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IB 105 Lecture 12
IB 105 Lecture 12
14
Environmental Studies
Undergraduate 2
03/07/2011

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Term
Succession
Definition
communities proceeding through predictable changes through time
Term
climax community
Definition
Outcome of succession, stable, long-lasting community
Term
Primary Succession
Definition
Primary - begins with total lack of organisms, bare mineral surface, takes longer than secondary
Term
Secondary Succession
Definition
Secondary - begins with destruction or disturbance of existing ecosystem
Term
Tundra
Definition
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
Term
Desert
Definition
Very little water (<25 cm/year)
High evaporation
Large daily temperature fluctuations
Species not very dense
Species have adaptations to hot, dry environment
Term
Desertification
Definition
Desertification: change from fertile land to desert.
results from over grazing, intense agricultural use, erosion, water runoff, and over heating of soil.
Term
Boreal Forest
Definition
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
Term
Temperate Deciduous Forest
Definition
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
Term
Grasslands
Definition
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
Term
Savanna
Definition
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
Term
Mediterranean Shrublands
Definition
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.
Term
Tropical Dry Forest
Definition
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
Term
Tropical Rainforest
Definition
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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