key term - Tundra

Definition

Tundra is a unique biome characterized by its cold temperatures, low precipitation, and a short growing season. This biome typically has permafrost, a permanently frozen layer of soil beneath the surface, which significantly influences its vegetation and animal life. The tundra supports a variety of hardy plants and animals that have adapted to survive in extreme conditions, making it an essential ecosystem within the broader context of terrestrial biomes.

5 Must Know Facts For Your Next Test

1. Tundras are primarily found in high-latitude regions, including parts of Alaska, Canada, Russia, and Greenland.
2. The growing season in the tundra is extremely short, often lasting only 50 to 60 days each year, due to long winters and cool temperatures.
3. Vegetation in the tundra is limited mainly to mosses, lichens, low shrubs, and grasses that can withstand the cold and short growing season.
4. Animal species that inhabit the tundra include migratory birds, caribou, arctic foxes, and polar bears, all adapted to survive in this harsh environment.
5. Climate change poses a significant threat to tundra ecosystems as it leads to permafrost thawing, which can release greenhouse gases and alter habitats.

Review Questions

• What adaptations do plants and animals in the tundra biome exhibit to survive in such extreme conditions?
  • Plants in the tundra have adaptations like shallow roots to avoid permafrost and growth patterns that allow them to take advantage of the brief growing season. Many are low-growing and cushion-like to resist cold winds. Animals such as caribou have thick fur for insulation, while migratory birds time their breeding with the short summer when food is plentiful. These adaptations are crucial for their survival in an environment with harsh weather and limited resources.
• Compare and contrast the tundra with the taiga biome in terms of climate, vegetation, and wildlife.
  • The tundra is characterized by its cold climate with low precipitation and permafrost, leading to limited vegetation mostly comprised of mosses and lichens. In contrast, the taiga has a slightly milder climate with more precipitation, allowing for coniferous forests to thrive. Wildlife in the tundra includes species adapted for extreme cold like polar bears and migratory birds, while the taiga supports larger mammals such as moose and bears that rely on the forest environment for shelter and food.
• Evaluate the impact of climate change on tundra ecosystems and discuss potential consequences for global biodiversity.
  • Climate change is significantly impacting tundra ecosystems through permafrost thawing, which releases stored carbon dioxide and methane into the atmosphere. This not only accelerates global warming but also disrupts local habitats for plants and animals. As temperatures rise, species may migrate northward or become endangered, reducing biodiversity. The loss of this unique ecosystem could lead to cascading effects on global climate patterns and further loss of biodiversity across various biomes.

Related terms

Permafrost: A thick subsurface layer of soil that remains frozen throughout the year, found in tundra regions and significantly impacting vegetation and drainage.

Biodiversity:

The variety of plant and animal life within a specific habitat or ecosystem, which can be limited in the tundra due to harsh climatic conditions.

Taiga: A biome characterized by coniferous forests that is typically found just south of the tundra, featuring a different climate and biodiversity.