Stage of succession
1. (Colonisation by) pioneer (species);
2. Change in environment/example of change caused byorganisms present;
3. Enables other species to colonise/survive;
4. Change in diversity/biodiversity;
5. Stability increases/less hostile environment;
6. Climax community;
What limits the size of a population?
In a climax community, the following factors can limit the size of a population:
1. named nutrient availability;
2. numbers of producers providing energy (for a food chain);
3. light intensity affecting the rate of photosynthesis; (in plants)
4. disease killing (weaker) members of species;
5. space for nest building / niches;
6. reproductive rate balancing death rate;
7. competition for a named limited resource;
8. (intra and interspecific) competition explained;
9. predation described;
In many ecosystems, succession takes place and can occur in a variety of contexts.
Certain things to look out for when asked to identify whether succession is taking place:
- Colonisation of a hostile environment by pioneer species - usually microscopic organisms or early plants.
- Death etc, leading to change in environment e.g. increase in organic matter etc.
- New species able to come in and colonise leading to an increase in diversity and more niches.
- Increased stability and availiability of nutrients.
- More successful species become dominant.