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Changes in Ecosystems: Ecological Succession

Changes in Ecosystems: Ecological Succession. 9/9/19 Warm-Up: What could lead to increased or decreased diversity in an ecosystem? What happens when an ecosystem is disrupted?. What is Ecological Succession?. Natural, gradual changes in the types of species that live in an area

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Changes in Ecosystems: Ecological Succession

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  1. Changes in Ecosystems:Ecological Succession 9/9/19 Warm-Up: • What could lead to increased or decreased diversity in an ecosystem? • What happens when an ecosystem is disrupted?

  2. What is Ecological Succession? 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

  3. Primary Succession Begins in a place without any soil: Sides of volcanoes Landslides Flooding First, lichens that do not need soil to survive grow on rocks Next, mosses grow to hold newly made soil Known as PIONEER SPECIES

  4. Pioneer Species Low, growing moss plants trap moisture and prevent soil erosion Lichens break down rock to form soil.

  5. 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

  6. Primary Succession Simple plants like mosses and ferns can grow in the new soil

  7. Primary Succession The simple plants die, adding more organic material (nutrients to the soil) The soil layer thickens, and grasses, wildflowers, and other plants begin to take over

  8. Primary Succession These plants die, and they add more nutrients to the soil Shrubs and trees can survive now

  9. Primary Succession Insects, small birds, and mammals have begun to move into the area What was once bare rock, now supports a variety of life

  10. 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 https://drive.google.com/drive/u/0/search?q=Succession

  11. Secondary Succession Disturbances such as fire or flood can disrupt a community. After a disturbance, new species of plants and animals might occupy the habitat. Secondary succession is the orderly and predictable change that takes place after a community of organisms has been removed but the soil remains. Pioneer species begin the process of restoring a habitat after a disruption.

  12. Secondary Succession Occurs faster and has different pioneer species than primary succession Can lead to greater species diversity Example: after forest fires, flood, tsunami

  13. Go to :http://bit.ly/2VpjSht • Start new game. • Play primary succession. READ! • Play secondary succession. READ! • Take the quiz. • Go to your score sheet and enter your information. • Submit score to teacher and follow the directions. My email address is: adwashington@huntsville-isd.org

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