"Abstract: I studied the diets of fishers (Martes pennanti) in Minnesota during 8 winters when the snowshoe hare (Lepus americanus) population declined. Fishers consumed less hare as the hare population declined, but fisher fat deposits and reproduction did not decrease. Fisher numbers in Minnesota are unlikely to track hare cycles and further restrictions on trapping may not be necessary to counteract effects of the hare decline."
P. 688