3.1 How Changes Occur Naturally in Ecosystems

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How can flooding occur?

Heavy rain fall, from melting snow, and tsunami.

What is the result of flooding?

Soil erosion and pollution, If toxic chemicals are present. It can cause disesase among humans due to sewage and bacteria.

Is climate change causing more floods?

Yes in some parts of the world, such as west aferica, where heavier annual rains occuring.

Tsunami

huge, rapidly moving ocean waves.

What causes a tsunami?

large earthquicks or underwater volcanic eruptions.

What causes drought?

Drought usually occurs when there is a below-average amount of precipitation in an area over a period of many months or a year.

What is insect infestation?

When to many insects are born into a community and the community cant sustain all of them. There are too many.

How do insects play a role in natural succession?

They are part of decomposition.

Why is the pine beatle killing lodge pole pines?

The pince beatle has a symbiotic relation ship with the blue stain fungus. The fungus destroyes plant tissue and prevents the tree from using resin to sweep away beatles.

What is natural selection

a natural process resulting in the evolution of organisms best adapted to the environment

What is Adaptive radiation

the development of many different forms from an originally homogeneous group of organisms as they fill different ecological niches

What is Ecological Succession

The series of predictable changes that occurs in a community over time

What is Primary Succession

an ecological succession that begins in a an area where no biotic community previously existed

What is Pioneer Species

first species to populate an area during primary succession

What is Mature Communities

The process of primary succession leads to the development of a mature community.

What is Climax Community

a stable, mature community that undergoes little or no change in species over time

What is Secondary Succession

succession following a disturbance that destroys a community without destroying the soil

What is Flooding

a overflow of water

natural selection

a natural process resulting in the evolution of organisms best adapted to the environment

adaptive radiation

the development of many different forms from an originally homogeneous group of organisms as they fill different ecological niches

Ecological succession

(ecology) the gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established

Primary succession

succession that occurs on surfaces where no soil exists

Pioneer species

first species to populate an area during primary succession

Mature communities

The process of primary succession leads to the development of a mature community.

climax community

a stable, mature community that undergoes little or no change in species over time

Secondary succession

succession on a site where an existing community has been disrupted

Flooding

overfull with water

Tsunami

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

Drought

a temporary shortage of rainfall

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.

Adaptive Radiation

The development of a number of new species from a common ancestor; the new species are adapted to inhabit different niches.

Ecological Succession

Changes that take place over time in types of organisms that live in that area.

Natural Selection

The process in which, over time, the best-adapted members of a species will survive and reproduce. This process makes change in living things possible.

Pioneer Species

Organisms such as lichens and other plants that are the first to survive and reproduce in an area; these organisms change the abiotic and biotic conditions of an area so that other organisms can survive there.

Primary Succession

The development of new life in areas where no organisms or soil previously existed, such as on bare rock; the first organisms may by lichen spores carried by wind.

Secondary Succession

The after reintroduction of life after a disturbance to an area that already has soil and was once the home of living organisms.

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