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topic 7
Succession
| Question | Answer |
|---|---|
| What is succession | The change in an ecological community over time |
| How does a primary succession begin | This starts with a pioneer species colonising bare rock or sand |
| 2nd stage | Pioneer species like lichen adapt to survive harsh a biotic factors and through their death and decomposition change the abiotic factors to become less harsh and form a thin layer os soil hummus |
| 3rd stage | This then allows Mosses and smaller plants to survive and they increase the depth and nutrient content of soil. This pattern continues this means more larger plants can survive and change the enviroment further |
| 4th stage | New species change the enviroment which leads to it becoming less suitable for the previous species. Therefore each existing species is outcompeted by a new species colonising |
| 5th stage | Changes that organisms produce in their abiotic enviroment can result in a less hostile enviroment and increase biodiversity |
| 6th stage | This leads to the final stage of succession which is climax community and this is dominated by trees |
| What is secondary succession | The succession is disrupted and plants are destroyed Succession starts again but the soil is already created so it does not start from bare rock seral stage |
| What can destruction of habitats lead to | This can lead to result in loss of food and space for organisms and can lead to extinction. To conserve habitats sucecssion is often managed |
| How can a greater variety of habitats be conserved | Maintaining early stages in succession and preventing a climax community |
Created by:
yHya