The following will be covered in the lesson: Predict how an ecosystem will change as a result of major changes in an abiotic and/or biotic factor.

The following will be covered in the lesson:

Predict how an ecosystem will change as a result of major changes in an

abiotic and/or biotic factor.

SUCCESSIONSUCCESSIONSeries of predictable changes

that occur in a community over time.

Over time aquatic ecosystems fill in with sediment and dead plant material creating a land

ecosystem.

Over time aquatic ecosystems fill in with sediment and dead plant material creating a land

ecosystem.

A colony of beavers dam a stream, creating

an open pond in the forest, and the

surrounding trees die.

A colony of beavers dam a stream, creating

an open pond in the forest, and the

surrounding trees die.

Plants that like damp conditions thrive

around the margins of pond.

Plants that like damp conditions thrive

around the margins of pond.

As these plants complete their life cycle and die, they

add to the accumulating organic matter which is

making the pond shallower.

As these plants complete their life cycle and die, they

add to the accumulating organic matter which is

making the pond shallower.

pond begins to dry out and pond-edge plants

(cattails and sedges) take over inside of dried pond.

pond begins to dry out and pond-edge plants

(cattails and sedges) take over inside of dried pond.

Around the ponds edges the plants are being replaced by shrubs.

Around the ponds edges the plants are being replaced by shrubs.

Finally, the shrubs are replaced by

trees...

Finally, the shrubs are replaced by

trees...

PRIMARY PRIMARY SUCCESSIONSUCCESSIONRegular pattern of

species replacement where nothing has lived

before.

PIONEER SPECIESPIONEER SPECIES•The first species to populate an area where succession is starting.

•Able to live in harsh conditions.

•Can grow in poor soil.

VOLCANO

When the volcano finishes erupting pioneer species will slowly begin taking root on the newly created mountain.

This would be primary succession since nothing has grown there before.

When the volcano finishes erupting pioneer species will slowly begin taking root on the newly created mountain.

This would be primary succession since nothing has grown there before.

SECONDARY SECONDARY SUCCESSIONSUCCESSION

•Series of changes in an area where the ecosystem has been disturbed, but where soil & organisms still exist.

•Occurs after disturbances such as fires and floods.

Clear Creek Fire, Salmon-Challis N.F./

2000

Clear Creek Fire, Salmon-Challis N.F./

2000

This forest in Yellowstone is going through secondary succession after wildfires burned

thousands of acres.

This forest in Yellowstone is going through secondary succession after wildfires burned

thousands of acres.