Northern Canadian Shield taiga | |
---|---|
Ecology | |
Realm | Nearctic |
Biome | Boreal forests/taiga |
Borders | |
Geography | |
Area | 613,827 km2 (237,000 sq mi) |
Country | Canada |
Province | |
Coordinates | 60°00′N100°00′W / 60.0°N 100.0°W |
Conservation | |
Conservation status | Relatively Stable/Intact [1] |
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. The open forest in this transition zone is characterized by widely scattered, stunted stands of black spruce ( Picea mariana ) and tamarack ( Larix laricina ), with some white spruce ( Picea glauca ). The ecoregion lies over the northwestern extent of the Canadian Shield. [1] [2] [3] [4]
The terrain is broad, sloping uplands reaching to 701 metres (2,300 ft) in elevation, [2] resting on Archean rocks. There are many lakes, with drainage trending towards Great Slave Lake. Permafrost is discontinuous to continuous. [1]
The climate of the ecoregion is Subarctic climate, without dry season (Köppen climate classification Subarctic climate (Dfc)). This climate is characterized by mild summers (only 1-3 months above 10 °C (50.0 °F)) and cold, snowy winters (coldest month below −3 °C (26.6 °F)). [5] [6] Precipitation averages 200 - 400 mm/year. [1]
The ground cover in the ecoregion is 33% herbaceous cover, 15% shrubs, 19% open forest, 15% closed forest. Water bodies cover 18% of the region. [2] The characteristic trees are black spruce ( Picea mariana ), white spruce ( Picea glauca ), jack pine ( Pinus banksiana ) and tamarack ( Larix laricina ) . Ground cover includes extensive dwarf birch ( Betula nana ), ericaceous shrubs ( Ericaceae ), cottongrass ( Eriophorum ), lichen and moss. [1] The vegetation is relatively undisturbed by human activity, with 90-95% of the region intact. [1]
Approximately 8% of the ecoregion is in an officially protected area, including:
Picea mariana, the black spruce, is a North American species of spruce tree in the pine family. It is widespread across Canada, found in all 10 provinces and all 3 territories. It is the official tree of the province of Newfoundland and Labrador and is that province's most numerous tree. The range of the black spruce extends into northern parts of the United States: in Alaska, the Great Lakes region, and the upper Northeast. It is a frequent part of the biome known as taiga or boreal forest.
The New England-Acadian forests are a temperate broadleaf and mixed forest ecoregion in North America that includes a variety of habitats on the hills, mountains and plateaus of New England and New York State in the Northeastern United States, and Quebec and the Maritime Provinces of Eastern Canada.
The eastern forest–boreal transition is a temperate broadleaf and mixed forests ecoregion of North America, mostly in eastern Canada. It is a transitional zone or region between the predominantly coniferous Boreal Forest and the mostly deciduous broadleaf forest region further south.
The Gulf of St. Lawrence lowland forests are a temperate broadleaf and mixed forest ecoregion of Eastern Canada, as defined by the World Wildlife Fund (WWF) categorization system.
The Alberta–British Columbia foothills forests are a temperate coniferous forests ecoregion of Western Canada, as defined by the World Wildlife Fund (WWF) categorization system. This ecoregion borders Canada's taiga and contains a mix of subarctic forest and temperate forest species as a result. This makes the region an ecotone region, or a region that acts as a buffer between two other biomes.
The Eastern Canadian Shield taiga is an ecoregion of Canada as defined by the World Wildlife Fund (WWF) categorization system.
The Muskwa-Slave Lake Taiga ecoregion covers Canadian taiga in northwestern Alberta, northeastern British Columbia and a large portion of the southwestern Northwest Territories around the Mackenzie River valley and the Great Slave Lake.
The interior Alaska–Yukon lowland taiga is an ecoregion in the taiga and boreal forests biome, of far northern North America.
The Mid-Canada Boreal Plains Forests is a taiga ecoregion of Western Canada, designated by One Earth. It was previously defined as the Mid-Continental Canadian Forests by the World Wildlife Fund (WWF) categorization system, before it was modified by One Earth, the successor to WWF.
