Ecosystem change and stability over multiple decades in the Swedish subarctic: complex processes and multiple drivers

Area of Science:

• Environmental science
• Ecosystem dynamics
• Climate change research

Background:

• The subarctic region of northern Sweden has experienced significant environmental shifts over the last century.
• Key elements affected include climate patterns and the cryosphere.
• Long-term, geo-referenced data is essential for understanding these transitions.

Purpose of the Study:

• To present a unique geo-referenced record of environmental and ecosystem observations in northernmost Sweden since 1913.
• To analyze abiotic and biotic changes, including vegetation and herbivore populations.
• To highlight the site-specific nature of ecosystem responses to environmental change.

Main Methods:

• Compilation of a unique geo-referenced dataset spanning over a century (since 1913).
• Analysis of abiotic factors, including climate and cryosphere elements.
• Assessment of vegetation changes (growth, range, composition, abundance) and herbivore population dynamics.

Main Results:

• Substantial abiotic changes observed, impacting the subarctic environment.
• Vegetation responses varied, showing increases, decreases, and stability in growth and range.
• Significant increases in tree and shrub abundance (up to 600%) and shifts in plant communities linked to permafrost thaw and wetland expansion.
• Herbivore populations showed varied responses influenced by management practices and climate, especially snow conditions.

Conclusions:

• Ecosystem changes in the subarctic are highly site-specific, making generalization challenging.
• These detailed, site-specific observations are vital for local stakeholders facing new challenges and opportunities.
• The study area serves as a valuable microcosm for understanding the complexities of Arctic landscapes in transition.