116 ecological succession 115 12/9/2014 starter: ecological succession in a garden on next slide...

116Ecological Succession

115

12/9/2014

Starter:Ecological Succession in a Garden

ON Next Slide

Connection:

Succession Concept Map

Ecological Succession

12/9/2014

Application/Connection/Exit: Notes: Glue here when done

Practice:

What are some factors that affect the environment?

Notes: Glue here when done

Exit:

Explain why secondary succession is important to an ecosystem?

A science class was awarded a grant to start a garden at their middle school. The students chose an open area that was covered with grass. The first step in preparing to plant their garden was to remove the grass and till the soil. Once the area was cleared the students ordered their vegetable seeds. It took two weeks for the seeds to be delivered. After two weeks the students went out to their cleared area to plant their vegetable seeds. What do you think the students found when they visited their area after two weeks? Circle the answer that best matches your thinking.  Nothing has changed. The area looks the same as it did after removing the grass.  The grass has grown back so it must be removed again.  Weeds have taken over the area and are thriving.

Which statement do you agree with?

STARTER

December 9, 2014

AGENDA1 Starter 2.Notes3.Map Objective

TEKS 7.10C observe, record, and describe the role of ecological succession such as in a microhabitat of a

garden with weeds by completing notes and

concept map.

Date Lecture/ Activity/ Lab Page

12/1 Biomes Video 103-10412/2 Biodiversity Lab 105-10612/3 Biodiversity Reading 107-10812/4 Biome Biodiversity Poster 109-11012/5 Biodiversity Writing 111-11212/8 Island Rat 113-11412/9 Ecological Succession 115-116

Ecological Succession Notes

The environment is constantly changing as a

result of weather or the activities

of humans & other organisms.

These changes can naturally happen

slowly over time or quickly as a result of natural disasters or

catastrophic events.

A community of organisms that

occupy an area is also constantly changing and

result in long-term changes in an ecosystem.

All of these changes that occur in an

ecosystem over time result in ecological

succession.

Primary succession

occurs in an area where no

ecosystem existed.

Examples: after a volcanic eruption or bare rock under a

glacier.

The first species to populate an area during primary

succession, called pioneer species…

…are usually mosses or lichens which are able to

grow on bare rock… release acids that begin to break down rock to

create soil.

As colonies of grasses & ferns are established, small animals will move into the area that

feed on the plants.

Larger animals can then move in &

feed on the smaller animals.

More soil is formed that can support larger plants like shrubs which can provide new habitats for more animals.

More soil continues to form & become richer &

deeper so that trees can now be supported

& the community continues to grow.

Given enough time and the right conditions, primary succession may lead to a community in equilibrium that will not change drastically unless the ecosystem is disturbed.

This type of community is known as a climax or mature community.

Secondary succession occurs after a

disturbance in an existing ecosystem

where soil is already established so weeds and grasses can start to grow immediately.

Examples: after forest fires, tornadoes,

hurricanes, floods, etc…

Secondary succession occurs more rapidly

than primary succession to restore the

ecosystem to a state of equilibrium that can be maintained over time.

Stages of primary succession: (forest)

bare rock=> mosses / lichens => grasses &

ferns=> bushes & shrubs=> trees

(young forest) => mature forest (climax

community)

Stages of primary succession

bare rock

grasses & ferns

bushes &

shrubs

trees- young forest

mature forest=>

climax community

mosses &

lichens

Time

Stages of secondary succession: (forest)weeds=> grasses & ferns=> bushes &

shrubs=> trees (young forest) =>

mature forest (climax community)

Stages of secondary succession

weedsgrasses & ferns

bushes &

shrubs

trees- young forest

mature forest=>

climax community

Time

116Ecological Succession

115

12/9/2014

Starter:Ecological Succession in a Garden

ON Next Slide

Connection:

Succession Concept Map

Ecological Succession

12/9/2014

Application/Connection/Exit: Notes: Glue here when done

Practice:

What are some factors that affect the environment?

Notes: Glue here when done

Exit:

Explain why secondary succession is important to an ecosystem?