3.1 - How Changes Occur Naturally in Ecosystems

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Natural Selection

living organisms change as the abiotic and biotic components in their environment change.

Adaptive Radiation

the change from a common ancestor into a number of different species that "radiate out" to inhabit different niches

Ecological Succession

changes that take place over time int he types of organisms that live in an area.

Primary Succession

occurs in an area where no soil exists

Secondary Succession

occurs as the result of a disturbance to an area that already has soil and was once the home of living organisms

Flooding

an over flow of water. Can result in soil erosion and soil pollution.

Drought

a temporary or prolonged shortage of rainfall. Can result in crop failures and livestock deaths

Tsunami

a huge destructive wave (especially one caused by an earthquake)

Insect Infestation

have a devastating effect on the forest canopy, and bird and mammal habitats.

Pioneer Species

the first organisms to survive and reproduce in and area.

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