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Biome Diversity: Tropical Rainforests, Deserts, Tundra, & More

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  1. The Ecosystem 2.4 Biomes

  2. Assessment Statements • 2.4.1 Define the term biome • 2.4.2 Explain the distribution, structure, and relative productivity of tropical rainforests, deserts, tundra, and any other biome

  3. 2.4.1 Define the term biome • A collection of ecosystems sharing similar climatic conditions.

  4. 2.4.2 Explain the distribution, structure, and relative productivity of tropical rainforests, deserts, tundra, and any other biome • Tropical Rainforest • Temperature: 26 C • Rainfall: Over 2500 mm/yr • Insolation (Light Level): High • Distribution: Between the tropics of cancer and capricorn • Structure: Highly stratified (Emergent, Canopy, Understory, Immature, and Herb layers) • Productivity: High

  5. 2.4.2 Explain the distribution, structure, and relative productivity of tropical rainforests, deserts, tundra, and any other biome • Desert • Temperature: 45 C • Rainfall: Under 250 mm/yr • Insolation (Light Level): High • Distribution: 30 o N and S • Structure: Little vegetation, organisms highly adapted to low water and fluctuating temperatures • Productivity: Very low

  6. 2.4.2 Explain the distribution, structure, and relative productivity of tropical rainforests, deserts, tundra, and any other biome • Tundra • Temperature: Low down to -50 C • Rainfall: Low • Insolation (Light Level): Low • Distribution: High Latitudes • Structure: Plants with leathery leaves or underground storage organs, larger animals with fur • Productivity: Low

  7. 2.4.2 Explain the distribution, structure, and relative productivity of tropical rainforests, deserts, tundra, and any other biome • Temperate forest • Temperature: cold winters, hot summers • Rainfall: 500-1500 mm/yr • Insolation (Light Level): varies through year • Distribution: 40 to 60 o N • Structure: Dominated by one species of tree (evergreen or deciduous) bigger shrub layer due to less dense canopy • Productivity: Relatively high

  8. 2.4.2 Explain the distribution, structure, and relative productivity of tropical rainforests, deserts, tundra, and any other biome • Grasslands • Temperature: cold winters, hot summers, fluctuate wildly if removed from the sea • Rainfall: 250-500 mm/yr • Insolation (Light Level): varies through year • Distribution: Almost every continent 16% of the earth’s surface • Structure: Diverse grasses, with a mat of slowly decomposing vegetation • Productivity: Relatively low

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