Entirely located in Canada, the Southern Hudson Bay taiga covers an area of approximately 373,735 square kilometres (144,300 sq mi) and crosses the provinces of Manitoba, Ontario, and the western portion of Quebec.[2] Various islands in James Bay which belong to Nunavut are also considered to be part of the ecoregion. It includes the largest continuous wetland in the world.[3] It covers nearly a quarter of Ontario's landmass, and 3.6% of Canada's total area,[4][5]
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.[5] 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 Palaeozoic and Proterozoicsedimentary deposits overlaying the bedrock[3] have formed into a wide and level plain characterised by raised beaches and river deltas,[8] with an elevation rarely exceeding 120 m.[9] The relatively flat land slopes gently toward the two bays, which act as a drainage basin for the region. However, the relatively poor drainage system has spurred the natural development of numerous wetlands. It is encircled by the Canadian Shield, with which it overlaps in a few areas to the east and west.[10]
The ecoregion has a subarctic climate under the Köppen-Geiger climate classification system and is significantly influenced by the adjacent marine area of Hudson Bay, which features cold and moisture-laden low-pressure systems.[11] Typical seasonal conditions in the Southern Hudson Bay taiga consist of brief, cool summers with significant daylight, and cold winters with prolonged darkness.[12] Frigid polar high-pressure air masses commonly reach the area. Average temperatures range from 10.5°C to 11.5°C during summer months, -19°C to -16°C during winter months, and -5°C to -2°C throughout the year. Precipitation levels vary greatly within the region due to differences in temperature, with the eastern and western areas receiving an annual average of 500-800 mm and the northern areas as little as 400 mm.[1][11]
Flora and fauna
Referred to as an "insect-infested landscape of bog and fog",[5] it teems with large insect populations that are a food source for migratory waterbirds.[9] The Hudson Plains have become "notorious for their populations of biting insects".[3] Vegetation is somewhat limited, with the northern areas abutting the Arctic Archipelago Marine being nearly treeless, whereas the southern extent, adjacent to the Boreal Shield, have open forest.[13]Alder, willow, black spruce and tamarack are the most common plant species in the treed bogs and fens of the Hudson Plains,[10][13] whereas sphagnum and shrubs such as crowberry and blueberry dominate the open bogs to the north,[8][13] with white spruce appearing further south. Poorly drained areas produce dense sedge, moss and lichen cover.[10]
Belonging to the circumborealfloristic region, the Southern Hudson Bay taiga contains a total of 1178 different plant species – none of which are considered endemic to the area.[15] The major plant communities in this ecoregion, which are characteristic of the taigabiome, primarily consist of black spruce (Picea mariana) and tamarack (Larix laricina) forests. Species which commonly dominate the forest undergrowth are birch (Betula), willow (Salix), and marsh Labrador tea (Rhododendron tomentosum). Due to the tundra conditions in the northern extent of the region, a latitudinal gradient of plant biodiversity exists which increases towards the south. Wetlands in this ecoregion are estimated to occupy between 50 and 75% of the land area.[1]
With an average population density estimated at less than 1 person/km2, the majority of the human population in the Southern Hudson Bay taiga is concentrated in a number of smaller towns and communities located along the southern coast of Hudson Bay.[15] These include Churchill, Moosonee, and Moose Factory as well as the First Nation communities of Fort Severn, Fort Albany, and Attawapiskat. Much of the ecoregion is the traditional territory of the Cree, Dene, Inuit, and Métis peoples.[16] The region also witnessed the development of the Hudson's Bay Company during the 17th century and played an integral role in the North American fur trade. It was part of a larger area referred to as Rupert's Land in which the Hudson's Bay Company had exclusive commercial rights until it was sold to the Canadian government in 1870.[17]
Conservation and threats
The World Wildlife Fund has classified the conservation status of the ecoregion as relatively stable/intact as a result of its sparse, low-impact human presence. It is therefore not part of the WWF's Global 200 list of ecoregions most in need of conservation efforts. Approximately 9.32% of all lands in the Southern Hudson Bay taiga are considered protected including Polar Bear Provincial Park, Wapusk National Park, and Jog Lake Conservation Reserve. As a result of its more northern latitude, the area is not subject to intense logging or deforestation pressures. The primary conservation concerns for the region surround the proposed hydroelectric projects near James Bay and the regulation of hunt camps.[1] Estimates indicate that the Southern Hudson Bay taiga will experience an increase in temperature of 3.39°C and an increase in precipitation of 13.32 mm by 2050 as a result of climate change.[15]
^ abcde"Hudson Plains". The Ecozones of Ontario. Environmental Commissioner of Ontario. Archived from the original on 2007-09-23. Retrieved 2008-02-01.
