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Fire is the dominant type of disturbance in boreal North America, but the past 30-plus years have seen a gradual increase in fire frequency and severity as a result of warmer and drier conditions. From the 1960s to the 1990s, the annual area burned increased from an average of 1.4 to 3.1 million hectares per year.
Taiga in its current form is a relatively recent phenomenon, having only existed for the last 12,000 years since the beginning of the Holocene epoch, covering land that had been mammoth steppe or under the Scandinavian Ice Sheet in Eurasia and under the Laurentide Ice Sheet in North America during the Late Pleistocene.
The taiga forests are mainly white spruce (Picea glauca), alaskan birch (Betula neoalaskana), balsam poplar (Populus balsamifera), and quaking aspen (Populus tremuloides) in the warmer drier areas, and black spruce (Picea mariana), and american larch (Larix laricina) where it is marshier but the ecoregion also contains scrubby areas of dwarf birch (Betula nana) and riverbanks of willows ...
These are birds that more than half of the North American populations nest in the boreal forest. Many of these birds need mature forests or isolated, non-populated wetlands that now have been largely cleared outside of the boreal forests. Hooded merganser. Trumpeter swan, Cygnus buccinator; American wigeon, Anas americana
A boreal ecosystem is an ecosystem with a subarctic climate located in the Northern Hemisphere, approximately between 50° and 70°N latitude. These ecosystems are commonly known as taiga and are located in parts of North America, Europe, and Asia. [1] The ecosystems that lie immediately to the south of boreal zones are often called hemiboreal ...
This ecoregion is a mountainous area of ridges up to 1200m between peaks up to 2500m, located on the southern, Pacific Ocean side of the Alaska Peninsula from Cook Inlet west through the Kodiak Archipelago to Unimak Island at the beginning of the Aleutian Islands chain, while the area around Cook Inlet at the head of the peninsula is the neighboring Cook Inlet taiga ecoregion.
Northern Canadian Shield taiga is a taiga ecoregion located in northern Canada, stretching from Great Bear Lake in the Northwest Territories to Hudson Bay in eastern Nunavut. The region supports conifer forests to its northern edge, where the territory grades into tundra .
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