Outline. Ecology: Major Biomes. Biomes cover wide geographic areas. Biomes: terrestrial ecosystems within specific climatic regions
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1 Ecology: Major Biomes Biomes: terrestrial ecosystems within specific climatic regions Outline 1. Key concepts 2. The sun and its effects on climate 3. Atmospheric circulation and its effects on climate 4. Biomes cover wide geographic areas 5. Aquatic life zones cover the majority of the Earth s surface 6. Conclusions Biomes cover wide geographic areas Biomes classified into nine categories: Tundra Taiga Temperate deciduous forest Grassland Relic conifer forest Chaparral Desert Savannah Tropical rain forest
2 Grassland(prairies, steppes) -1 Also called Temperate Grassland Moderate rainfall: inches per year Characteristics: Large quantities of grasses (few shrubs or trees) Many burrowing rodents Herds of large grazing animals Rich soil/ often converted to agriculture Grassland(prairies, steppes) -2 Hot summer and cold winter Slow succession Why the USA is the number one country for grain production? (rice, corn, wheat ) Relic conifer forest Dominent northern regions myr ago Remain little bit in California (Pacific coast regions of California to Canada) Cone-bearing trees related to sprucefir Sequoia and Metasequoia (found in China early last century - living fossil) Tallest and Biggest trees (440 feet!)
3 Chaparral Mediterranean vegetation Western side of continents, between 30º-40º latitude, with cool wet winter and warm dry summer Dominant plants: drought and fire-adapted shrubs, forbs Fire climax Leaf with wax, hard, thick Well developed underground stems and roots Very rapid succession Chaparral Desert -1 Extremely dry and hot; sparse vegetation; dry air flows over desert regions moisture lost to tropical forests or windward sides of mountains Temperature extremes; 30 degrees C difference from day to night Various adaptations of plants and animals to conserve water and stay cool!
4 Desert -2 Rainfall: 0-10 inches per year uneven one year may plenty and another year no rain at all Dominant plants: many succulents adapted to drought Large number of annual herbs Wettest plants found here Very slow succession Desert Savanna-1 Savanna - Dry forest Monsoon forest Open grasslands (tall grasses); scattered shrubs, trees Equatorial, but the rainfall cannot support forest; grasses can grow Found between tropical forests and deserts Vegetation supports: large herds of herbivores (zebra, gazelles) carnivores (lions, etc.) invertebrates (many insects, including termites)
5 Savanna-2 Two seasons: dry and wet 4-6 months rain and 6-8 months no rainfall Rainfall inches per year Could high as inches highest rainfall per year? highest rainfall per day? Man (Homo sapiens) origin Relatively fast succession Biomes 24 hours (World) Foc-Foc, La Réunion Jan. 7 8, hours (N. Hemisphere) Paishih, Taiwan Sept , hours (Australia) Bellenden Ker, Queensland Jan. 4, hours (U.S.) Alvin, Tex. July 25 26, hours (Canada) Ucluelet Brynnor Mines, British Columbia Oct. 6, days (World) Commerson, La Réunion Jan , month (World) Cherrapunji, India July months (World) Cherrapunji, India Aug Aug ,042 2, months (U.S.) Kukui, Maui, Hawaii Dec Dec
6 Grassland and Savanna Tropical rainforest -1 Regions of high temperature and rainfall near equator Abundant species; plants including vines, epiphytes, orchids, bromeliads, lianas Trees support a diverse community of plants and animals (vines to mammals); greatest biodiversity; largest number of layers Tropical rainforest -2 Buttressed trees, cauliflory and smooth bark common Leaf waxy with an entire margin and a long pointed drip-tip Rainfall 60+ inches per year (normally inches), rains each month, each week, even everyday Succession very rapid
7 forests
8 Aquatic life zones cover the majority of the Earth s s surface Fresh water life zones Estuaries: Life between rivers and oceans Ocean life zones Fresh water life zones Only 2% of Earth s surface Interconnected with terrestrial ecosystems Open: derives organic material from outside Stationary water (lakes): shore, open water, deep water life zones Flowing water (rivers): different ecosystem Higher dissolved oxygen More heterotrophic (fewer producers) Fresh water life zones
9 Estuaries: Life between rivers and oceans Where rivers meet the ocean: mix of fresh and salt water habitats in marshes, deltas, bays Various adaptations of plant and animal life to changing flow rates and salinity Nutrient supply: abundant; derived from terrestrial ecosystems upstream (also easily polluted from these sources!) Ocean life zones -1 Limiting factors to ocean life: Concentration of oxygen (highest at or near surface) Availability of light and food Habitats: Intertidal zone: between the high and low tide water marks harsh environment; changing conditions rocky/sandy shores: abundant life Ocean life zones
10 Ocean life zones -2 Neritic zone: shallow waters along the coasts miles out on continental shelf surface to 200 meters down abundant life in intricate food webs Open-sea zone: beyond continental shelf; depths: 200 m to ocean floor diverse ecosystem with intricate food webs below 200 m: little light; bizarre adaptations
11 In Conclusion The biosphere encompasses the earth s waters, the lower atmosphere, and the uppermost portions of its crust in which organisms live A biome is shaped by regional variations in climate, landforms, and soils Water covers more than 71% of the earth s surface I love my home Savanna!
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