Presentation on theme: "Succession Ecosystems are NOT static, they are constantly changing"— Presentation transcript:
1 Succession Ecosystems are NOT static, they are constantly changing Natural forces and human activity disturb themEcological succession - series of changes that occur over time in an ecosystemOrganisms occupy a site & change the environment so that other organisms can come inTwo Types:Primary successionSecondary succession
2 Primary SuccessionPrimary succession - happens on surfaces where no soil exists (lifeless ground).Examplesafter a volcanic eruptionafter a glacier melts
3 Primary Succession Steps 1. Pioneer species arrive (lichens): don’t need soil to survive2. Lichens die & decompose organic matter mixes with rock to start making soil3. Mosses & ferns can grow in new soil die & add more nutrients to soil4. Grasses & wildflowers can move in die & add more nutrients to soil5. Shrubs & trees can survive6. End in Climax community
4 Pioneer speciesClimax CommunityFirst set of species to establish themselvesGrow rapidlyShort livedDo well in bright sunlight where nutrients are abundantSeeds are widely and rapidly disbursedlots of hardwoodshade-loving trees
6 Secondary SuccessionSecondary succession – ecosystem is disturbed but soil is not removed (previous ecosystem remains)Examplescleared farming fieldsforest firesfloodtornadoSoil & seeds still present, so takes shorter amount of timeStart with grasses herbs, shrubs, small trees hardwood trees (climax community)
8 Succession Time Line ***Be sure to label each picture Primary SuccessionSecondary SuccessionStart with a picture that represents a natural occurrence that would wipe out top soil. Ex: fire, mudslide, deforestationStart with weedsShrubs/ bushespinemature hardwoodsStart with a picture that represents a natural occurrence that would wipe out top soil. EX: erosion, glacier movement, volcanic eruption.Rocks or Earth’s crust with no top soil.Pioneer SpeciesSmall shrubs/bushesPinesMature hard woods***Be sure to label each picture
9 When finished, write 2 paragraphs on your construction paper to describe the following: Paragraph # 1: Primary SuccessionExplain the steps of succession.What traumatic events would cause this re-growth to occur?What are pioneering plants? What are some examples of these?Explain why this type of succession takes longer than secondary.Paragraph #2: Secondary SuccessionExplain the steps of secondary succession.Why would pioneer plants not be needed?What do secondary successions have that primary successions do not?