Taiga Plains | |
---|---|
Ecology | |
Borders | |
Geography | |
Area | 652,125 km2 (251,787 sq mi) |
Country | Canada |
Provinces | Alberta, British Columbia, Northwest Territories and Yukon |
Climate type | Subarctic |
The Taiga Plain Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a Canadian terrestrial ecozone that covers most of the western Northwest Territories, extending to northwest Alberta, northeast British Columbia and slightly overlapping northeastern Yukon.
It is the site of the Peace-Athabasca Delta, [1] a globally significant wetland in Wood Buffalo National Park, and Nahanni National Park Reserve. [2]
Its eastern boundary is located by Great Bear and Great Slave lakes in the Taiga Shield, site of the world's oldest known rock formations. [3] To its south are the Boreal Plains, a vast forest of spruce and other timber with numerous wetland habitats. Portions of Wood Buffalo National Park and Whooping Crane Summer Range, the only nesting area for the critically endangered whooping crane, overlap onto the Taiga Plains from the Boreal Plains. To the west it abuts the foothills of the Boreal Cordillera in British Columbia and southern Yukon, and the Taiga Cordillera further north. These two ecozones comprise the Mackenzie Mountains. Its northern borders are with the Southern Arctic ecozone in northeastern Northwest Territories, and the Arctic Archipelago Marine ecozone at the delta of Canada's largest river, the Mackenzie. [4]
The ecozone consists primarily of strata of limestone, shale, and sandstone sedimentary rocks, [5] and has formed wide flat plains with rolling terrain throughout. The sedimentary layers contain some "rich natural reservoirs of oil and gas". [6] The western portion, dominated by the Mackenzie, is more rugged with deep canyons and trenches cut by the river and tributaries.
This ecozone can be further subdivided into three ecoprovinces: [7]
Summers are cool and short in this sub-arctic climate, with mean temperatures ranging from 7 °C in the north to 14 °C in the south. [5] [6] Winters are long and very cold in the Mackenzie Delta, with a typical January mean of -26 °C, but are somewhat milder in the southern extent, with a mean January temperature of -15 °C. [5] Little precipitation falls here, an annual average of 250 to 500 mm throughout the zone. [6] Snow and ice cover lasts at least six months, and it is not unusual for it to persist for eight months. [6]
A number of protected areas have been established to protect representative and/or significant portions of this ecozone. These include the Mackenzie Bison Sanctuary, Nahanni National Park Reserve, and Wood Buffalo National Park.
Taiga, generally referred to in North America as a boreal forest or snow forest, is a biome characterized by coniferous forests consisting mostly of pines, spruces, and larches.
The Mackenzie River is a river in the Canadian boreal forest. It forms, along with the Slave, Peace, and Finlay, the longest river system in Canada, and includes the second largest drainage basin of any North American river after the Mississippi.
Alberta is a Canadian province. Located in Western Canada, the province has an area of 661,190 square kilometres (255,290 sq mi) and is bounded to the south by the U.S. state of Montana along 49° north for 298 kilometres (185 mi); to the east at 110° west by the province of Saskatchewan for 1,223 kilometres (760 mi); and at 60° north the Northwest Territories for 644 kilometres (400 mi). The southern half of the province borders British Columbia along the Continental Divide of the Americas on the peaks of the Rocky Mountains, while the northern half borders British Columbia along the 120th meridian west. It is one of only two landlocked provinces.
Nahanni National Park Reserve in the Dehcho Region of the Northwest Territories, Canada, approximately 500 km (311 mi) west of Yellowknife, protects a portion of the Mackenzie Mountains Natural Region. The centrepiece of the park is the South Nahanni River. Four noteworthy canyons reaching 1,000 m (3,300 ft) in depth, called First, Second, Third and Fourth Canyon, line its whitewater river. The name Nahanni comes from the indigenous Dene language name for the area; Nahʔa Dehé, which means "river of the land of the Nahʔa people". The park was among the world's first four natural heritage locations to be inscribed as World Heritage Sites by UNESCO in 1978 because of its picturesque wild rivers, canyons, and waterfalls.
Yukon is in the northwestern corner of Canada and is bordered by Alaska and the Northwest Territories. The sparsely populated territory abounds with natural scenic beauty, with snowmelt lakes and perennial white-capped mountains, including many of Canada's highest mountains. The territory's climate is Arctic in territory north of Old Crow, subarctic in the region, between Whitehorse and Old Crow, and humid continental climate south of Whitehorse and in areas close to the British Columbia border. Most of the territory is boreal forest with tundra being the main vegetation zone only in the extreme north and at high elevations.
The Boreal Shield Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is the largest ecozone in Canada. Covering 1.8 million square kilometres it covers almost 20% of Canada's landmass, stretching from northern Saskatchewan to Newfoundland.
