Ecosystems: Cold Environments & Biodiversity — GCSE Geography Revision

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What is Ecosystems: Cold Environments & Biodiversity?

Cold environments, including polar regions (like Antarctica) and tundra (like northern Canada), are characterized by extremely low temperatures, low precipitation, and a short growing season. Biodiversity is low, and the plants and animals that live there, such as polar bears and lichens, have specific adaptations to survive the harsh conditions. These environments are incredibly fragile and are under threat from climate change and human activities like oil exploration.

Board notes: Both polar and tundra environments are studied across AQA, Edexcel, and OCR, often as contrasting ecosystems to hot deserts or rainforests. Focus is on adaptations, development opportunities (e.g., tourism, energy), and the challenges of sustainable management.

Worked example

Common mistakes

• 1Thinking the Arctic and Antarctic are the same. The Arctic is a frozen ocean surrounded by land, while the Antarctic is a continent of land covered by a massive ice sheet. The Antarctic is significantly colder and has different wildlife (e.g., penguins but no polar bears).
• 2Assuming tundra is always covered in snow and ice. Tundra is characterized by permafrost (permanently frozen ground), but the surface layer thaws in the short summer, allowing low-growing plants like mosses, grasses, and dwarf shrubs to grow.
• 3Believing these environments are barren and lifeless. While biodiversity is low compared to a rainforest, cold environments support complex food webs, from plankton in the Southern Ocean to caribou and wolves in the tundra, all highly adapted to the extreme cold.

Ecosystems: Cold Environments & Biodiversity exam questions

Exam-style questions for Ecosystems: Cold Environments & Biodiversity with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel and OCR specifications.

Frequently asked questions

• What is permafrost?

  Permafrost is a layer of soil, rock, or sediment that is frozen for more than two consecutive years. In tundra environments, the 'active layer' at the surface thaws in summer, but the ground beneath remains frozen. Climate change is causing permafrost to thaw, releasing large amounts of methane, a potent greenhouse gas.

• Why are cold environments considered fragile?

  Cold environments are fragile because their ecosystems are slow to recover from damage. The short growing season and low temperatures mean that plant growth is very slow, so damage from vehicle tracks or oil spills can remain for decades or even centuries.