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Northern Arctic High Arctic-Oceanic (Hao) Ecoregion Harshest Climates in the Northern Arctic

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Northern Arctic High Arctic-Oceanic (Hao) Ecoregion Harshest Climates in the Northern Arctic The purple saxifrage (Saxifraga oppositifolia) is one of very few herbs that can survive the ECOLOGICAL REGIONS Northern Arctic High Arctic-oceanic (HAo) Ecoregion harshest climates in the Northern Arctic. Its tiny, waxy leaves and low-growing cushion The ice pack is an important component of growth form reduce its exposure to wind the Northern Arctic ecosystem, supporting The Northern Arctic High Arctic-oceanic (HAo) Ecoregion occupies about 22,300 km2, and includes two Level IV ecoregions on all or and damaging ice crystals, and maximize its ice specialists such as the Polar Bear (Ursus OF THE use of a meagre water supply. maritimus). The crack in the ice is an open parts of four main islands and several smaller islands in the extreme northwest of the Canadian Arctic Archipelago. The islands included water lead, the blue patches are meltwater ponds from which water evaporates and within the Ecoregion are nearly level to gently rolling, and are surrounded by multi-year pack ice. The Ecoregion is a polar desert where condenses to form the low stratus cloud and NORTHWEST TERRITORIES fog layer typical of the northern islands in vegetation (tundra) is restricted to small areas because of the extremely dry and cold conditions; only cushion forbs, a few dwarf grasses summer. Some ocean areas called polynias, and crusts composed of algae, lichens and bacteria are found here. This Ecoregion was covered by ice in the most recent Laurentide have open water year-round. Several species Polar Islands of ducks, loons, gulls and jaegers depend on glaciations and the islands were then partly submerged along their coastlines as the ice melted and ocean waters flooded over lands open leads and polynias in offshore sea ice HAo for migration pathways and food. NORTHERN ARCTIC that had been depressed by the weight of overlying ice sheets. Permafrost is continuous. There is a dense drainage network, but most streams are ephemeral or intermittent with only a few narrow, shallow permanent creeks and rivers. A few small ponds and semi- Photo: R. Decker permanent snow patches are scattered throughout and provide seasonal water sources. Polar Islands Photo: D. Downing HAo Mackenzie King Island is sparsely vegetated and mostly low-lying. Part of its interior is occupied by a barren eolian (windblown sand) plain that has eroded bedrock exposures in places. Castle Butte, about 30-m high, is capped by erosion-resistant bedrock. Cryptogams are a type of semi-barren landscape found in the coldest, driest places of the Northern Arctic. The blackish The northern halves of Brock and crusts are lichens, mosses, algae and Borden Islands are sand and gravel Photo: R. Decker bacteria with a few scattered cushion- lowlands criss-crossed by hundreds form herbs, such as purple saxifrage of shallow drainages, only a few of (Saxifraga oppositifolia), arctic poppy which have any water in summer. (Papaver spp.), and rushes (Luzula spp.). Darker patches seen in this picture -hoto: D. Downing Photo: R. Decker There are no shrubs. are cryptogams. Photo: D. Downing Polar Islands HAo Northern Arctic High Arctic (HA) Ecoregion North Photo: D. Downing Melville The Northern Arctic High Arctic (HA) Ecoregion occupies about 45,600 km2, and includes six Level IV ecoregions on most of Melville Upland HA Photo: D. Downing Island, Eglinton Island, part of Prince Patrick Island and the extreme northwest and northeast corners of Banks Island. Pack ice surrounds most of the Ecoregion year-round, although this is changing rapidly. Tundra is absent or limited at high elevations and on bouldery or Coastal Plain A Melville M excessively well-drained sites. This Ecoregion has a climate only slightly less extreme than that of the more northerly High Arctic-oceanic n i MA a Ecoregion. The highest terrain in the Northwest Territories Northern Arctic occurs on central Melville Island (755 m above sea level). This l P l a Ecoregion has several remnant ice caps; a reminder that it was covered by ice in the most recent glaciation. Permafrost is continuous. t Photo: R. Decker Healthy natural s a ecosystems are critical Tundra including low-growing willows (Salix sp.) and mountain avens (Dryas integrifolia) occurs in warmer microclimates such as in o This Ecoregion is the northern C e limit of the shrub-line, where to our well-being; they protected valleys and on calcareous soils. Tundra with sedges, grasses, and mosses is widespread on wet lowlands and seepage slopes. ll Photo: D. Downing i Photo: R. Decker Arctic willow [Salix arctica) lv Arctic hares select boulder strewn provide us with clean e will grow but is restricted to hilly habitats that provide shelter M Bright red shales cover parts of western Melville Parallel meltwater rivulets cross the surface warm sites. from severe weather and escape from air and clean water, a Peary caribou are the smallest Island. The colouration is thought to be the of Leopold Glacier, the largest of the predators. Arctic willow is the main North American caribou and are result of