Succession in Ecosystems

Mrs. Karim

Succession- a gradual changes in a community over a period of time. new populations of organisms gradually replace existing onesThere are three different stages to succession:

1.Primary succession2.Secondary succession3.Climax Community

Primary succession-Life start forming in rocks, no Soil.

Examples: – Lichens grow bare rock

Primary succession-

New bare rock comes from 2 sources:

1. volcanic lava flow cools and forms rock

Primary succession-

And the other source of rocks2. Glaciers retreat and expose

rock

Pioneer Species-

the first organisms to colonize or grow in anew site

Ex: lichens are the first to Colonize lava rocks

Secondary succession-

sequence of community changes that takes place when a community is disrupted by natural disaster or human actions – takes place on existing soil

Secondary succession-

Ex: A fire levels portions of a forestSoil will be left behind to start secondary succession

Secondary succession-

Ex: A farmer plows his field

Climax community-

a stable, mature community that undergoes little or no succession

Climax community-

Ex: In most of Virginia, the climax community would be a deciduous oak–hickory forest

                                                                                                                                

Vocabularies

Biotic : living things. Give example

Abiotic: non living things. Give examples

Producers: plants …. Why?

Consumers: human, animals,bacteria,… why?

Stages of succesion

Rock

Label the stages of succession

Secondary succession-

Secondary succession-

Explain the stages of ecological succession

Succession video

https://www.youtube.com/watch?v=E0qdWoLdk1c