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Low Arctic Tundra ECOREGION Forest Barren Tundra Bog L1 Low Arctic Tundra NF 1 he Low Arctic This is also the driest region in Labrador; TTundra ecoregion the average annual precipitation is only 500 mm, 2 is located at the very which occurs mainly in the form of snow. Not n o r t h e r n t i p o f surprisingly, human habitation in this ecoregion Labrador. It extends south from Cape Chidley to is limited and non-permanent. 3 the Eclipse River, and is bordered by Quebec on In most years, coastal ice continues well the west and the Labrador Sea on the east. This into summer (sometimes not breaking up until region is characterized by a severe, stark beauty: August), which is longer than anywhere else on 4 vast stretches of exposed bedrock, boulders, the Labrador coast. Permafrost is continuous in and bare soil are broken only by patches of the valleys and mountains inland, and moss and lichens. There are no trees or discontinuous in coastal areas. 5 tall shrubs here and other vegetation is The large amount of exposed soil and extremely limited. bedrock, combined with the harsh climate, 6 The topography of the Low Arctic results in sparse vegetation throughout the Tundra includes flat coastal plains in the entire ecoregion. Seasonal flooding also north near Ungava Bay, and low steep- restricts the distribution of plants on valley 7 sided hills in the south with elevation up to floors. Because this area has no forests, 630 metres above sea level. In hilly it is true tundra. Some marshes occur areas, exposed bedrock dominates along rivers; shrubs, where they do 8 the higher ground, while the steep Low Arctic occur, are low-growing. Grassy slopes are often covered with meadows occur in areas where 9 talus and alluvial fans. Tundra snow collects. No true The most northern of all the Ecoregion peatlands (bogs and fens) province's ecoregions, the Low Arctic occur in this ecoregion. LAB Tundra has the harshest climate. Summers are brief and cool, and winters 1 long and very cold. The average daily Tundra: Tundra landscape occurs around the Arctic temperature for February is in the low -20s; for Circle, north of the treeline, and in smaller areas in 2 July it's 6 C to 7 C. Due to its high latitude this the southern hemisphere on sub-Antarctic islands. ecoregion also experiences the greatest It can also occur above the treeline on high changes in the number of daylight hours. At Cape mountains, even in the tropics. These areas usually 3 have a very short growing season, and only cold- Chidley on the longest day of the year — in June tolerant plants — such as mosses, sedges, lichens, — there are 19 hours of daylight, with almost no and dwarf trees — can survive. Typical tundra 4 real darkness during the night. On the shortest animals are musk ox, lemmings, voles, snowshoe day of the year — in December — there are only hare, and caribou — or reindeer. about six hours of daylight. 5 Ecoregion: An area that has Talus: The collection of rock and Ericaceous: A scientific term distinctive and repeating patterns of rubble that forms at the base of a referring to a family of low shrubs that 6 vegetation and soil development, slope as material erodes off the grow in acidic soils and have leathery which are determined and controlled mountainside above. Commonly leaves and bell-shaped flowers. by regional climate. Ecoregions can known as "scree." Some of the many Labrador plants 7 be distinguished from each other by that belong to this group — which is their plant communities, landscapes, Alluvial fan: The fan-like landform also known as the "heath family" — geology, and other features. These created where a stream flows out into are blueberry, partridgeberry, characteristics, in turn, influence the a valley, slows its current, and dumps crowberry, and sheep laurel. 8 kinds of wildlife that can find suitable the heaviest sediment it was carrying habitat within each ecoregion. — primarily coarse gravel. They are common in mountainous areas. 9 Check your public library for a full set (36) of these booklets: one introductory document and one for each of the 35 ecoregions and subregions in the province. For more information about the series see page 4. 