What Makes Wolves Visible From the Denali Park Road?

Many visitors come to Denali National Park and Preserve in Alaska hoping to see its famous animals — moose, caribou, grizzly bears and wolves. Wildlife viewing in protected areas keeps growing in popularity, and park managers are often expected to provide it. Yet few studies have measured what actually decides whether people see wildlife, or whether management choices can change those chances.

Bus passengers watch a wolf on the park road. Image from NPS’s page.

The study

Researchers combined two sources of data:

• wolf sightings recorded on 2,945 trips along the Denali park road
• locations from GPS-collared wolves

They then tested how the chance of a sighting depended on the wolves themselves, the landscape, and wolf harvest — hunting and trapping — on the land bordering the park.

What raised the odds

Some results were as expected. Wolves were seen more often:

• where vegetation was open rather than screening the view
• when packs were larger
• when a pack’s den was near the road

The harvest effect

The surprise was the influence of wolf harvest outside the park. In years when harvest was closed on land next to the park, sightings rose the closer a pack denned to the road. In years when harvest was allowed, how close the den lay made no difference.

The size of the closure’s effect was striking: it matched adding two wolves to a pack, or a more than two-fold decrease in screening vegetation. The findings held across a 10-fold change in the spatial scale of the analysis.

The researchers suggest this may mean that risk from people changes how wolves behave — but say more research is needed to establish a link between harvest and wolf behavior.

Why it matters

Measuring what drives wildlife sightings gives agencies a real basis for managing viewing opportunities. In Denali, it points to something beyond the park’s boundary — what happens to wolves on neighboring land — as one of the things that decide whether a busload of visitors sees one.

Sources

Based on "What determines the likelihood of seeing wolves in Denali?", National Park Service, summarizing Borg BL, Arthur SM, Falke JA, Prugh LR, "Determinants of gray wolf (Canis lupus) sightings in Denali National Park," Arctic 74(1): 51–66 (2021); the NPS summary is a work of the United States government in the public domain, and the study’s abstract is rewritten in hubnx’s own words.