the quadrat
4. Record the number of organisms
5. Also measure and record a value for environmental factors e.g. light intensity

As you move towards the tree… the less clover there are.
This could be explained by… there being less light available as the tree blocks it/causes shade, so less light is available for photosynthesis and less clover grow. Also, closer to the tree there would be competition for resources such as water and nutrients, so less clover would be able to grow.