changes in ecosystems ecological succession l.
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Changes in Ecosystems: Ecological Succession - PowerPoint PPT Presentation


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Changes in Ecosystems: Ecological Succession. Definition:. Natural, gradual changes in the types of species that live in an area; can be primary or secondary The gradual replacement of one plant community by another through natural processes over time. Primary Succession.

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definition
Definition:
  • Natural, gradual changes in the types of species that live in an area; can be primary or secondary
  • The gradual replacement of one plant community by another through natural processes over time
primary succession
Primary Succession
  • Begins in a place without any soil
    • Sides of volcanoes
    • Landslides
    • Flooding
  • Starts with the arrival of living things such as lichens that do not need soil to survive
  • Called PIONEER SPECIES
slide4

http://botit.botany.wisc.edu

http://www.saguaro-juniper.com/

primary succession5
Primary Succession
  • Soil starts to form as lichens and the forces of weather and erosion help break down rocks into smaller pieces
  • When lichens die, they decompose, adding small amounts of organic matter to the rock to make soil
primary succession7
Primary Succession
  • Simple plants like mosses and ferns can grow in the new soil

http://www.uncw.edu

http://uisstc.georgetown.edu

primary succession8
Primary Succession
  • The simple plants die, adding more organic material
  • The soil layer thickens, and grasses, wildflowers, and other plants begin to take over

http://www.cwrl.utexas.edu

primary succession9
Primary Succession
  • These plants die, and they add more nutrients to the soil
  • Shrubs and trees can survive now

http://www.rowan.edu

primary succession10
Primary Succession
  • Insects, small birds, and mammals have begun to move in
  • What was once bare rock now supports a variety of life

http://p2-raw.greenpeace.org

secondary succession
Secondary Succession
  • Begins in a place that already has soil and was once the home of living organisms
  • Occurs faster and has different pioneer species than primary succession
  • Example: after forest fires
climax community
Climax Community
  • A stable group of plants and animals that is the end result of the successionprocess
  • Does not always mean big trees
    • Grasses in prairies
    • Cacti in deserts