Documenting lemming population change in the Arctic: Can we detect trends?

Area of Science:

• Ecology
• Arctic Biology
• Population Dynamics

Background:

• Lemmings are crucial to Arctic tundra food webs, influencing ecosystem stability.
• Understanding lemming population dynamics is essential for predicting ecosystem responses to environmental change.

Purpose of the Study:

• To provide a comprehensive overview of lemming monitoring and research across the circumpolar Arctic.
• To assess recent trends in lemming abundance and identify gaps in monitoring efforts.

Main Methods:

• Compiled data from 49 circumpolar Arctic monitoring sites active since 2000 (38 currently active).
• Assessed monitoring methods, spatial coverage, and data on lemming abundance, health, and genetic diversity.
• Analyzed population trends, particularly in relation to sympatric species like voles.

Main Results:

• Monitoring sites are unevenly distributed, with underrepresentation in Russia and high Arctic Canada.
• Abundance data were collected, but methods and precision varied significantly.
• No general decrease in lemming populations was observed, but low Arctic populations shared with voles showed a negative trend.

Conclusions:

• Continued long-term lemming monitoring is recommended to keep pace with Arctic change.
• Harmonizing monitoring methods, enhancing spatial coverage, and integrating an ecosystem perspective are crucial.
• Future research should address under-monitored regions and population attributes like health and genetics.