Dean Pearson
PER
Dean Dean Pearson Pearson Dr. Pearson
Dean Pearson, who works at the Rocky Mountain Research Station of the United States Forest Service, said the fly had not halted the spread of knapweed. In a report in Ecology Letters, however, Dr. Pearson reports that the introduced fly has changed the ecosystem's dynamics. Mice numbers have tripled because of this food supply, said Dr. Pearson, and with them hantavirus, a viral infection is spread by urine and droppings.