Middle Arctic tundra

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Canadian Middle Arctic Tundra
Muskox 09-28.06.98.jpg
Middle Arctic tundra map.svg
Ecoregion territory (in green)
Ecology
Realm Nearctic
Biome Tundra
Borders
Geography
Area1,034,340 km2 (399,360 sq mi)
Country Canada
Province/Territory
Coordinates 67°15′N91°45′W / 67.25°N 91.75°W / 67.25; -91.75
Climate type Polar

The Canadian Middle Arctic Tundra ecoregion covers a broad stretch of northern Canada - the southern islands of the Arctic Archipelago, plus the northern mainland of Nunavut and, across Hudson Bay to the east, a portion of northern Quebec. [1] [2] [3] [4] [5] This is the coldest and driest ecoregion in Canada, and can be referred to as a 'polar desert'. It is an important region for breeding and migratory birds, and supports 80% of the world's muskox. [1]

Contents

Location and description

The ecoregion stretches over 2,500 kilometres (1,600 mi) from west to east: Banks Island, Victoria Island, King William Island, northeast Nunavut, and the southern portions of Prince of Wales Island and Baffin Island. Most of the territory rolling lowlands (mean elevation is 176 metres (577 ft)).

The ecoregion to the north is the 'High Arctic tundra' (colder and wetter), to the south is the Low Arctic tundra (warmer and wetter). [2] The bedrock under the western extent is Paleozoic and Mesozoic sedimentary rock with a relatively flat cover of glacial moraines and marine deposits. The eastern bedrock is older Precambrian granite, with rockier topography. Permafrost is continuous under the whole region, with depths up to hundreds of meters. [1] The northern islands are surrounded by pack ice most of the year.

Climate

The climate of the ecoregion is Tundra climate (Köppen climate classification ET), a local climate in which at least one month has an average temperature high enough to melt snow (0 °C (32 °F)), but no month with an average temperature in excess of 10 °C (50 °F). [6] [7] In this ecoregion, the mean summer month temperature ranges from 0.5 °C (32.9 °F) in the north to 4.5 °C (40.1 °F) in the south. Average annual precipitation is low, from 100-200 mm/year. Snow covers the ground for 10 months each year. [1]

Flora and fauna

The Middle Arctic Tundra is north of the treeline. 56% of the ground cover is moss and lichen, 30% is low herbaceous vegetation tolerant of the cold and dry environment, 1% is herbaceous wetlands, and up to 1% supports shrubs in protected areas. [1] Because of the harsh conditions—the cold, aridity, wind and poor, thin soils—vegetation is sparse and stunted. The rare protected area for shrubs is characterized by arctic willow ( Salix arctica ) and dwarf birch ( Betula ) and alder ( Alnus ); the herb cover by Saxifraga species and Dryas ). [4]

Characteristic mammals include barren-ground caribou ( Rangifer tarandus ssp. arcticus), muskox ( Ovibos moschatus ), wolf ( Canis lupus ), arctic fox ( Alopex lagopus ), polar bear ( Ursus maritimus , arctic hare ( Lepus arcticus , brown lemming ( Lemmus sibiricus ) and collared lemming ( Dicrostonyx groenlandicus ). The region supports up to 80% of the world's musk ox ( Ovibos moschatus ). [4]

The region supports important breeding and migratory grounds for birds, including snow goose ( Chen caerulescens ), brant ( Branta bernicla ), Canada goose ( Branta canadensis ), eider ( Somateria spp.) and oldsquaw duck ( Clangula hyemalis ). [4]

Protected areas

Over 5% of the ecoregion is officially protected. [3] These protected areas include:

See also

Related Research Articles

<span class="mw-page-title-main">Muskox</span> Arctic land mammal

The muskox, also spelled musk ox and musk-ox, plural muskoxen or musk oxen, is a hoofed mammal of the family Bovidae. Native to the Arctic, it is noted for its thick coat and for the strong odor emitted by males during the seasonal rut, from which its name derives. This musky odor has the effect of attracting females during mating season. Its Inuktitut name "umingmak" translates to "the bearded one".

<span class="mw-page-title-main">Arctic wolf</span> Subspecies of carnivore

The Arctic wolf, also known as the white wolf, polar wolf, and the Arctic grey wolf, is a subspecies of grey wolf native to the High Arctic tundra of Canada's Queen Elizabeth Islands, from Melville Island to Ellesmere Island. Unlike some populations that move between tundra and forest regions, Arctic wolves spend their entire lives north of the northern treeline. Their distribution to south is limited to the northern fringes of the Middle Arctic tundra on the southern half of Prince of Wales and Somerset Islands. It is a medium-sized subspecies, distinguished from the northwestern wolf by its smaller size, its whiter colouration, its narrower braincase, and larger carnassials. Since 1930, there has been a progressive reduction in size in Arctic wolf skulls, which is likely the result of wolf-dog hybridization.

