{"id":117633,"date":"2025-09-03T20:55:09","date_gmt":"2025-09-03T20:55:09","guid":{"rendered":"https:\/\/www.newsbeep.com\/ca\/117633\/"},"modified":"2025-09-03T20:55:09","modified_gmt":"2025-09-03T20:55:09","slug":"why-the-return-of-wolves-is-changing-yellowstones-forests","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/ca\/117633\/","title":{"rendered":"Why the return of wolves is changing Yellowstone\u2019s forests"},"content":{"rendered":"

The reintroduction of gray wolves to Yellowstone National Park in 1995 was meant to bring balance to a disrupted ecosystem. Nearly three decades later, the results are becoming clear\u2014especially in the forests of the park\u2019s northern range, where a new generation of quaking aspen is thriving for the first time in 80 years.<\/p>\n

Wolves (Canis lupus) had disappeared from Yellowstone by the 1930s due to habitat destruction, hunting, and deliberate eradication programs. Without them, the elk population (Cervus canadensis) exploded\u2014reaching an estimated 18,000 individuals. These elk heavily grazed the landscape, eating everything from grasses and shrubs to the twigs and bark of young aspen, preventing new trees from growing.<\/p>\n

\u201cYou had older trees, and then nothing underneath,\u201d said Luke Painter, an ecologist at Oregon State University and lead author of a new study published in Forest Ecology and Management.<\/p>\n

A dramatic ecological shift<\/p>\n

When wolves were brought back in 1995, elk numbers began to decline. Today, the elk population in the park has dropped to around 2,000. Painter and his colleagues returned to three areas they had first studied in 2012, looking specifically at aspen regeneration<\/a>.<\/p>\n

They surveyed 87 aspen stands and found that one-third had a widespread presence of tall aspen saplings, while another third had large patches of them. \u201cWe\u2019re seeing significant new growth of young aspen,\u201d said Painter. \u201cThis is the first time we\u2019ve found it in our plots.\u201d These new trees\u2014defined by trunks over 2 inches (5 cm) in diameter at chest height\u2014haven\u2019t been seen in these areas since the 1940s.<\/p>\n

He added, \u201cIt doesn\u2019t mean they won\u2019t die, but it\u2019s a good sign we\u2019re getting new trees. As they grow taller, they become more resilient.\u201d These maturing trees are now large enough to reproduce\u2014either by spreading through root shoots or by producing seeds.<\/p>\n

\"\"<\/p>\n

The researchers found tall aspen saplings in many of the sites studied. (Image credit: Photo provided by Luke Painter, OSU College of Agricultural Sciences.)<\/p>\n

Bison, biodiversity, and beyond<\/p>\n

Still, Yellowstone\u2019s aspen recovery isn\u2019t guaranteed. While elk numbers have dropped, bison (Bison bison) populations have increased in some areas. \u201cBison are much harder for wolves to hunt,\u201d said Painter, which means their growing numbers could become a new challenge for young aspen trees.<\/p>\n

What\u2019s remarkable about this recovery, according to Painter, is that it\u2019s driven not by climate shifts or weather patterns, but by the return of a top predator. \u201cAspen are a keystone species,\u201d he explained. \u201cTheir open canopy filters light in ways that support a wide diversity of plant life.\u201d<\/p>\n

That diversity includes fruit-bearing shrubs, insects, and birds\u2014as well as species like beavers, which use aspen, willows, and cottonwoods for both food and building materials. The ripple effect of more aspen could reshape entire parts of the ecosystem.<\/p>\n

And the benefits may extend even further. Painter noted that populations of bears and cougars in the area also appear to have increased since wolves were reintroduced, though the exact reasons remain unclear.<\/p>\n

Rewilding and its impact<\/p>\n

\u201cThe paper shows the important ecological benefits occurring from the restoration of wolves to Yellowstone,\u201d said Dominick Spracklen, professor of biosphere-atmosphere interactions at the University of Leeds. Spracklen, who has studied wolf reintroduction proposals in Scotland, emphasized that ecosystems lacking apex predators<\/a> often spiral out of balance.<\/p>\n

\u201cWhile reintroducing large carnivores presents real challenges\u2014especially around human-wildlife coexistence\u2014this work highlights the profound ecological rewards such efforts can bring,\u201d he said.<\/p>\n

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