spontaneous combustion millions remnant glaciers on Melville Island. wide range of renewable winter food for these hares, and the found only in the high Arctic. of years ago, perhaps in low-grade coals diet becomes more diverse in summer resources, and the Their populations declined in associated with the shales. opportunity to enjoy the 1960s-1970s because of consisting mainly of legumes. harsh winters, and other factors landscapes with their such as hunting, predation, and rich diversity of plant competition with muskoxen. Theirs numbers are now stable and animal communities. but still low. They were listed as Climate and topography endangered under the federal Parker Plateau on the northeast corner of Species at Risk Act in 2011. Melville Coastal Plain MA act together to produce Banks Island is capped by frost-shattered ecosystems that can limestone, here exposed as small cliffs. Talus slopes below the cliffs are too range in size from lichen bouldery for plant growth and the upper communities on a piece of granite to landscapes the size of Great Slave plateau is very dry with areas of barren MelvillePlain Coastal MA Rock Ptarmigans spend to very sparse tundra, but the lower their entire life cycle in the Lake. Understanding what makes one area different from another is an valley slopes receive seepage waters and Arctic, retreating only from important part of wisely managing the vast expanses of the Northwest have finer-textured soils that support northernmost islands during Photo: D. Downing Photo: D. Downing continuous tundra (green tones). Photo: R. Royse the winter. Territories for present and future generations. These differences can be described by dividing larger landscapes into smaller areas that have unique combinations of climate, terrain, vegetation, soils and wildlife; these are called ecological regions (ecoregions). Gyrfalcon Bluff in the Thomsen Valley Diverse landscapes and on Banks Island is an outlier of the abundant vegetation on the The Northwest Territories developed an ecologically-based landscape Northern Arctic Mid-Arctic (MA) Ecoregion same limestone formation that lowlands provides excellent underlies the Parker Plateau to the habitat for many mammals classification for environmental assessment, cumulative effects east. The cliffs are occupied by and birds, such as Arctic management, biodiversity monitoring and reporting, forest resource 2 nesting gyrfalcons, the official foxes, muskoxen, wolves and The Northern Arctic Mid-Arctic (MA) Ecoregion occupies almost 134,000 km , and includes 11 Level IV ecoregions bird of the Northwest Territories. nesting and brood rearing analysis and planning, wildlife habitat evaluation and conservation, on most of Banks and Victoria Islands and sheltered coastal areas on Melville Island. This Ecoregion has a somewhat This landscape is part of Aulavik habitat for lesser snow geese. and protected area identification. Such a classification is essential for National Park. responding to local, regional, national and international enquiries, and more moderate climate than the High Arctic Ecoregion. Banks and Victoria islands portions of this Ecoregion the Northwest Territories is working with other Canadian provinces and have distinctly different topography and geology. Banks Island has gently undulating terrain of sands and territories to use a North American continental approach to improve its gravels, blanketed by weathered low-relief tills and extensive fluvial plains, and several large rivers flowing ecological classification. Because of a rapidly changing climate and the west and north in broad shallow valleys with many shallow ponds. Along the south-eastern coast of Banks increasing pace of landscape changes in the northern-most regions of the Island, Palaeozoic and Precambrian bedrock outcrops form spectacular cliffs. The terrain on Victoria Island Northwest Territories it was important to update the description of these Photo: D. Downing Photo: R. Decker is of calcareous Cambrian to Silurian sedimentary rock surrounding the Shaler Mountains, a high central Ill u ecosystems as a benchmark for future monitoring. This poster, describing st ra ti on : spine of dissected Precambrian volcanic and intrusive bedrock ridges and plateaus underlain by eroding Go the Northern Arctic Ecological Region, completes the set of five posters rd on Co and accompanying reports that cover the entire Northwest Territories. Precambrian sedimentary rocks. Two main tundra types occur here: upland sites have shrub tundra urt and wetter lowland sites develop continuous sedge – grass – moss tundra. The central and western Ecological classification and mapping for the Northern Arctic are portions of Banks Island include the most productive tundra in this Ecoregion. Red Knots are the largest sandpiper presented within an ecoregion framework for continental North America in the Northern Arctic and undergo some of the longest migrations. that includes four levels, from very large Level I ecoregions that represent They have been found nesting on ecosystems of global extent to relatively small Level IV ecoregions rock plains with scant vegetation on Melville, Eglinton and Prince Patrick that represent ecosystems of several thousand square kilometers.
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