Wolves on a remote island in Lake Superior are thriving, but their growing population is having a significant impact on the moose there. This surprising finding comes from a recent report that highlights the delicate balance of nature on Isle Royale, a national park rich in wildlife.
Isle Royale, spanning 134,000 acres, is nestled in the western part of Lake Superior between Grand Marais, Minnesota, and Thunder Bay, Canada. It serves as a unique natural laboratory where scientists can study the behavior of wolves and moose away from human interference.
Researchers have been monitoring the wolf and moose populations on the island since 1958. Typically, these surveys occur annually during the winter when the island is closed to visitors. However, the past few years have presented challenges. In 2021, the pandemic forced researchers to skip their survey for the first time ever.
In 2024, the National Park Service had to evacuate researchers because unusually warm weather made the ice unsafe for landing planes on Lake Superior. This year, a dedicated team from Michigan Tech University successfully conducted a survey between January 22 and March 3, finally gathering critical data.
The results showed an estimated wolf population of 37—an increase from 30 the previous year. This is the highest number of wolves recorded since the late 1970s, especially impressive given that the population had plummeted to just two wolves about a decade ago due to inbreeding issues.
On the flip side, the moose population is facing a steep decline. Recent surveys estimate that only 524 moose remain on the island, a dramatic drop of 75% from a peak of 2,000 in 2019. Researchers believe that wolves may have killed nearly a quarter of the moose over the past year. Alarmingly, for the first time in almost 70 years, no moose calves were spotted during the winter survey.
Sarah Hoy, a researcher from Michigan Tech who leads the survey, described the challenging conditions they faced, including wind chills plunging to minus 50 degrees Fahrenheit. Despite the cold, clear skies allowed for remarkable observations, and the team spotted wolves on nearly every flight.
One memorable moment was witnessing a pack of wolves snuggling together on the ice on Valentine’s Day. Hoy expressed her excitement, saying, “It’s always such a privilege to get to see wolves interacting, witnessing courtship behavior, pups playfully tugging on each other’s tails, or a pack working together to take down a moose.”
Looking ahead, scientists are planning summer research on Isle Royale to better understand how the growing wolf population can maintain balance within the ecosystem. As the dynamics between these two species evolve, ongoing studies will be crucial to preserving the natural beauty and biodiversity of this unique island.
