- Hudson Plains
The Hudson Plains is a sparsely populated Canadian subarctic ecozone extending from the western coast of
Quebec to the coast ofManitoba , encompassing all coastal areas ofJames Bay and those of southernHudson Bay . It is the largest continuouswetland in the world.Cite web
url=http://canadianbiodiversity.mcgill.ca/english/ecozones/hudsonplains/hudsonplains.htm
title=Hudson Plains
work=Canada's Ecozones, Canadian Biodiversity project
last=Bernhardt
first=Torsten
publisher=McGill University , Redpath Museum
accessdate=2008-02-01] It covers nearly a quarter ofOntario 's landmass, and 3.6% of Canada's total area,Cite web
url=http://www.environnement-canada.ca/soer-ree/English/SOER/1996report/Doc/1-6-2-4-1.cfm
title=The State of Canada's Environment — 1996
publisher=Environment Canada
accessdate=2008-02-01] totalling approximately 369,000 square kilometres of land and 11,800 square kilometres of water.Cite web
url=http://www.ec.gc.ca/soer-ree/English/Vignettes/Terrestrial/hp/default.cfm
title="The Wetlands"
work=Hudson Plains Ecozone
publisher=Environment Canada
accessdate=2008-02-01]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-knownPolar Bear Provincial Park , and to a lesser extentWapusk National Park , as well as its vast wetlands which are used by migratory birds.Geography
The
Palaeozoic andProterozoic sedimentary deposits overlaying thebedrock have formed into a wide and level plain characterised byraised beach es andriver delta s,Cite web
url=http://www.gov.mb.ca/conservation/annual-report/soe-reports/soe97/soe97.html
title=State of the Environment Reports
publisher=Manitoba Environment
date=1997
accessdate=2008-02-01] with an elevation rarely exceeding 120 m.Cite web
url=http://www.eco.on.ca/english/aboutont/hudson.htm
title=Hudson Plains
work=The Ecozones of Ontario
publisher=Environmental Commissioner of Ontario
accessdate=2008-02-01] The relatively flat land slopes gently toward the two bays, which act as adrainage basin for the region. However, the relatively poor drainage system has spurred the natural development of numerouswetland s. It is encircled by theCanadian Shield , with which it overlaps in a few areas to the east and west.Cite web
url=http://www.bsc-eoc.org/international/bcrs/7.html
format=
title=Taiga Shield & Hudson Plains
work=Canadian Bird Conservation Regions
publisher=Bird Studies Canada
accessdate=2008-02-01]To its north is the cold
Arctic Archipelago Marine ecozone, and to the south is the milderBoreal Shield . Hence, this ecozone is transitional, which is easily evident as it transforms from barrentundra in the north to opentaiga forest s in the south. These forests resemble those of theboreal zone, with sparservegetation .Thousands of depressions carved by retreating
glacier s have becomelake s and wetlands. The Hudson Plains is also noted forcoastal marsh es and extensivetidal flat s, withtidal marsh es along the coast of Hudson Bay. Belts ofraised beach es are evident where rebound from glacier retreat is most prominent.Climate
The ecozone has a
subarctic climate which is significantly influenced by the adjacent marine area of Hudson Bay, which features cold and moisture-laden low-pressure systems.Cite web
url=http://www.pc.gc.ca/apprendre-learn/prof/itm2-crp-trc/pdf/ecozone08_e.pdf
format=PDF
title=Hudson Plains Ecozone
publisher=Parks Canada
date=Autumn 2003
accessdate=2008-02-01] Frigid polar high-pressure air masses commonly reach the area. Typically cold, mean January temperatures are near -19°C, and mean July temperatures range between 12°C and 16°C. The region experiences moderate precipitation, between 400 mm to 700 mm annually.Summer s are cool and relatively short, with prolonged daylight, while winters are very cold.Fauna and flora
Referred to as an "insect-infested landscape of
bog andfog ", it teems with largeinsect populations that are a food source for migratory waterbirds. The Hudson Plains have become "notorious for their populations of biting insects". 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.Cite web
url=http://www.wildaboutgardening.org/en/growing/section3/ecozone_map/index.htm
title=Ecozones
publisher=Canadian Wildlife Federation
accessdate=2008-02-01]Alder ,willow ,black spruce andtamarack are the most common plant species in the treed bogs andfen s of the Hudson Plains, whereassphagnum andshrub s such ascrowberry andblueberry dominate the open bogs to the north, withwhite spruce appearing further south. Poorly drained areas produce dense sedge, moss and lichen cover.The Hudson Plains also represent the southern extent of the
polar bear s yearly migratory route, which reaches the northwestern coast of Ontario. The bears then follow the Hudson Bay coast toward Churchill,Manitoba .Mammal s such asmoose ,woodland caribou and black bears are comfortable in this environment, but smaller mammals are more common, includingmuskrat s,weasel s,arctic fox es,marten s, and fishers.The adjacent marine ecozone of the Arctic Archipelago Marine supports mammal populations of
walrus and Bearded, Harbour and Ringed seals.Millions of migratory shorebirds stage and nest in multiple areas of the Hudson Plains, particularly in three areas within
Southern James Bay :Akimiski Island , and the migratory bird sanctuaries atHannah Bay and the mouth of the Moose River. Representative species include theSnow Goose ,Canada Goose ,King Eider ,swan ,loon ,Gyrfalcon , andPeregrine Falcon .References
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