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Tundra

The tundra is a treeless polar desert found in the high latitudes in the polar regions, primarily in Alaska, Canada, Russia, Greenland, Iceland, and Scandinavia, as well as sub-Antarctic islands. The region's long, dry winters feature months of total darkness and extremely frigid temperatures.


Structurally, the Tundra is a treeless expanse that supports communities of sedges and heaths as well as dwarf shrubs. Vegetation is generally scattered, although it can be patchy reflecting changes in soil and moisture gradients. Most precipitation falls in the form of snow during the winter while soils tend to be acidic and saturated with water where not frozen.


Tundra ecoregions were selected primarily because of extraordinary seasonal concentrations of breeding waterfowl and shorebirds, as well as caribou. Relatively intact tundra ecoregions were chosen, wherever possible. Some tundra ecoregions such as Chukotsky are distinctive in that they display an appreciable level of regional plant endemism.

Biodiversity Patterns
Species typically have widespread distributions, except for some herbaceous plants; low alpha diversity, low beta diversity.

Minimum Requirements
Vast natural habitats are required to allow many species to track patchy resources that vary in location from one year to the next (e.g., lemming irruptions), the presence of varied habitats and associated resources is critical for the survival of many vagile vertebrates; migration corridors for large vertebrates must remain intact to allow large-scale seasonal movements (e.g., caribou).

Sensitivity to Disturbance
Groundcover and surface water flow is highly sensitive to disturbance with very poor resiliency; many vertebrates highly sensitive to the presence of humans or to low intensity hunting; polar ecosystems are particulary sensitive to changes in climatic parameters associated with global climate change; toxins and other compounds tend to sequester and break down only slowly in polar ecosystems.

 

Australasia

Antipodes Islands, south of New Zealand

Antarctic

Antarctic islands in the southern Indian Ocean
Antarctica: East of the Transantarctic Mountains
Antarctica: West of the Transantarctic Mountains,

Nearctic

Torngat Mountain tundra
Pacific Coastal Mountain icefields and tundra
Ogilvie-MacKenzie alpine tundra
Middle Arctic tundra
Low Arctic tundra
Kalaallit Nunaat low arctic tundra
Kalaallit Nunaat high arctic tundra
Interior Yukon-Alaska alpine tundra
High Arctic tundra
Davis Highlands tundra
Brooks-British Range tundra
Beringia upland tundra
Beringia lowland tundra
Baffin coastal tundra
Arctic foothills tundra
Arctic coastal tundra
Aleutian Islands
Alaska-St. Elias Range

Palearctic

Russian Arctic
Wrangel and Herald Islands in Arctic Russia
Eastern Asia: Eastern Russia, east of Lake Baikal
Taimyr-Central Siberian tundra
Europe: Norway, Sweden, Finland
Novosibirsk Islands arctic desert
Northwest Russian-Novaya Zemlya tundra
Northeast Siberian Coastal Tundra
Kola Peninsula tundra
Kamchatka Mountain tundra and forest tundra
Chukchi Peninsula tundra
Cherskii-Kolyma mountain tundra
Eastern Asia: Eastern Russia
Arctic desert

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