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James Su 2019-04-26 22:10:58 +00:00
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Grade 9/Science/SNC1DZ/Study_Sheet.md
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@ -524,6 +524,26 @@ atmosphere, river to lake)
- Not all disturbances can be repaired. - Not all disturbances can be repaired.
- Disturbances can be repaired through humans actions that support the natural processes of succession. - Disturbances can be repaired through humans actions that support the natural processes of succession.
## ECOLOGICAL BALANCE
- `Population`: A group of organisms of one species that interbreed and live in the same place and time.
- Population often change due to both **natural and artifical** factors (human activity).
- `Carry Capcity`: The maximum population size of a **particular species** that a given ecosystem can sustain.
## Changes In Population
- The carry capcacity of an ecosystem depends on numerous biotic and abiotic factors.
- These can be classified into two categories.
1. `Density dependent factors`
2. `Density independent factors`
## Density Independent Factors
- DIF’s can affect a population no matter what its density is. The effect of the factor (such as weather) on the size of the population **does not** depend on the **original size** of the population.
- Examples:
- unusual weather
- natural disasters
- seasonal cycles
- certain human activities—such as damming rivers and clear-cutting forests
## Biodiversity ## Biodiversity
- The variety - The variety