Transects and Measuring Distribution Flashcards

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What is a transect in ecology work?

A transect is a straight line across a habitat along which you take samples.

What does the distribution of a species mean?

Distribution means where a species is found across an area or habitat.

Why would you use a transect instead of random quadrats?

You use a transect when you want to see how the distribution of organisms changes across a habitat. For example, from a path into a woodland or from the top to the bottom of a shore.

How do you set up a simple transect using a tape measure?

Stretch a tape measure in a straight line across the area you want to study. Fix it at the start and end and note the distance along the tape for each sample point.

What is meant by systematic sampling along a transect?

Systematic sampling means taking samples at regular distances along the transect, such as every 1 metre.

How do you use quadrats along a transect to measure plant distribution?

Place a quadrat at each chosen point on the transect. Count the number of each plant species or estimate percentage cover and record the results in a table.

What is the difference between a line transect and a belt transect?

In a line transect you record the species that touch the line at set points. In a belt transect you place quadrats next to each other along the line to sample a strip of habitat.

What is a sampling interval on a transect?

The sampling interval is the distance between each sample point on the transect, for example every 0.5 metres or every 2 metres.

How can you use transect data to show changes in distribution?

You can draw a graph or chart, such as a bar chart. Put distance along the transect on the x-axis and number or percentage cover of each species on the y-axis.

Give one example of when a transect could be used in a school field study.

You could lay a transect from a paved path into a grassy field to see how the types and amounts of plants change with distance from the path.

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