10 Landscape Profile Low Arctic Tundra 630 m alpine heath moss heath snowbed communities Soils: Soils here are poorly developed with rocklands dominating the landscape. The last glaciation removed most of the soil from this ecoregion, leaving only scattered till deposits and bare marsh ocean rock. Sea Level Geology: The rocks of Labrador are much older than the rocks found in Newfoundland. In fact, most of the rocks found here are the oldest in the province and among the oldest in the world! They were created about 3.8 billion years ago when the earth was very young — even before multi-cellular life existed on the planet. This was a time when oxygen levels in the atmosphere were extremely low and the most common form of life was anaerobic bacteria (bacteria that doesn't require oxygen for growth). Rocks in this ecoregion are part of the Churchill Province, which covers the western and northern tip of Labrador. They consist mainly of gneisses and other metamorphic rocks, intruded in certain areas by a rock called anorthosite. distinctly fuzzy appearance and is alpine areas where snow Vegetation soft to the touch. It has a very continues late into the growing Profile restricted distribution and can be season. This longer-lasting snow found in only a few places in North cover provides protection for his ecoregion's classification America. In northern Labrador, plants, as well as extra moisture as Tas tundra means it is above heath moss grows in association the snow melts. Dwarf willow and the treeline. (Although forests with various lichens, willows, mountain heather are examples of often grade unevenly into tundra, crowberries, and ericaceous plant species found in snow-bed the treeline refers to those regions plants. communities in northern Labrador. above which trees do not grow.) Snow-bed communities Because they often contain a lot of Although some scattered thickets occur occasionally in the Low sedges, snow-bed communities of low-growing willow and alder Arctic Tundra ecoregion. These are also known as sedge occur here, no coniferous trees are are specific plant groupings in meadows. found. In fact, due to the short g r o w i n g s e a s o n , c o o l temperatures, and large expanses n of exposed rock, much of this o i s i ecoregion is characterized by bare v i D ground where nothing grows. s a e These areas are often broken by r A patches of lichen and mosses, l a r while sedges, crowberries, and u t a ericaceous plants such as alpine N d bearberry occur sporadically. Not n a s surprisingly, where more extensive n k a r y a vegetation occurs, it is on the R P : n o warmer south-facing slopes and in e l t o G protected ravines. h A P : N e a r t h e c o a s t , o n o Species in Focus: Pink crowberry (Empetrum eamesii) is one of three t o exposed headlands and ledges, h species of crowberry that grow in exposed areas of Newfoundland and P heath moss (Rhacomitrium Labrador (the other two are black and purple crowberry). Crowberries are lanuginosum) occurs, although it low-growing, compact, mat-like evergreen plants. Of the three species, does not cover extensive areas the pink crowberry is the most common in dry, exposed places such as rock way it does in the Eastern Hyper- ledges, hilltops, and dry barrens. In the Low Arctic Tundra where oceanic Barrens ecoregion on the vegetation cover is sparse, pink crowberry is one of only a handful of plants Island. Heath moss is a low, dense, that manage to survive, forming thick cushions that alternate with patches dark grey-green moss that has a of bare soil. 2 Low Arctic Tundra ecoregion Wildlife Profile n o i s i v i ome of the largest arctic D s mammals occur in the Low a S e r Arctic Tundra ecoregion, including A l a the polar bear, and in coastal r u t waters, the narwhal and walrus. a N The walrus is a large sea mammal d n a with two white tusks, which it uses s k to loosen food from the sea bottom. r a P It is an uncommon marine mammal : o t in this ecoregion, but can be seen o h occasionally resting on ice pans. P The narwhal is the only tusk- Species in Focus: An arctic species, designated as special bearing whale. This tusk (which is concern, the massive, white to pale yellow polar bear lives year- actually a very long tooth and round along the coast of the Low Arctic Tundra ecoregion. It occurs only in the male) projects feeds mostly on seals, though it will also eat fish, invertebrates, through the upper lip and twists in a some vegetation, and the eggs and young of waterfowl and clockwise direction as it grows, seabirds. Polar bears are strong swimmers, and can swim for forming a spiral. The first narwhal hundreds of kilometers without coming onto land. tusks to reach Europe were thought to belong to a horse-like such as common eiders and common eider leaves her nest for animal, and thus became the basis scoters. The males of these only ten to fifteen minutes every for the medieval unicorn myth.
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