Succession
Page 36 of the CGP A2-Level Biology revision guide.
- Created by: Hannah Kent
- Created on: 26-01-14 12:35
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- Succession
- Succession is the process by which an ecosystem changes over time.
- The Biotic conditions change as the Abiotic conditions change.
- Ecosystem= All the organisms living in a particular are and all the non-living conditions.
- There are two types of succession.
- Primary Succession
- This happens on land that's been newly formed or exposed.
- The abiotic conditions are hostile. Only pioneer species can grow because they're specialized to cope with the harsh conditions.
- The pioneer species change the abiotic conditions- they die and microorganisms decompose the Humus. This forms basic soil.
- Humus= Dead organic matter.
- This makes the conditions less hostile, which means new organisms can move in and grow.
- These then die and are decomposed, adding more organic material, making the soil deeper and richer in minerals .
- Larger plants like shrubs can start to grow in the deeper soil, which retains even more water.
- These then die and are decomposed, adding more organic material, making the soil deeper and richer in minerals .
- The pioneer species change the abiotic conditions- they die and microorganisms decompose the Humus. This forms basic soil.
- Secondary Succession
- This happens on land that's been cleared of all the plants, but where the soil remains.
- Primary Succession
- Succession occurs in seral stages.
- At each stage, different plants and animals that are better adapted for the improved conditions move in an out compete the original plants and animals.
- They become the Dominant species in the ecosystem.
- At each stage, different plants and animals that are better adapted for the improved conditions move in an out compete the original plants and animals.
- Succession is the process by which an ecosystem changes over time.
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