ch06_Evolution

ch06_Evolution - Ecosystems and Evolution Chapter 6 The...

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Ecosystems and Evolution Chapter 6
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Ecosystem in southern Florida Sawgrass wetlands with small islands of trees Haven for wildlife Half of its original size of 4 million acres Wading birds have dropped 93% since 1930 Home to 50 endangered or threatened species Reason: 50 years of engineering Flood control has reduced water flow to Everglades Created spaces to be used for agriculture/building The Florida Everglades
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The Florida Everglades Federal and State governments are working on Comprehensive Everglades Restoration Plan Restore natural water flow to the area Repel invasions of foreign species Reestablish native species Will never return to natural state
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Earth’s Major Biomes Learning Objectives: 1. Define biome and discuss how biomes are related to climate 2. Briefly describe the nine major terrestrial biomes, giving attention to the climate, soil, and characteristic organisms of each
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Biome: A large, relatively distinct terrestrial region with similar climate, soil, plants, and animals, regardless of where it occurs in the world Encompasses many interacting ecosystems The next level of organization above community, ecosystem, and landscape Earth’s Major Biomes
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Earth’s Major Biomes
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Factors that affect Biomes: Climate Temperature Precipitation Elevation Increasing elevation resembles changes in temperature Latitude temperature most important factor near poles Precipitation more important in tropic and temperate zones Earth’s Major Biomes
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Environmental InSight
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Other important Abiotic factors Rapid temperature changes, fires, floods, droughts, strong winds Important Biotic factors Types of vegetation Land use patterns Earth’s Major Biomes
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Tundra Treeless biome in the far north Consists of boggy plains covered by lichens and mosses (rarely taller than 12 in) Permafrost: permanently frozen ground Harsh, cold winters Extremely short summers Little precipitation, rain or snow, 4–10 inches Low species diversity Easily damaged even by small disturbances Earth’s Major Biomes
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Earth’s Major Biomes
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Boreal Forest/Taiga Coniferous forests, south of tundra Winters extremely cold and severe Little precipitation, 20 in/yr Soil acidic and mineral poor Ponds and lakes dug by glaciars Black and white spruce, balsam fir, other conifers, all evergreen Caribou, wolves, bear, moose Medium to small animals more common Rodents, rabbits, lynx, sable, mink, birds in summer, lots of insects Top source of industrial wood and wood fiber Extensive logging, gas and oil exploration, mining and farming are contributing to forest loss Earth’s Major Biomes
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Earth’s Major Biomes
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Earth’s Major Biomes Temperate Rain Forest Coniferous forest Cool weather High precipitation, dense fog Northwest coast of NA, SE Australia, SA Precipitation more than 50 in/yr
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This note was uploaded on 09/24/2011 for the course ENV 1009 taught by Professor Rodriguez during the Spring '10 term at Broward College.

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ch06_Evolution - Ecosystems and Evolution Chapter 6 The...

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