https://phys.org/news/2018-11-areas-birdlife-climate.html

"Finnish conservation areas are mainly comprised of old-growth forest and peatlands, which prevent the retreat of northern species. It is the impact of climate change on northern species that is causing particular concern. These species are also threatened by deteriorating habitats, such as through forestry and the drying-up of peatlands," explains Petteri Lehikoinen, a researcher at Luomus, the Finnish Museum of Natural History, University of Helsinki.

Northern bird species live under the strain of a warming climate and dispersion barriers, since their spread is restricted by the Arctic Ocean and the Scandinavian Mountains. When species are unable to head further north, their risk of extinction grows. Protected areas are safe havens for such northern birds, accommodating species whose abundance remains high compared to regions outside the conservation areas.