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  • 116Ecological Succession11512/9/2014Starter:Ecological Succession in a Garden

    ON Next Slide

    Connection:

    Succession Concept Map

    Ecological Succession

    12/9/2014Application/Connection/Exit: Notes: Glue here when done

    Practice:What are some factors that affect the environment?

    Notes: Glue here when doneExit:Explain why secondary succession is important to an ecosystem?

  • A science class was awarded a grant to start a garden at their middle school. The students chose an open area that was covered with grass. The first step in preparing to plant their garden was to remove the grass and till the soil. Once the area was cleared the students ordered their vegetable seeds. It took two weeks for the seeds to be delivered. After two weeks the students went out to their cleared area to plant their vegetable seeds. What do you think the students found when they visited their area after two weeks? Circle the answer that best matches your thinking. Nothing has changed. The area looks the same as it did after removing the grass. The grass has grown back so it must be removed again. Weeds have taken over the area and are thriving.Which statement do you agree with? STARTER

  • December 9, 2014AGENDA

    1 Starter NotesMap Objective TEKS 7.10C observe, record, and describe the role of ecological succession such as in a microhabitat of a garden with weeds by completing notes and concept map.

  • DateLecture/ Activity/ Lab Page12/1 Biomes Video 103-10412/2 Biodiversity Lab 105-10612/3 Biodiversity Reading 107-10812/4 Biome Biodiversity Poster 109-11012/5 Biodiversity Writing 111-11212/8 Island Rat 113-11412/9 Ecological Succession 115-116

  • Ecological Succession Notes

  • The environment is constantly changing as a result of weather or the activities of humans & other organisms.

  • These changes can naturally happen slowly over time or quickly as a result of natural disasters or catastrophic events.

  • A community of organisms that occupy an area is also constantly changing and result in long-term changes in an ecosystem.

  • All of these changes that occur in an ecosystem over time result in ecological succession.

  • Primary succession occurs in an area where no ecosystem existed.

  • Examples: after a volcanic eruption or bare rock under a glacier.

  • The first species to populate an area during primary succession, called pioneer species

  • are usually mosses or lichens which are able to grow on bare rock release acids that begin to break down rock to create soil.

  • As colonies of grasses & ferns are established, small animals will move into the area that feed on the plants.

  • Larger animals can then move in & feed on the smaller animals.

  • More soil is formed that can support larger plants like shrubs which can provide new habitats for more animals.

  • More soil continues to form & become richer & deeper so that trees can now be supported & the community continues to grow.

  • Given enough time and the right conditions, primary succession may lead to a community in equilibrium that will not change drastically unless the ecosystem is disturbed.

  • This type of community is known as a climax or mature community.

  • Secondary succession occurs after a disturbance in an existing ecosystem where soil is already established so weeds and grasses can start to grow immediately.

  • Examples: after forest fires, tornadoes, hurricanes, floods, etc

  • Secondary succession occurs more rapidly than primary succession to restore the ecosystem to a state of equilibrium that can be maintained over time.

  • Stages of primary succession: (forest)bare rock=> mosses / lichens => grasses & ferns=> bushes & shrubs=> trees (young forest) => mature forest (climax community)

  • Stages of primary successionbare rockgrasses & fernsbushes & shrubstrees- young forestmature forest=> climax community mosses & lichensTime

  • Stages of secondary succession: (forest)weeds=> grasses & ferns=> bushes & shrubs=> trees (young forest) => mature forest (climax community)

  • Stages of secondary successionweedsgrasses & ferns bushes & shrubs trees- young forestmature forest=> climax communityTime

  • 116Ecological Succession11512/9/2014Starter:Ecological Succession in a Garden

    ON Next Slide

    Connection:

    Succession Concept Map

    Ecological Succession

    12/9/2014Application/Connection/Exit: Notes: Glue here when done

    Practice:What are some factors that affect the environment?

    Notes: Glue here when doneExit:Explain why secondary succession is important to an ecosystem?