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7-2 How Does Climate Affect the Nature and Locations of Biomes?

Learn how variations in temperature and precipitation influence the formation and distribution of biomes around the world, shaping the unique flora and fauna of different ecosystems. Explore the characteristics and adaptations of tropical rainforests, temperate forests, grasslands, and more, as well as the key factors affecting soil quality and biodiversity. Discover the crucial role of climate in determining where organisms can thrive in various biomes.

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7-2 How Does Climate Affect the Nature and Locations of Biomes?

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  1. 7-2 How Does Climate Affect the Nature and Locations of Biomes? • Concept 7-2 Differences in average annual precipitation and temperature lead to the formation of tropical, temperate, and cold deserts, grasslands, and forests, and largely determine their locations.

  2. Climate Affects Where Organisms Can Live • Biomes characterized by having similar: • Climate • Precipitation • Temperature • Soil • Plants • Animal • Latitude and elevation • Biomes are mosaics of patches • Do not have distinct boundaries (ecotone)

  3. The Earth’s Major Biomes

  4. Generalized Effects of Elevation and Latitude on Climate and Biomes

  5. Natural Capital: Average Precipitation and Average Temperature as Limiting Factors

  6. Biome: Deciduous Forest • Climate • Temperature: Temperate & Tropical • Precipitation: 75 – 250 cm per year • Dominant Vegetation & Adaptations: • Hardwood (Deciduous) Trees • Loose leaves in winter to conserve energy

  7. Biome: Deciduous Forest • Major Locations • North America, Europe, Australia, and Eastern Asia • Characteristic Fauna • Black bear, white-tail deer, squirrels, raccoons, opossums

  8. Biome: Deciduous Forest • Soil Characteristics • Very rich soil with high organic content • Other Important Facts • Slow decomposition rates in the forest lead to high soil quality

  9. Temperate Rain Forest in Washington State, U.S.

  10. Climate Graphs of Tropical, Temperate, and Cold Forests

  11. Biome: Tropical Rainforest • Climate • Temperature: Tropical • Precipitation: 200 – 400 cm per year • Dominant Vegetation & Adaptations: • Broadleaf Evergreen trees • Large leaves to catch rare sunlight • Vines, epiphytes • Get moisture from the air, roots not in ground • All plants adapted to LOW light

  12. Biome: Tropical Rainforest • Major Locations • South America, West Africa, Southeast Asia • Characteristic Fauna • Monkeys, insects, amphibians, tropical birds

  13. Biome: Tropical Rainforest • Soil Characteristics • POOR soil due to rapid rate of decomposition • Other Important Facts • Stratification provides niches for specialized species – leads to high biodiversity

  14. Stratification of Specialized Plant and Animal Niches in a Tropical Rain Forest

  15. Biome: Grasslands • Climate • Temperature: Tropical & Temperate • Precipitation: 10 – 60 cm per year • Dominant Vegetation & Adaptations: • Sod-forming grasses which are adapted to fire • Grasses store most of their biomass in the roots, this ensures their recovery after a fire, and after grazers have eaten their tops

  16. Biome: Grasslands • Major Locations • North American plains (prairies), Russia (steppes), South Africa (velds), Argentina (pampas), Africa (savanna) • Characteristic Fauna • Grazers & Browsers

  17. Biome: Grasslands • Soil Characteristics • Rich Soil • Has made the grasslands prime for human interference by agriculture • Other Important Facts • Fire adapted • Large animals

  18. Climate Graphs of Tropical, Temperate, and Cold Grasslands

  19. Monoculture Crop Replacing Biologically Diverse Temperate Grassland

  20. Biome: Taiga (Boreal or Coniferous Forest) • Climate • Temperature: Cold • Precipitation: 20- 60 cm (mostly in summer) • Dominant Vegetation & Adaptations: • Coniferous evergreens • Small needle-shaped leaves with waxy coating to help conserve energy loss. Stay green all year because of relatively low solar intensity year-round

  21. Biome: Taiga (Boreal or Coniferous Forest) • Major Locations • Northern North America (Canada), Northern Eurasia • Characteristic Fauna • Bears, wolves, moose, lynx, and burrowing rodents

  22. Biome: Taiga (Boreal or Coniferous Forest) • Soil Characteristics • Soil is thin and nutrient poor because of the acidic tannins in pine needles • Other Important Facts • California’s Giant Redwoods (Sequoias)

  23. Biome: Tundra • Climate • Temperature: Cold (grassland) • Precipitation: Less than 25 cm • Dominant Vegetation & Adaptations: • Herbaceous plants • Low-growing plants,dwarf shrubs,lichens

  24. Biome: Tundra • Major Locations • Northern latitudes of North America, Europe and northern Eurasia • Characteristic Fauna • Caribou (reindeer), migratory waterfowl, arctic wolf, arctic fox, musk oxen, snowy owl

  25. Biome: Tundra • Soil Characteristics • Permafrost!! • Very thin, fragile soil • Other Important Facts • Most annual growth occurs in the 7-8 week long summer • Melting permafrost releases CH4 and CO2: both greenhouse gasses!!

  26. Biome: Chaparral (Scrub/Shrub Forest) • Climate • Temperature: Temperate • Precipitation: 50 – 75 cm (mostly in winter) • Dominant Vegetation & Adaptations: • Small trees with large hard leaves, spiny shrubs, adapted to fire • Burn easily • Seeds germinate when exposed to hot fire

  27. Biome: Chaparral (Scrub/Shrub Forest) • Major Locations • Western North America, the Mediterranean • Characteristic Fauna • Mule deer, chipmunks, jackrabbits, lizards, variety of birds

  28. Biome: Chaparral (Scrub/Shrub Forest) • Soil Characteristics • Shallow and infertile soil • Other Important Facts • Prone to fire in dry season • Desirable climate w/ risks!

  29. Chaparral Vegetation in Utah, U.S.

  30. Biome: Deserts (Hot & Cold) • Climate • Temperature: Tropical, Temperate, Cold • Precipitation: Less than 25 cm • Dominant Vegetation & Adaptations: • Cactus and other low-water adapted plants (Succulents)

  31. Biome: Deserts (Hot & Cold) • Major Locations • 30 North and South of the Equator • Characteristic Fauna • Camels, reptiles, rodents (kangaroo rat – never drinks water)

  32. Biome: Deserts (Hot & Cold) • Soil Characteristics • Coarse texture (sandy) • not good at holding moisture or nutrients • Other Important Facts • Fragile ecosystem due to • Slow plant growth • Low species diversity • Slow nutrient recycling • Lack of water

  33. Climate Graphs of Three Types of Deserts

  34. La Mesa, CA

  35. Philadelphia

  36. Biome review! • What are some of the traits that are similar between biomes of the same type? • What is an ecotone? • Which type of grassland is found in Africa? • Which type of desert is found in Mongolia? • Why is Antarctica not considered a part of a biome? • Which biome do we live in? • What is stratification? Where do we see it? • If I hiked up a mountain, tell me what changes in vegetation I would experience. • Why do pine trees have needle shaped leaves? • Why do rainforest trees have broad-leaves? • Why do deciduous trees lose their leaves? • Explain how grasses are adapted to their environment.

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