The exact amount of quadrats needed to examine the percent coverage of the coral species across the 18m2 covered during the transect of the reef depends on the size of the quadrats, assuming a size of one square meter, you will need 18 quadrats.
A quadrat is a square, commonly made of metal or wire, which is used to sample a specific area and measure the coverage of a certain species or thing in that area. Quadrats come in a variety of sizes, some common sizes are:
- 25x25 cm
- 50x50 cm
- 1x1 meter
The size used often varies in accordance with the species being studied.
As is the case for coral reefs, a common quadrat size to use is 1x1 meter (one square meter). Since the question states that the area being measured is a total of 18 square meters, we will need exactly 18 quadrats to complete the examination.
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