The purple skydrop is a rare type of flower. It is star-shaped and is pollinated primarily by black-winged sparrows. Because it requires direct sunlight, its range in the past has been limited to a few open meadows within Sylvan State Forest. Recently, however, hundreds of trees in Sylvan Forest were destroyed by a blight and were removed by park rangers. If the blight continues to spread, it is probable that the range of the purple skydrop will expand into the new open meadows created by the removal of the trees.
Which of the following, if true, most seriously weakens the argument?