Many bird species in Europe are moving to higher and colder habitats as the climate warms. Over the last 20 years, sunny southern slopes have become more appealing for birds than shadier northern ones.
A recent study looked at 177 bird species across four major mountain ranges: the Alps, the Pyrenees, the Scandinavian Mountains, and the British Highlands. The study found that 63% of these species are migrating uphill at an average rate of about half a meter each year.
Interestingly, the fastest changes occurred in the Scandinavian Mountains and the Alps. For instance, the northern wheatear has moved an average of 33 meters uphill since 2001. In contrast, Great Britain and the Pyrenees showed no significant shifts. This variation suggests that factors like the intensity of climate change and human land use influence these movements differently across regions.
In mountains, microclimates can change drastically over short distances. The northern slopes receive less sunlight, creating cooler and wetter conditions. These climate differences directly affect the habitats available for different bird species.
PhD researcher Joséphine Couet from the Finnish Museum of Natural History highlights, “Birds are attracted to sunny slopes at higher elevations because that’s where they’ll find vegetation and food resources. Yet, birds are also climbing on shadier slopes. This indicates that rising temperatures impact the entire mountain landscape.”
The findings reveal that broader climatic patterns are pushing birds uphill across Europe. While less sun-exposed slopes may offer some shelter, these advantages aren’t enough to stop the overall upward trend.
Couet further notes, “Mountain areas are not just beautiful; they’re biodiversity hotspots. Many species rely on specific climate conditions. Understanding these shifts is vital for conservation efforts in complex terrains.”
This research, published in Global Ecology and Biogeography, is based on bird monitoring data collected from eight European countries between 2001 and 2021.
Experts are concerned about these changes. According to a recent report by the European Environment Agency, species migration patterns are increasingly influenced by climate change, with potential long-term effects on ecosystems. As bird populations adjust, some may thrive while others face threats of decline or extinction—highlighting the urgency for conservation planning.
Overall, this study sheds light on how climate change disrupts habitats and the delicate balance within mountain ecosystems. It emphasizes the need for ongoing research and conservation efforts to protect our planet’s biodiversity.
