Bacteria Linked to Muskox Die-offs in Canadian Arctic

A 2025 study identifies a specific bacterium strain behind mass muskox deaths across the Canadian Arctic.

Updated on Oct. 29, 2026 in Life Sciences

A solitary muskox standing on a wide, desolate, and windswept Arctic tundra plain under diffuse daylight. — A 2025 study in Scientific Reports identifies a specific Arctic bacterial strain linked to mass die-offs of muskoxen across the Canadian Arctic. AI Illustration. Upload story photo >

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A 2025 study in Scientific Reports links a bacterial strain known as the Arctic clone to mass die-offs among muskoxen in the Canadian Arctic. Researchers discovered the strain at over 70 percent of 139 surveyed carcass sites on Ellesmere and Axel Heiberg Islands.

Why it matters

The findings help explain the vulnerability of muskoxen, which have the lowest genetic variety of any hoofed animal. This limited diversity may increase the risk of the bacterium affecting additional populations in the future.

Researchers studied 139 sites across Ellesmere and Axel Heiberg Islands, often visiting within 72 hours of a carcass discovery. The bacterial strain previously appeared on Victoria Island 11 years before emerging in the surveyed regions.

The players

Scientific Reports

This is a peer-reviewed open-access scientific journal that publishes primary research from all areas of the natural and clinical sciences.

Molecular Ecology

This is a scientific journal that publishes research on the application of molecular genetic techniques to problems in ecology, evolution, and conservation.

The details

The Arctic clone bacterium was identified as a primary factor in deaths among muskoxen, which typically stand 4 to 5 feet tall and weigh between 500 and 800 pounds. While these animals traditionally form defensive circles against predators, they remain susceptible to this widespread bacterial strain.

Muskox populations began to decline 30,000 years ago.
Muskox lived on Wrangel Island 21,000 years ago.
A film crew found 28 dead muskoxen on Ellesmere Island in summer 2021.
A Molecular Ecology study on muskox genetic variety was published in 2024.
A Scientific Reports study regarding bacterium-linked die-offs was published in 2025.

The Big Picture

This study shifts scientific understanding by confirming a biological agent behind population collapses in an animal with critically low genetic diversity. These findings provide new data for the Arctic Council's biodiversity monitoring programmes regarding how disease contributes to long-term population trends.

Understanding the impact of this bacterium on muskoxen helps researchers refine conservation strategies for Canadian Arctic wildlife. Future findings may clarify if these pathogens pose risks to other hoofed animals or influence broader ecological stability in northern regions.

The takeaway

The extremely low genetic diversity of muskoxen makes them uniquely vulnerable to environmental stressors like the Arctic clone bacterium. Protecting these populations requires ongoing monitoring of carcass sites to track the spread of pathogens across the Arctic.