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4.3 SUCCESSION HOW ECOSYSTEMS RECOVER FROM DISTURBANCES.

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Presentation on theme: "4.3 SUCCESSION HOW ECOSYSTEMS RECOVER FROM DISTURBANCES."— Presentation transcript:

1 4.3 SUCCESSION HOW ECOSYSTEMS RECOVER FROM DISTURBANCES

2 PRIMARY & SECONDARY SUCCESSION 1.What is ecological succession? It is a series of predictable changes that occur in a community over time 2. What is primary succession? Succession that occurs on surfaces where no soil exists (no life) 3. When a disturbance changes a community without removing the soil, what type of succession follows? Secondary succession

3 4. Describe the process of ecological succession Disturbance occurs - > plants begin regrowth, more animals reenter community 5. Why does secondary succession typically proceed faster than primary succesion? Primary takes out the soil whereas secondary still has soil

4 VENN DIAGRAM- COMPARE TWO TYPES OF ECOLOGICAL SUCCESSION PrimaryBothSecondary - Occurs on newly exposed surfaces (Bare rock, no soil) - Takes a longer amount of time Ecosystems grow and become more mature and complex -Occurs when a disturbance does not destroy the soil -Takes less time than primary

5 PICTURE PANELS – FOLLOWING VOLCANIC ERUPTION - Correct order of panels: (from left-right) 1, 3, 4, 2 1: Volcano has erupted and covered area with rocks and ash. No organisms living here 2: pioneer species arrive (lichen) and as they die and decay they weather rock to form soil 3: soil accumulates, allowing grasses to grow 4: more plant species, trees able to grow

6 CLIMAX COMMUNITIES *CHECK FOR KEY CONCEPTS (BOLDED SENTENCES) 8. After a natural disaster occurs in a healthy ecosystem, secondary succession will cause the ecosystem to return to its original ________. Climax community 9. The clearing of a rain forest is the example of a ______________ drastic enough to prevent the original climax community from reforming. Human-caused disturbance

7 10. During _________ succession, chance plays a large role in determining which pioneer species arrives in an area first. Primary 11. What are the two kinds of disturbances that change ecosystems? Give an example of each Natural – volcano, flood, hurricane, tornado Human-caused – clearing rain forest, farmer clearing field, controlled burning

8 MANY ABIOTIC AND BIOTIC FACTORS DETERMINE HOW QUICKLY ECOLOGICAL SUCCESSION CAN CAUSE A CLIMAX COMMUNITY TO DEVELOP IN AN AREA. GIVE TWO FACTORS THAT CONTRIBUTE TO DEVELOPING A CLIMAX COMMUNITY. No major disturbances occurring Development of a climax community -Basic necessities: Sun, water, etc. -More soil forming -Pioneer species -Increasing plant species -More niches available


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