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Evolution Lesson 6
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Endangerment & Extinction
Lack of Genetic Variation
Extinction
While some species evolve into more successful or different species, other species die out.
Extinction is the end of a species.
Species with great genetic diversity are more likely to overcome any sudden/drastic changes to their environment.
It is likely that at least some individuals will have traits that prevent them from becoming susceptible to diseases or that make them more adaptable to extreme changes.
Endangered Species
Species that are at risk of becoming extinct are known as threatened or endangered species.
Species are considered endangered based on:
- the size of the species population
- the rate at which the species is declining
- the likelihood the species will become extinct.
Extreme Natural Events
Notable natural events include intense climate change, asteroid impacts, and large scale volcanic events.
These events caused intense changes to the environment. Most species could not adapt and thus, become extinct.
Why do species become extinct?
Loss of Habitat
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There are 6 major reasons species become threatened, endangered and extinct:
1. Natural Selection
2. Lack of Genetic Variation
3. Extreme Natural Events
4. Loss of Habitat
5. Invasive Species
6. Human Impact
The destruction of a species natural environment.
Natural Selection
A species will become extinct if it cannot
adopt to the environment or if it cannot find a suitable environment to live in and meet its basic needs.
If individuals in the species cannot find a way to adapt to the environment, or if they do not move to a suitable new environment, they die out.
Invasive Species
Species that are introduced to a non-native habitat.
Loss of Habitat
Causes:
- Natural causes (Forest fires, floods, etc.)
- Human activities (deforestation)