Study suggests wolves could curb deer population, aid woodland regeneration
In a groundbreaking study, researchers propose that reintroducing grey wolves to the Scottish Highlands could have a transformative impact on forest regeneration and carbon sequestration. Published in the journal Ecological Solutions and Evidence, the study suggests that a population of over 160 wolves could effectively manage the region’s burgeoning red deer numbers, which currently stand at approximately 400,000 due to the absence of natural predators.
Unchecked deer population hindering forest growth
Scotland’s red deer population has grown unchecked, significantly impacting woodland expansion. Without predators like the gray wolf, deer, and sheep are overgrazing, preventing the natural regeneration of tree saplings. The study suggests that by reducing deer density, wolves could facilitate widespread forest growth, absorbing up to 1 million metric tons of CO2 annually—equivalent to 5% of the UK’s woodland carbon removal target.
“Large carnivores, including the grey wolf (Canis lupus), play an important role in the carbon cycle by modifying the behavior and population of wild herbivores. Large carnivores have been eradicated from much of their former range and are now absent from the UK, contributing to increased herbivore populations, which can prevent the natural regeneration of trees and woodland. Reintroduction of wolves to the UK could reduce deer populations and associated browsing of tree saplings, but the potential impacts on woodland expansion and carbon sequestration have not been assessed,” the study stated.
Projected impact on carbon sequestration
According to simulations conducted by researchers, reintroducing wolves to four key regions in Scotland could establish a stable population of approximately 167 wolves. This would be sufficient to lower deer density to four per square kilometre within two decades, allowing forests to recover and expand.
Each wolf is estimated to contribute to the regrowth of woodlands capable of sequestering around 6,080 metric tons of CO2 annually, translating to an estimated value of $195,000 in carbon credits. Over a century, these restored forests could absorb 100 million metric tonnes of CO2, making a substantial contribution to Scotland’s climate action efforts.
“Large-scale expansion of woodlands facilitated through the return of wolves can contribute to national climate targets and could provide potential economic benefits to landowners and communities through carbon finance,” the study’s authors wrote.
Challenges and potential conflicts
Despite the promising findings, researchers acknowledge several challenges to implementing such a reintroduction program. The study does not account for the initial costs of establishing a wolf population, nor does it explore how changes in herbivore behavior and woodland expansion might affect soil carbon levels.
Moreover, the reintroduction of wolves raises concerns about potential conflicts with human activities, particularly livestock farming. The presence of predators could lead to disputes between conservationists, landowners, and agricultural communities.
“We recognize that substantial and wide-ranging stakeholder and public engagement would be essential before any wolf reintroduction could be considered. Human-wildlife conflicts involving carnivores are common and must be addressed through public policies that account for people’s attitudes for reintroduction to be successful,” the researchers noted.
As discussions around climate change solutions continue, the prospect of reintroducing apex predators to balance ecosystems and aid carbon sequestration presents both opportunities and challenges. Whether Scotland embraces the return of wolves remains to be seen, but the study underscores the critical role that large carnivores can play in ecological restoration and climate mitigation efforts.