Tundra: Quick Facts

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What is a tundra ecosystem?

A tundra is a treeless biome in cold regions, typically north of the Arctic Circle (Arctic tundra) or above the timberline of high mountains (alpine tundra). It features large expanses of bare ground and low vegetation like mosses, lichens, herbs, and small shrubs, supporting unique animal life.

Tundra ecosystems have simple food chains that are vulnerable if a species declines. Though they have fewer species overall, many are unique to these areas, making tundra important for global biodiversity. Bacteria and fungi are also plentiful, playing a vital role in the ecosystem through nutrient regeneration and the carbon cycle.

Rolling tundra in Alaska with red, yellow, and green fall foliage, set against rugged mountains with patches of grass and exposed rock. — tundra Alaskan mountain and tundra vegetation in the fall.

tundra Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Biological productivity Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Effects of human activities and climate change Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Arctic mammals Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Distribution Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg Arctic: Vegetation Arctic, northernmost region of Earth, centred on the North Pole and characterized by distinctively polar conditions of climate, plant and animal life, and other physical features. The term is derived from the Greek arktos (“bear”), referring to the northern constellation of the Bear. It has https://cdn.britannica.com/53/5853-004-FF0BE165/North-Pole.jpg

Where are tundra ecosystems found in the world?

Tundra ecosystems are located in the northern hemisphere between 60° and 75° latitude, mainly along the Arctic coast of North America and Eurasia, and on the coastal margins of Greenland. The southern limit of Arctic tundra is along the northern edge of the coniferous forest belt, above latitude 60° N in North America and mostly north of 70° N in Eurasia.

Alpine tundra, covering about 3% of Earth’s land, exists in mountainous regions globally at high elevations where trees cannot grow due to low temperatures and strong winds. Because nearly all of Antarctica is covered with ice, it lacks a well-developed tundra, though lichens, mosses, and a few flowering plants can be found in favorable habitats there.

tundra: Distribution Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra climate Tundra climate, major climate type of the Köppen classification characterized by sub-freezing mean annual temperatures, large annual temperature ranges (but not as large as in the adjacent continental subarctic climate), and moderately low precipitation. The tundra climate region occurs between 60° https://cdn.britannica.com/26/5926-050-CCE05707/surface-permafrost-tundra-Siberia-Taymyr-Peninsula.jpg tundra: Effects of human activities and climate change Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Plant life Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg Arctic: Vegetation Arctic, northernmost region of Earth, centred on the North Pole and characterized by distinctively polar conditions of climate, plant and animal life, and other physical features. The term is derived from the Greek arktos (“bear”), referring to the northern constellation of the Bear. It has https://cdn.britannica.com/53/5853-004-FF0BE165/North-Pole.jpg

What is the climate like in the tundra?

The tundra climate is characterized by sub-freezing mean annual temperatures and moderately low precipitation. It is located between 60° and 75° latitude, mainly along the Arctic coast of North America and Eurasia, and on Greenland's coastal margins.

Winters are long and cold, with temperatures potentially below 0 °C (32 °F) for 6–10 months. Winter precipitation is mainly dry snow. Summers are generally mild, with daily maximum temperatures from 15 to 18 °C (59 to 64 °F). Annual precipitation typically totals less than 35 cm (about 14 inches), but can range from 25 to 100 cm (10 to 39 inches). Though snow cover melts in the warmer season, frost and snow are possible in any month.

tundra climate Tundra climate, major climate type of the Köppen classification characterized by sub-freezing mean annual temperatures, large annual temperature ranges (but not as large as in the adjacent continental subarctic climate), and moderately low precipitation. The tundra climate region occurs between 60° https://cdn.britannica.com/26/5926-050-CCE05707/surface-permafrost-tundra-Siberia-Taymyr-Peninsula.jpg tundra: Effects of human activities and climate change Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Soils Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Climate Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg

Which plants and animals live in the tundra ecosystem?

The tundra is home to a limited number of plant and animal species, but the number of individuals per species is often high. Many tundra species are unique to this biome, making it an important contributor to global biodiversity.

Typical animals of the Arctic tundra include the polar bear ( Ursus maritimus), Arctic fox (Alopex lagopus), Arctic wolf (Canis lupus), Arctic hare (Lepus arcticus), lemmings and ptarmigan (Lagopus). The characteristic large herbivores of the Arctic tundra are the reindeer (Rangifer tarandus) and the musk ox (Ovibos moschatus). Most tundra birds are migratory, but the ptarmigan is an exception.

Tundra vegetation includes lichens, mosses, sedges, cotton grass, low willows, grasses, and rushes.

tundra: Arctic mammals Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Plant life Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Soils Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Effects of human activities and climate change Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg Arctic: Vegetation Arctic, northernmost region of Earth, centred on the North Pole and characterized by distinctively polar conditions of climate, plant and animal life, and other physical features. The term is derived from the Greek arktos (“bear”), referring to the northern constellation of the Bear. It has https://cdn.britannica.com/53/5853-004-FF0BE165/North-Pole.jpg tundra: Biological productivity Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Birds Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg

How do plants and animals survive in harsh tundra conditions?

In the harsh tundra, plants and animals have unique adaptations for survival. Plants stay low to the ground to avoid strong winds and conserve heat, and many are perennials, maximizing the short growing season. They flower quickly and some can even continue to develop seeds after freezing.

Animals like musk oxen have thick coats to retain heat, while others such as arctic hares and ptarmigans, change color with the seasons for camouflage. Small mammals, such as lemmings, reproduce quickly, and some remain active under the snow during winter. Migratory birds and mammals leave during the winter, while those that stay have developed strategies to conserve energy and find food in the challenging environment.

tundra: Arctic mammals Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Plant life Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg tundra: Effects of human activities and climate change Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg Arctic: Vegetation Arctic, northernmost region of Earth, centred on the North Pole and characterized by distinctively polar conditions of climate, plant and animal life, and other physical features. The term is derived from the Greek arktos (“bear”), referring to the northern constellation of the Bear. It has https://cdn.britannica.com/53/5853-004-FF0BE165/North-Pole.jpg tundra: Alpine mammals Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as https://cdn.britannica.com/81/143481-050-05DDC0A8/mountain-Alaskan-vegetation-tundra-fall.jpg polar ecosystem: Biological productivity Polar ecosystem, complex of living organisms in polar regions such as polar barrens and tundra. Polar barrens and tundra are found at high latitudes on land surfaces not covered by perpetual ice and snow. These areas lying beyond the tree line comprise more than 10 percent of the Earth’s land https://cdn.britannica.com/94/6594-004-0B232F2C/limit-tundra-line-Arctic-demarcation-Low.jpg

How are human activities and climate change affecting tundra ecosystems?

Human activities and climate change significantly impact tundra ecosystems. Construction, mining, and resource extraction disrupt landscapes and pollute the environment, threatening wildlife habitats. Climate change, amplified in the Arctic, causes earlier spring thaws and later autumn freezes, diminishing habitats for native animals.

The melting of permafrost, containing vast amounts of organic matter, leads to the release of greenhouse gases like CO2 and methane, further exacerbating global warming. These changes affect the integrity and sustainability of tundra ecosystems, demanding urgent attention from scientists and policymakers.