Canadian Muskoxen Hit by Double Punch of Novel Diseases and Climate Change

Why It Matters

The decline threatens a critical food source for Inuit communities and signals how climate‑linked disease emergence can destabilize Arctic wildlife and cultural resilience.

Key Takeaways

• Erysipelothrix Arctic clone cut Banks Island muskox from 37k to <14k (2010‑2014).
• Brucellosis seroprevalence in Victoria Island muskox rose sharply since 2015.
• Community‑based surveillance across seven Inuit communities identified multiple outbreaks.
• Arctic warming is four times global rate, intensifying rain‑on‑snow events.
• Lungworm loads and mineral deficiencies now observed in northern muskox herds.

Pulse Analysis

Muskoxen once teetered on the brink of extinction after early‑20th‑century overhunting, yet a 1917 ban spurred a remarkable rebound to over 100,000 individuals across Canada. This resurgence masked a silent crisis: the emergence of a novel Erysipelothrix rhusiopathiae strain, dubbed the "Arctic clone," which slashed the Banks Island herd from roughly 37,000 in 2010 to under 14,000 by 2014 and sparked similar die‑offs on Victoria and Ellesmere islands. Simultaneously, brucellosis—historically a caribou disease—has surged in muskoxen since 2015, raising zoonotic risks for hunters.

The rapid detection of these pathogens owes much to a pioneering "two‑eyed seeing" surveillance model that blends Indigenous knowledge with modern science. Inuit hunters from seven communities collect tissue samples and share observational data, enabling researchers to map mortality hotspots and trace bacterial genetics in near real‑time. This collaborative framework not only uncovered the Arctic clone’s spread but also flagged rising brucellosis rates, informing safe handling protocols and guiding targeted interventions. The model exemplifies how co‑produced data can bridge logistical gaps in remote Arctic monitoring.

Beyond disease, accelerating climate change compounds stress on muskox populations. The Arctic is warming nearly four times faster than the global average, fostering rain‑on‑snow events that harden snow crusts and limit forage access, while permafrost thaw alters soil mineral composition, leaving animals deficient in selenium and other nutrients. Expanded lungworm ranges further erode respiratory health. Together, these factors threaten the cultural and nutritional lifeline that muskoxen provide to Inuit peoples, underscoring the urgency for integrated wildlife health policies and climate mitigation strategies.