<span class="mw-page-title-main">Baffin coastal tundra</span> Tundra ecoregion of Nunavut, Canada

The Baffin coastal tundra is a small ecoregion of the far north of North America, on the central north coast of Baffin Island in the Canadian territory of Nunavut. This is permafrost tundra with an average annual temperature below freezing.

<span class="mw-page-title-main">Taymyr Nature Reserve</span> Strict nature reserve in Krasnoyarsk Krai, Russia

Taymyr Nature Reserve is a Russian 'zapovednik' located in the northern lowlands of Siberia, on the Taimyr Peninsula, and on the coast of the Laptev Sea of the Arctic Ocean. The reserve includes the most northern forest of Dahurian larch in the world, and also the most northern mainland mountain range in the world. The protected area was established to protect the breeding grounds of the Red-breasted goose as well as the summer residences of wild reindeer and the biodiversity of the Lake Taymyr. The reserve is situated about 120 km east of the town of Norilsk, and 3,000 km northeast of Moscow, in the Taymyrsky Dolgano-Nenetsky District of Krasnoyarsk Krai. In 1995, the site was designated a UNESCO MAB Reserve. The reserve was formally established in 1979, and covers an area of 1,781,928 ha (6,880.06 sq mi).

<span class="mw-page-title-main">Northern Canadian Shield taiga</span> Taiga ecoregion in Canada

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 and tamarack, with some white spruce. The ecoregion lies over the northwestern extent of the Canadian Shield.

<span class="mw-page-title-main">Canadian Arctic tundra</span>

The Canadian Arctic tundra is a biogeographic designation for Northern Canada's terrain generally lying north of the tree line or boreal forest, that corresponds with the Scandinavian Alpine tundra to the east and the Siberian Arctic tundra to the west inside the circumpolar tundra belt of the Northern Hemisphere.

<span class="mw-page-title-main">Arctic desert</span> Ecoregion in Arctic Ocean

The Arctic desert ecoregion is a terrestrial ecoregion that covers the island groups of Svalbard, Franz Josef Land, Severny Island and Severnaya Zemlya in the Arctic Ocean, above 75 degrees north latitude. The region is covered with glaciers, snow, and bare rock in a harshly cold environment. The temperature does rise above freezing for short periods in the summer, so some ice melt occurs, and the area supports colonies of sea birds and mammals. It has an area of 161,400 square kilometres (62,300 sq mi).

<span class="mw-page-title-main">Chukchi Peninsula tundra</span> Ecoregion in Russia

The Chukchi Peninsula tundra ecoregion is an ecoregion that covers the northern coast of Russia along the East Siberian Sea, a marginal sea of the Arctic Ocean. The climate is somewhat milder than would be expected for its latitude, but the moderating effects of the East Siberian Sea and Bering Sea permits summer daytime temperatures above 50 °F (10 °C). Many colonies of migrating birds visit the area. The ecoregion is in the Palearctic realm, and tundra biome. It has an area of 298,367 square kilometres (115,200 sq mi).

<span class="mw-page-title-main">Taimyr–Central Siberian tundra</span>

The Taimyr-Central Siberian tundra ecoregion is an ecoregion that broadly covers the Taymyr Peninsula in the Russian Far North. It ranges from the delta of the Yenisei River in the west, across the Taymyr Peninsula and Khatanga Gulf, to the Lena River delta in the east. The region is an important area for breeding birds. It is in the Palearctic realm in the tundra biome, and is mostly located in Taymyrsky Dolgano-Nenetsky District of Krasnoyarsk Krai. It has an area of 954,670 square kilometres (368,600 sq mi).

<span class="mw-page-title-main">Yamal–Gydan tundra</span>

The Yamal–Gydan tundra ecoregion sprawls across the expansive Yamal Peninsula and Gydan Peninsula in the northern expanse of Russia. This unique ecoregion is characterized by its sparsely populated vegetation and wildlife, yet it holds great significance as a vital haven for migratory birds and coastal sea mammals. Embraced by the Palearctic realm and firmly entrenched in the tundra biome, it boasts an extensive area, covering approximately 412,067 square kilometers.

<span class="mw-page-title-main">Southern Hudson Bay taiga</span> Taiga ecoregion of Canada

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.

