Researching Denali’s Wolf and Caribou Populations

Like most other parks, Denali welcomes visitors year-round, but what makes it unique is that much of its vast wilderness has been protected from significant human influence, making it ideal for scientific research and study. For the past 36 years, land managers and National Park Service (NPS) biologists have continuously tracked Denali’s wolf and caribou populations in one of the longest-running wildlife monitoring programs in the world.

Data gathered over such a long span of time is very rare, but it is crucial for understanding parks and their habitats and wildlife. It allows scientists to investigate questions that would be impossible to answer with only a few years’ data, on topics such as the effect of climate on ecosystems, how disease circulates within a population, and animal behavior patterns. At Denali National Park and Preserve, this research provides groundbreaking insights into the predator-prey dynamic between wolves and caribou and how it impacts the rest of the park’s sub-arctic ecosystem.

In 2020, with the onset of the COVID-19 pandemic and a downturn in tourism, funding for this program was dwindling and the legacy of this longstanding research program was in jeopardy. With help from funding from National Park Foundation, this monitoring program continues without interruption.

Thanks in part to this financial support, over the past year, NPS biologists have continued their tracking of wolf and caribou across two million acres of Denali National Park and Preserve. Monitoring activities include:

• Tracking wolves via helicopter and GPS collars to observe their movements, space use, pack size, predation, and reproduction.
• Setting up trail cams to monitor wolf den sites including pup counts and rates of pup survival.
• Conducting pregnancy, post pregnancy, and count surveys of the Denali Caribou Herd.
• Conducting aerial monitoring to investigate Caribou survival & mortality rates, as well as their movements and seasonal distribution throughout the year.
• Conducting outreach and education on wildlife and wildlife research in Denali.

NPS uses this data to publish and share scientific research covering topics like the impact of disease on wolf reproduction and survival at Denali, pack dynamics, and much more. The research has informed various NPS studies including one on the Denali wolves and Denali caribou.