Michigan's moose decline has researchers studying causes

State, tribal and university researchers will collar up to 43 moose in the western Upper Peninsula this month as part of a study into factors behind a roughly 30% drop in survey counts since 2023.

State, tribal and academic teams are beginning the next phase of a study to understand why Michigan's Upper Peninsula moose population has not reached expected levels. The project builds on an initial year when 20 moose were captured and fitted with tracking collars. Officials say they are investigating disease, nutrition, reproduction, predation, vehicle collisions and habitat alteration as possible factors. Field work to expand the dataset is scheduled for Feb. 13–21 in the Michigamme Highlands. Key details: - Researchers plan to fit GPS collars on up to 43 moose within the herd's core western U.P. range. - The DNR's 2025 aerial survey estimated about 300 moose, roughly 30% fewer than the 426 counted in 2023. - First-year results showed 17 of 20 collared moose alive; of 10 collared females, eight were pregnant and produced 11 calves. - Officials report known stressors that include wolves and black bears, vehicle collisions (about 60 moose killed over four years) and winter ticks. Summary: Researchers expect the expanded dataset to clarify how multiple, compounding stressors affect moose population growth and distribution. The next field effort is the planned captures on Feb. 13–21, and the study is supported through 2028 by a grant to the Keweenaw Bay Indian Community. Whether the lower survey estimate reflects an actual decline, a shift in distribution, or both is undetermined at this time.