A 15-m2 wooded area has the following: 30 ferns, 150 grass plants, and 6 oak trees. What is the population density per m2 of each of the above species?

How to solve: divide the number of specimen over the total area they take over. Then, divide both denominator and numerator by the total area.

1. Ferns: 30 ferns/15 m² - -> divide by 15 to both - -> 2 ferns/m²

2. Grass plants: 150 grass/15 m² - -> divide by 15 to both - -> 10 grass/m²

3. Oak trees: 6 tree/15 m² - -> divide by 15 to both - -> 0.4 tree/m²