APES Video Notes 1.2 - Terrestrial Biomes

Summary

The video discusses terrestrial biomes, focusing on their global distribution, environmental conditions, and the adaptations of plants and animals to their unique climates. Key points include:

• Definition of Biomes: Areas defined by average yearly temperature and precipitation (climate).
• Major Biomes:
  • Tropical Rainforest: High rainfall and warm temperatures.
  • Desert: Very low precipitation, may have high temperatures.
  • Tundra: Cold and low precipitation, characterized by permanently frozen soil (permafrost).
  • Boreal Forest: Dominated by coniferous trees, has low nutrient availability due to slow decomposition.
  • Temperate Forests: High nutrient levels due to broadleaf trees that contribute organic matter.
• Adaptations of Organisms:
  • Desert: Camels store fat in humps; cacti have thick, waxy cuticles to prevent water loss.
  • Tundra: Limited plant growth due to low nutrient levels and frozen soil.
  • Tropical Rainforest: High competition for nutrients leads to nutrient-poor soil despite abundant plant life.
  • Boreal Forest: Low decomposition rates due to cold temperatures result in nutrient-poor soil.
• Biomes and Climate Change: Biomes are shifting due to Climate Change. For example, the Boreal Forest is moving northward as previously frozen soils thaw, allowing tree species to grow in new areas.
• Nutrient Availability: Nutrient levels in soil significantly affect plant and animal communities in different biomes.

Methodology

Identify a biome characteristic. Explain how that characteristic determines the community of organisms found in that biome.

Researchers/Sources Featured

• Mr. Smith (presenter)