1. Ecological Succession
Biology
3/23/18
Mrs. Harper

2. March 23, 2018
Begin working on Do Now

3. Do Now 3/23/18 1. Define conservation and sustainable development.
2. What is deforestation?
3. What is overfishing?
4. What is desertification?
5. What is acid rain? What are its effects?
6. What causes global warming?
7. What are the effects of releasing CFCs into the atmosphere?

4. Ecological Succession
Ecosystems change all the time, hurricanes blow in, volcanoes blow up and forests burn. These events can be devastating.
Ecological succession- stages of repopulation after a natural disaster of destruction of some sort to an environment

5. Primary Succession
Primary succession- follows a disturbance that destroys all the living things and soil in an area
Examples
Occurs close to a volcanic eruption where red-hot lava has flowed over the land
Occurs after glaciers recede from an area leaving piles of rocks on barren land

6. Glacier Receding

7. Secondary Succession
Secondary succession- follows a disturbance that has wiped out most living things but has not destroyed the soil
Examples
Hurricanes blowing down strands of trees
Cutting or burning down a forest
Soil is present so new plant life can regrow.

8. Checks For Understanding
What is the main difference between primary and secondary succession?
Would forest fire destruction cause primary or secondary succession?
Would a glacier receding cause primary or secondary succession?

9. Pioneer Species
Pioneer species- first organisms to return to a community after disturbance
Examples: mosses and lichens
These species break down rocks which is the first step in the production of soil

10. Stages of Succession
1. Pioneer species (lichens and mosses) break down rocks
2. Soil develops and seeds sprout to produce grasses, shrubs, wildflowers (animals begin to move in)
3. Trees like aspen begin to grow creating shade which causes grass to die off
4. Other trees like white spruce replace first tree population (this is a climax community)

11. Climax Community
Climax community- stage in which the ecosystem does not change much
In cool areas, climax community is a coniferous forest
In warmer areas, climax community is a deciduous forest
In warm areas, climax community may be a grassland or prairie

12. Stages of Succession
Write a brief description and draw a sketch in the boxes below for each stage

13. Stage 1 Pioneer species break down rocks Write the Above Description
Sketch the image

14. Stage 2 Soil develops/seeds sprout to produce grasses
(early colonizers)

15. Stage 3
Smaller trees (opportunists) grow & shade causes grass to die off

16. Stage 4
Large trees (mature forest) forms climax community

17. EOC PRACTICE Pioneer species come in when there is NO SOIL.
-Which is causing primary succession?

18. EOC PRACTICE
Succession is measured by presence of soil and regrowth

19. EOC PRACTICE
These changes represent the stages of succession.