As stem density increases from about 35,000 stems to about 55,000 stems per hectare, what is the increase in snowshoe hare density?

To determine the increase in snowshoe hare density we simply subtract the initial density (in stems / hectare) to the final stem density. That is,

increase = final density - initial density

Substituting,

increase = 55,000 - 35,000

= 20,000 stems / hectare