Scientists estimate that 37 of the animals now roam the rugged archipelago, which has contributed to the dwindling moose population. But the predator-prey ratio might be stabilizing To estimate the wolf population, researchers observed animals from planes, followed tracks on the ground and inspected kill sites this year. Rolf Peterson The gray wolf population on a rugged archipelago in northwestern Lake Superior has surged to its highest number in nearly 50 years. After completing their annual survey this year, scientists estimate 37 of the apex predators are now roaming around  Isle Royale , a 132,000-acre U.S. national park that’s part of Michigan and located near Thunder Bay, Canada. The moose population, meanwhile, has declined to an estimated 524 animals, according to a  report released in April. Together, the new figures suggest Isle Royale is returning to a healthier predator-prey dynamic after years of imbalance.…