Summary
Highlights
Isle Royale, a remote island in Lake Superior, is home to a predator-prey relationship between wolves and moose that has been studied for 50 years. Researchers initially believed the wolves were isolated and inbred without significant negative effects, but subsequent findings revealed high rates of spinal deformities (1 in 3 wolves compared to 1 in 100 in normal populations) and evidence of external genetic input.
For 13 years, researchers have collected wolf scats for DNA analysis. This data recently revealed that a wolf migrated from Canada to Isle Royale in 1997. This wolf, larger and more dominant, significantly improved the struggling wolf population, serving as strong evidence of the adverse effects of inbreeding depression on the Isle Royale wolves before his arrival.
Isle Royale demonstrates the ease with which ecologists can misunderstand nature. The wolf population has drastically declined from 30 wolves in four packs in early 2009 to approximately 15 adult wolves in a single pack today, a situation unprecedented in four decades. This decline is largely attributed to a low moose population, which in turn is affected by climate change. Warmer temperatures are detrimental to moose, impacting their feeding habits and increasing the prevalence of disease-causing ticks.
With only one or two adult female wolves remaining, the wolf population faces potential extinction. This raises the ethical question of whether to reintroduce wolves into a federally designated wilderness area, where non-intervention is typically the management approach. However, human-induced climate change has reduced ice bridge formation, making natural wolf migration unlikely. This situation on Isle Royale serves as a microcosm for a broader national discussion about human impact on wilderness and our evolving relationship with nature, necessitating broad dialogue among citizens and federal agencies.