Question

The abundance of birds and other predators of borer beetles depends on how much natural forest is left within and around the coffee plantations. what is the approximate percentage increase in borer predators per hectare if forest cover is doubled from 15 to 30 percent?

Answer 1

The graph below presents the number of borer beetles per hectare in relation to the size of the forest cover.
As we can see, the number of borer beetles increases with the percentage of forest cover. At 15% of the forest cover the number of beetles is around 4 per hectare and at 30% it would be around 11, showing a 275% increase in number.