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Do Now 4/27

Do Now 4/27. OBJECTIVE: Identify and describe the characteristics of major terrestrial and aquatic biomes TASK: Copy definition into notes: A biome is a group of ecosystems in the biosphere with similar abiotic and biotic components. Our Spirit Week Schedule. Wednesday 4/27 – Biomes (R)

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Do Now 4/27

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  1. Do Now 4/27 OBJECTIVE: Identify and describe the characteristics of major terrestrial and aquatic biomes TASK: Copy definition into notes: A biome is a group of ecosystems in the biosphere with similar abiotic and biotic components

  2. Our Spirit Week Schedule • Wednesday 4/27 – Biomes (R) • Thursday 4/28 – Ecology Review (R) • Friday 4/29 – Spirit Fair (BJ) • MONDAY 5/2 – ECOLOGY TEST (BJ)

  3. So how many biomes are there? • No fixed number • 5, 7, 9, or more… depends on how specific you are • We’ll look at 9….

  4. What to do? • Complete your chart as we discuss each biome.

  5. Terrestrial Biomes • Terrestrial biomes are land environments • They are largely defined by patterns of precipitation and temperature.

  6. Tundra • Tundra comes from the Finnish word tunturia, meaning treeless plain. • Extremely cold climate (covered by ice for > 6 months /yr) • Low biotic diversity • Permafrost • Short season of growth and reproduction • Energy and nutrients in the form of dead organic material • Large population oscillations

  7. Taiga • The average temperature is below freezing for six months out of the year • Drier than temperate forest • There are not a lot of species of plants in the taiga because of the harsh conditions. Many coniferous trees. Needle-shaped leaves conserve water • also known as the boreal forest. .

  8. Moderate temperature and rainfall • Diversity of plant and animal species, especially deciduous trees (that lose their leaves in the autumn) • Pronounced seasons • Eastern US & Central Europe

  9. Temperate Grassland • Extremely fertile soil • Dominated by grasses • Semi-arid (10 – 30 inches of rain / year) • “midwest”

  10. Savanna • Hotter & wetter than temperate grassland • warm temperature year round • Dry & Rainy “seasons” • Plants of the savannas are highly specialized to grow in this environment of long periods of drought. • Most of the animals on the savanna have long legs or wings to be able to go on long migrations • Huge areas of savanna are lost to the Sahara desert every year because of overgrazing and farming.

  11. Very Dry! (<10 in. / yr) • Usually hot, but defined by precipitation – Antarctica is a desert too! • Specialized plants adapted to low moisture

  12. Tropical Rain Forest • abundant precipitation ( > 100 in. / year) and year round warmth. • No seasons: each species has evolved its own flowering and fruiting seasons. • Canopy of tree cover • Most biodiverse biome • Many unique, specialized species

  13. Aquatic Biomes • Aquatic biomes are underwater, and there are only two major types: • Freshwater • Marine • Earth is a blue planet: • 70% of surface • Majority of organisms • Majority of photosynthesis • Abiogenesis / evolution

  14. Freshwater Ecosystems • Lakes, streams, rivers, marshes, and estuaries of all types. • Great variety, due to abiotic factors like: • Salt concentration • Light availability • Dissolved O2, CO2, and other nutrients. • Hypotonic environment.

  15. Bull Falls, Shenandoah

  16. Marine Ecosystems

  17. Biome Review • Tundra • Taiga • Temperate Deciduous Forest • Temperate Grassland • Desert • Savanna • Tropical Rain Forest • Others? (Chaparral) • Freshwater / Marine

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