<span class="mw-page-title-main">Pacific Coastal Mountain icefields and tundra</span> Tundra ecoregion of Canada and the United States

Pacific Coastal Mountain icefields and tundra is a tundra ecoregion in Alaska, British Columbia, and Yukon, as defined by the World Wildlife Fund (WWF) categorization system.

<span class="mw-page-title-main">Davis Highlands tundra</span> Tundra ecoregion of Nunavut, Canada

The Davis Highlands tundra ecoregion covers the Baffin Mountains on the northeast coast of Baffin Island and Bylot Island, facing Baffin Bay in Nunavut, northern Canada. The terrain is extremely rugged, heavily glaciated, with many deep fjords, and very cold. About half of the territory is moss and lichen tundra, the other half bare rock and ice. The region is wetter than the much drier regions to the southwest of the Baffin Islands.

<span class="mw-page-title-main">High Arctic tundra</span> Tundra ecoregion of Nunavut and the Northwest Territories, Canada

The Canadian High Arctic Tundra ecoregion encompasses most of the northern Arctic archipelago, from much of Baffin Island, Somerset Island, and Prince of Wales Island in the south, through all islands northward to the most northern island in Canada, Ellesmere Island. Much of the northern islands are covered in ice, and the climate is very dry with as little as 50 mm/year in places. The ecoregion has very little human habitation, and most of the non-ice terrain is moss and lichen cover. The region supports viable populations of arctic mammals such as muskox, arctic wolves, arctic foxes, arctic hares, polar bears, and caribou.

<span class="mw-page-title-main">Kalaallit Nunaat high arctic tundra</span> Ecoregion in northeastern Greenland

The Kalaallit Nunaat high arctic tundra ecoregion covers the coastal areas of northern including the upper half of the west coast and the upper one-third of the east coast. Greenland. Areas inland of this strip of land are either covered in ice or bare rock. About one-third of the region is covered by mosses and lichens, and another 3% by herbaceous vegetation and shrubs. The largest national park in the world, Northeast Greenland National Park, protects a majority of the land within the ecoregion. The Pituffik Space Base is also located in this ecoregion.

<span class="mw-page-title-main">Kalaallit Nunaat Arctic Steppe</span>

The Kalaallit Nunaat Arctic Steppe ecoregion covers the low coastal areas of western and southern Greenland, reaching in up to 100 km before bare rock and ice become dominant. While much of the ecoregion is bare rock or ice, about 50% of the ground is covered in moss and lichen, and another 10% in herbaceous cover, shrubs, and even small stands of trees.

<span class="mw-page-title-main">Low Arctic tundra</span> Tundra ecoregion of Canada

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.

<span class="mw-page-title-main">Ogilvie–MacKenzie alpine tundra</span> Tundra ecoregion of Canada and the United States

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.

<span class="mw-page-title-main">Torngat Mountain tundra</span>

The Torngat Mountain tundra ecoregion covers the Torngat Mountains on the northeastern tip of the Labrador Peninsula where the provinces of Quebec and Newfoundland and Labrador meet. The mountains feature glacially carved U-shaped valleys and deep fjords. The vegetation over most of the territory is that of arctic tundra, herbaceous cover, or bare rock. The region supports seasonal polar bears, black bears, and caribou. The Atlantic coast is on the Atlantic Flyway for migratory birds.

<span class="mw-page-title-main">Kytalyk National Park</span>

Kytalyk National Park is a protected area for the Arctic breeding grounds of migratory birds on the East Asian–Australasian Flyway, including a significant portion of sites for the critically endangered Siberian crane. The name "kytalyk" is the Yakut-language word for the Siberian crane. The park is on the low-lying tundra of the delta of the Indigirka River, on the East Siberian Sea in northern Russia. The park was officially created in 2019. The park is located in Allaikhovsky District of the Sakha Republic.

References

  1. 1 2 3 4 5 "Middle Arctic tundra". World Wildlife Federation. Retrieved March 21, 2020.
  2. 1 2 "Map of Ecoregions 2017". Resolve, using WWF data. Retrieved September 14, 2019.
  3. 1 2 "Middle Arctic tundra". Digital Observatory for Protected Areas. Retrieved August 1, 2020.
  4. 1 2 3 4 "Middle Arctic tundra". The Encyclopedia of Earth. Retrieved August 28, 2020.
  5. https://www.oneearth.org/ecoregions/canadian-middle-arctic-tundra/
  6. Kottek, M.; Grieser, J.; Beck, C.; Rudolf, B.; Rubel, F. (2006). "World Map of Koppen-Geiger Climate Classification Updated" (PDF). Gebrüder Borntraeger 2006. Retrieved September 14, 2019.
  7. "Dataset - Koppen climate classifications". World Bank. Retrieved September 14, 2019.