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How do Low Arctic and High Arctic environments differ?
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Polar ecosystem
Southern limit of Arctic tundra and approximate line of demarcation between Low and High Arctic.
The High Arctic and Low Arctic are distinguished primarily by ecological criteria, including the length of the growing season, summer temperatures, and the richness of flora and fauna.1
Key Differences
- Vegetation: The Low Arctic is characterized by more extensive plant cover, including low-shrub and tall-shrub tundra (such as willow, dwarf birch, and alder) and sedge-moss meadows. In contrast, the High Arctic has significantly less vegetation, containing only about half the number of vascular plant species found in the Low Arctic. Shrub species are markedly reduced in the High Arctic, where the landscape often transitions into polar desert or polar barrens.2
- Climate: The High Arctic experiences cooler summers and drier conditions compared to the Low Arctic. These harsher environmental constraints limit the biological productivity of the region.23
- Biodiversity: Species diversity declines with increasing latitude. While the Low Arctic supports a wider variety of plants and animals, High Arctic populations live closer to their biological limitations, making them more susceptible to local extinction during periods of extreme weather.23