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communities proceeding through predictable changes through time |
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Outcome of succession, stable, long-lasting community |
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Primary - begins with total lack of organisms, bare mineral surface, takes longer than secondary |
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Secondary - begins with destruction or disturbance of existing ecosystem |
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Occurs at extreme northern latitudes, or high elevations (mountain tundra) low precipitation (<35cm) Permanently frozen soil layer = permafrost Short plants dominate Waterlogged soils common in summer |
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Very little water (<25 cm/year) High evaporation Large daily temperature fluctuations Species not very dense Species have adaptations to hot, dry environment |
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Desertification: change from fertile land to desert. results from over grazing, intense agricultural use, erosion, water runoff, and over heating of soil. |
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Also called taiga, northern coniferous forest Occurs in southern Canada, northern Europe, much of Russia Short, cool summer; Long harsh winters Spruce and fir, dominant vegetation Humid due to precipitation and low evaporation, but winter dry because precipitation is snow |
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Temperate Deciduous Forest |
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Occur in eastern half of U.S., south central and eastern Canada, southern Africa, Europe, Asia
Moderate rainfall (75-100 cm), relatively evenly distributed Warm summers and relatively mild winters Trees dominant vegetation, type of tree varies geographically |
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Occur in temperate areas Also called prairies or steppes Medium precipitation (25-75 cm) Hot summers, cold to mild winters Grasses dominant vegetation Need fire to prevent invasion of trees, release nutrients Lots of grazing animals Wastes fertilize prairies, grazing helps keep out trees Most grassland has been converted to agriculture |
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Occurs in Africa, South America, Australia High rainfall (50-150 cm), but unevenly distributed Periods of high rainfall, followed by droughts Temperature warm, relatively constant Plants dominated by grasses and drought resistant trees Dominant animals are grazers Plant and animal reproduction timed around rainy season, when resources least limiting |
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Also known as Chaparral. Receives 40-100 cm annual precipitation. Wet, cool winters and hot, dry summers. Typical of Mediterranean coast and coastal southern California. Vegetation dominated by woody shrubs adapted to hot, dry summers. Fire is a common feature. |
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Annual precipitation ranges 50-200 cm. Many exhibit monsoon climate. Rainfall highly seasonal. Drought resistant plants. Occur along equator in Central and South America, Africa, Southeast Asia, Caribbean and Pacific Islands |
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Temperature warm and relatively constant Very high rainfall (>200 cm/year) Rapid growth, but nutrient poor soils Multi-layered forests of emergent trees, canopy trees, understory trees, shade-tolerant plants, and epiphytes Most diverse biome on earth |
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