Sand-dune Ecosystem - it is made up of a number of populations which form the community and the habitat
The fence line running in the middle splits the sand-dune area into: GRAZED and UN-GRAZED by cattle. Therefore, there are two different areas within an ecosystem.
How to study the populations in the different sides: Count the number of individuals in the population.
Quadrating - when you separate land into squares using metal, wood and string (From 0.25m x 0.25m up to 1m x 1m)
It is used to sample the area and count the number of individuals inside the grid. This will be repeated a number of times = Estimate of the population size
"Quadates are a method of sampling different locations so that populations can be compared in the two different locations"
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