Ecological Sucession

1
Ecological Sucession

• Defined the gradual long term changes in
  an altered ecosystem

2
In the beginning

• Succession begins when an area is made partially
  or completely devoid of vegetation because of a
  disturbance.
• Common disturbances are fires, wind storms,
  volcanic eruptions, logging, climate change,
  severe flooding, disease, pest infestation, and
  farming
• How devoid of vegetation dictates what type of
  succession will occur

3
Types of Succession

• 1st Primary Succession occurs when both the
  vegetation and topsoil or removed or covered.
• This typically takes longer to replace
• Pioneer species, the first to occupy the
  disturbed area, are often limited to organisms
  that do not need soil, ex. Lichen and moss. They
  help create topsoil by breaking down rock and
  replenishing organic material.
• Examples Strip mining, Volcanic activity, Severe
  wind damage (Hurricane or Tornado) or severe
  flooding (Tsunami)

4
Types of Succesion

• 2nd Secondary Succession occurs when topsoil is
  left intact and/or not all vegetation is
  eliminated
• This can take up to 150 years to finally reach a
  stable ecosystem or what is also known as a
  climax community.
• Pioneer species may include grass or annuals,
  plants that grow and reproduce 1-2 years but then
  die.
• Examples of disturbances fire, farming,
  overgrazing, strong storms (Cat. 1-3 Hurricane),
  logging, disease