The Arctic Cordillera is a terrestrial ecozone in northern Canada characterized by a vast, deeply dissected chain of mountain ranges extending along the northeastern flank of the Canadian Arctic Archipelago from Ellesmere Island to the northeasternmost part of the Labrador Peninsula in northern Labrador and northern Quebec, Canada. It spans most of the eastern coast of Nunavut with high glaciated peaks rising through ice fields and some of Canada's largest ice caps, including the Penny Ice Cap on Baffin Island. It is bounded to the east by Baffin Bay, Davis Strait and the Labrador Sea while its northern portion is bounded by the Arctic Ocean.
The Arctic Archipelago Marine Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a marine ecozone in the Canadian Arctic, encompassing Hudson Bay, James Bay, the internal waters and some shores of the islands in the Canadian Arctic Archipelago, and the shores of the territories, northern Ontario and western Quebec. Early exploration of these waters by Europeans were conducted to find a passage to the Orient, now referred to as the Northwest Passage.
The Hudson Plains Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a sparsely populated Canadian subarctic ecozone extending from the western coast of Quebec to the coast of Manitoba, encompassing all coastal areas of James Bay and those of southern Hudson Bay, stretching to about 50°N latitude. It includes the largest continuous wetland in the world. It covers nearly a quarter of Ontario's landmass, and 3.6% of Canada's total area, totalling approximately 369,000 square kilometres of land and 11,800 square kilometres of water. Its historical prominence is due to the harshness endured by pioneer explorers who established fortifications for Hudson's Bay Company, and as a result of regional wars between France and Britain. Today, it is primarily noted for the well-known Polar Bear Provincial Park, and to a lesser extent Wapusk National Park, as well as its vast wetlands which are used by migratory birds.
The Taiga Shield Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is an ecozone which stretches across Canada's subarctic region. Some regions exhibit exposed Precambrian bedrock of the Canadian Shield, the oldest of the world's geological formations. The world's oldest rocks, dating to four billion years, are found in the Canadian Shield north of Great Slave Lake.
The Atlantic Maritime Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is an ecozone which covers the Canadian provinces of Prince Edward Island, Nova Scotia, and New Brunswick, as well as the Gaspé Peninsula of Quebec. It is adjacent to the Atlantic Marine Ecozone to the east, and the Mixedwood Plains to the west. The roughly-corresponding Level I Ecoregion to this ecozone in the United States Environmental Protection Agency's classification, which is also part of the CEC system, is the Northern Forests ecoregion, though that classification includes the woodlands and swamps of northern Michigan and Minnesota, which are adjacent to the Boreal Shield ecozone.
The Boreal Plains Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a terrestrial ecozone in the western Canadian provinces of Manitoba, Saskatchewan and Alberta. It also has minor extensions into northeastern British Columbia and south-central Northwest Territories. The region extends over 779,471 km2, of which 58,981 km2 is conserved.
The Prairies Ecozone is a Canadian terrestrial ecozone which spans the southern areas of the Prairie provinces of Alberta, Saskatchewan, and Manitoba. It is a productive agricultural area, and is commonly referred to as "Canada's breadbasket". Farmland covers about 94% of the land, and is the dominant domestic economic activity of the zone, as well as an important factor in Canadian foreign trade. Natural gas and oil are abundant in the area. The corresponding Level II ecoregion of the US Environmental Protection Agency is the Great Plains Ecoregion.
The Taiga Cordillera Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a rugged, mountainous terrestrial ecozone of Canada spanning most of northern Yukon and significant portions of the border between the Yukon and the Northwest Territories.
The Boreal Cordillera Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a Canadian terrestrial ecozone occupying most of the northern third of British Columbia and southern half of Yukon. Within it is found Kluane National Park and Reserve, and a small portion of the southern range of Nahanni National Park Reserve. Most of the area's population is based in the city of Whitehorse, and it contains most of Yukon's population. The portion in British Columbia is barely populated.
The Southern Arctic Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a Canadian terrestrial ecozone which spans the northern coast of mainland Northwest Territories, most of northern mainland Nunavut excepting the northeast peninsula, and a portion of northwestern Quebec. Its two constituent territories are interrupted by Hudson Bay. The ecozone can also be described as including the northernmost part of the Interior Plains of Western Canada and parts of the Canadian Shield located on both sides of northern Hudson Bay.
The Northern Arctic Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a Canadian terrestrial ecozone which includes most of the Canadian Arctic Archipelago, the Boothia and Melville Peninsulas of Nunavut, and the northwestern tip of Quebec. Its marine borders are with the Arctic Archipelago Marine Ecozone, and it is adjacent to the mainland Southern Arctic Ecozone.
The Peel watershed drains 14% of the Yukon Territory Canada and flows into the Beaufort Sea via the Peel and then Mackenzie Rivers. While the lower part of the Peel River and its confluence with the Mackenzie River are in the North West Territories, most of the watershed, 68,000 km2 out of 77,000 km2 is in the Yukon. Six major tributaries and numerous smaller streams feed the Peel. The Yukon portion of the watershed is undergoing land use planning, a process laid out in Chapter 11 of the Yukon Land Claims Agreement and is called the Peel Watershed Planning Region (PWPR). This article is confined to the PWPR.
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.