The Midwest Canadian Shield Forests is an ecoregion in Canada, classified as a Taiga and Boreal Forests Biome.
The Central Canadian Shield forests are a taiga ecoregion of Eastern Canada, as defined by the World Wildlife Fund (WWF) categorization system.
The Western Great Lakes forests is a terrestrial ecoregion as defined by the World Wildlife Fund. It is within the temperate broadleaf and mixed forests biome of North America. It is found in northern areas of the United States' states of Michigan, Wisconsin and Minnesota, and in southern areas of the Canadian province of Manitoba and northwestern areas of the province of Ontario.
Central Siberia Nature Reserve is a Russian 'zapovednik'. With over 1 million hectares of protected area, it is one of the largest forest reserves in the world. The reserve is located in the middle Yenisei, lower Bakhta and lower Stony Tunguska river valleys, of the Central Siberian Plateau. Notably, the territory covers both banks of the Yenisei for over 60 km. The reserve is situated in the Turukhansky District of Krasnoyarsk Krai.
The Sakhalin Island taiga ecoregion covers most of Sakhalin Island, the largest island of Russia, which is separated from the mainland by the Sea of Okhotsk and the Sea of Japan. The region is one of taiga, coniferous and mixed broad leaf forest landscape, with mixed larch forests at the lower elevations and shrubs at higher elevations. The vegetation is influenced by a maritime climate that is relatively warmer than the colder continental taiga in Siberia to the west. A long, thin island, 1,000 km by 200 km, Sakhalin is connected to the mainland by ice bridges in the winter, so it shares certain flora and fauna species. It is in the Palearctic realm, and mostly in the taiga biome with a Humid continental climate, cool summer climate. It covers 403,504 km2 (155,794 sq mi).
The Sayan montane conifer forests ecoregion covers the mid-elevation levels of the Sayan Mountains, the high mountain range between the taiga of Siberia, Russia to the north, and the steppes of Mongolia to the south. The slopes of the mountains at the mid-altitudes are covered by Temperate coniferous forest. The ecoregion is in the Palearctic realm, with a cold semi-arid climate. It covers 35,741,835 km2 (13,800,000 sq mi).
The Southern Hudson Bay taiga is a terrestrial ecoregion, as classified by the World Wildlife Fund, which extends along the southern coast of Hudson Bay and resides within the larger taiga biome. The region is nearly coterminous with the Hudson Plain, a Level I ecoregion of North America as designated by the Commission for Environmental Cooperation (CEC) in its North American Environmental Atlas.
The Northwest Territories taiga ecoregion (WWF:NA0614) is located in the Northwest Territories and Yukon provinces of Canada. It covers forest and tundra along the Mackenzie River Valley and the surrounding highlands in the southern portion of the valley.
The Interior Yukon-Alaska alpine tundra ecoregion covers alpine, sub-alpine, and boreal forest areas along the cordillera of Interior Alaska and south-central Yukon Territory. Geologically, they are the disjunct uplands of the Yukon-Tanana Terrane plus a southern extension of the Brooks Range. The cover is extensive 'dark taiga' of closed spruce forest, open forest of other species, and alpine vegetation at higher altitudes. The region is mostly wilderness and relatively untouched by human development.
The Canadian Low Arctic Tundra ecoregion covers a rolling landscape of shrubby tundra vegetation along the northern edge of the mainland Canada along the border of the Northwest Territories and Nunavut, and a small portion in Quebec on the northeast coast of Hudson Bay. The region is important for large herds of caribou and other large mammals, and for large nesting colonies of birds such as snow geese. The region is mostly intact, with 95% remaining intact.
The Ogilvie–MacKenzie alpine tundra ecoregion covers the mountainous middle of the Yukon Territory in Canada, with extensions into the Northwest Territories. The vegetation is alpine and subalpine open forest of stunted spruce, fir and pine. The area is rugged but sections appear to have been unglaciated in the late Pleistocene and there are therefore relic species in the region. The area is remote and supports large, sustainable predator-prey systems.