Share Science Unit 1.5-1.8
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An event that changes an ecosystem for a long period of time.
Disturbance
Slow changes that take place in an ecosystem after a disturbance.
Succession
Three natural changes to an ecosystem are:
Hurricane, Floods Drought (also fire, landslides, tsunami)
Two ways humans change ecosystems are:
1. Deforestation (cutting down trees) 2. Building Dams
Why do animals migrate?
To meet their needs.
Why do animals hibernate?
Because they cannot find food in the colder weather.
If animals cannot adapt to their changing ecosystem, what may happen to them?
They may not survive.
An animal that captures and eats other animals
Predator
An animal that is captured and eaten
Prey
What kind of ecosystem allows many species of organisms to meet their needs?
A healthy ecosystem
In order for an ecosystem to be healthy, what must exist between predators and prey?
Balance
If there are not enough prey, what happens to the predators?
They may starve
If the number of predators is decreased, what happens to the population of prey animals?
The number of prey can increase too much
Why is the base of the energy pyramid larger than the top?
Energy is lost as heat at each level, so less energy is available at the top.
What do all food chains have in common?
They all begin with a producer.
How are food webs related to food chains?
Food webs are overlapping food chains.
