Think About It What happens to an open field after a major fire has destroyed the area? After a volcanic eruption, and new land is formed will life exist here again?

Ecological Succession Write the information that is in BLUE in your notebook

Ecological Succession How do communities change over time?

Ecological Succesion Definition: predictable changes that occur in a community over time

Causes of Ecological Succession Natural and human disturbances Older organisms move out new move in Wildfires, floods, melting of glaciers

Types of Ecological Succession Primary Succession Secondary Succesion

Primary Succession

Primary Succession First growth of community No soil exists on surface Happens on bare rock after volcanic lava cools and forms rock Happens after glacier melts and exposes rock

Human Disturbance

Secondary Succession

Secondary Succession Second growth of community Happens after a disturbance (wildfire, abandoned cleared land) SOIL remains in community after disturbance

Order of succession 1- Pioneer species: first communities to appear 2- Intermediate species 3- Climax Community- final communities

Organisms of Succession Primary Succession (on rock) Lichensmoss grass small shrubs soft trees hardwood trees Secondary Succession (on soil) Small plants grasses, perrenialsshrubs, soft trees (pine) mature forest (oak, hickory)

Succession is Good? Bad? Succession Good promotes growth in a community, returns nutrients to the soil after disturbance (wildfire) Succession Bad established communities are destroyed, takes a long period of time to build climax community

SUCCESSION TAKES A LONG TIME

Succession in Water

Summary Questions How long does succession take? Two types of ecological succession are… First species to develop in succession are… Primary succession occurs on… Secondary succession occurs on…

Comparison T- chart Create a T- chart that compares the following features of succession Causes Begins with… Type of pioneer species Length of time

T-chart Primary Succession Secondary Succession Causes Begins with Type of Pioneer species Length of Time