Think About It What happens to an open

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 TAKES A LONG TIME 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 Causes Begins with Type of Pioneer species Length of Time Secondary Succession