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Succession

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Succession

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    1. Succession Equilibrium in Ecosystems

    2. Changes by Fire Volcanoes create new land on which primary succession occurs

    3. Changes by Fire Forest fires create the opportunity for secondary succession.

    4. ??Questions?? What did the events do to the Earth? How did the events do this? What part of the Earth was affected? What differences were there between the two events other than one was caused by a volcano and the other by a fire?

    5. What is Succession? Succession is the series of predictable changes that occur in a community over time. A community is all the different organisms that live together. A community in an ecosystem is in equilibrium, or a state of balance, when the numbers and species of organisms in it do not change suddenly.

    6. What causes succession? Fires Floods Volcanoes Hurricanes

    7. Types of Succession!! After a disaster, succession helps an ecosystem recover. There are two Main types of ecological succession: Primary succession Secondary succession

    8. Primary Succession Primary Succession- series of changes that occur in an area where no ecosystem previously existed. Example: An area might be a new island formed by the eruption of an undersea volcano Example 2: An area of rock uncovered by a melting sheet of ice. The first species to populate the area are called Pioneer Species. Lichens and mosses carried by the wind or water

    9. Primary succession - occurs on an area of newly exposed rock, sand, or lava or any area that has not been occupied previously by a living (biotic) community

    11. Primary Succession Primary succession may lead to a community of organisms in equilibrium, which does not change drastically unless the ecosystem is disturbed.

    12. Secondary Succession Secondary Succession- the series of changes that occur after a disturbance in an EXISTING ecosystem. Unlike primary succession, secondary succession occurs in a place where an ecosystem has previously existed. Secondary succession restores the ecosystem to a state in which equilibrium can be maintained. occurs somewhat more rapidly than primary succession.

    13. Secondary succession - takes place where a community has been removed, e.g., in a plowed field or a clear-cut forest

    14. Secondary Succession Secondary Succession occurs when a disturbance occurs in an already existing ecosystem. A forest fire burns an ecosystem, then it goes through to secondary succession to restore the ecosystem.

    15. Wrap Up! Succession occurs when a disaster occurs and disturbs the equilibrium of a community. There are two types of succession: Primary Succession occurs where no previous ecosystem exists and establishes equilibrium. Secondary Succession occurs after a disturbance and restores equilibrium in an already existing ecosystem. Vocabulary: Community Equilibrium Succession Primary Succession Pioneer Species Secondary Succession

    16. SCHOOLYARD SUCCESSION Think about how our school campus looks today. Imagine that the school will be closed down permanently at the end of the day. The building will be bulldozed down and all the grass scraped off during removal of debris. Most of the soil remains. Create a timeline of the succession of the area. Assume that the area will remain undisturbed by humans. In your groups, create a timeline to describe the series of changes that restore equilibrium to an ecosystem. Begin with year 0 and labeL it LAND DISTURBANCE. Write a one or two sentence description of what the area looks like. Imagine you can revisit the area and document the changes. Record the year and write a one or two sentence description of what the area looks like each time you visit. BE SURE TO IDENTIFY THE TYPE OF PLANTS THAT ARE GROWING. The revisiting points are 1 YEAR, 15 YEARS, 85 YEARS. Label the timeline with the type of succession that is occurring and the campus name. i.e. THE ______________ SUCCESSION OF _____________ SCHOOL CAMPUS.

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