Unit 2 Part 3 ( Succession)

Glaciers melt and leave exposed rock

Plants die from drought and decompose

Land is bulldozed and soil remains

ecological recession

climax recession

ecological succession

climax succession

Biodiversity refers to the difference in ages of organisms, so some organisms arrive earlier than others.

Over time, the same trees begin to reproduce and take over an area.

Many populations of organisms gradually begin to occupy the same area to create a climax community.

Many organisms move in to the area for a short amount of time, then leave to find a better habitat.

trees to grow in an area that has been disturbed

trees that replace the original trees after a forest fire

organisms to live in previously uninhabited areas

organisms to live in a forest canopy

peak community

turf community

climax community

disturbed community

Primary Succession

Secondary Succession

Both Take The Same Amount of Time

Mature Tree Growth

Climax Community

Pioneer Community

I only

II only

I and II

I and III

I, II and III

Keystone species can be mutualists with other species.

Keystone species are often rare individuals in a community.

Keystone species are most likely to be commensalists.

Keystone species can be highly lethal to several species in a community.

Keystone species may interact with only a single other species

Dead biomass is retained in the forest.

Nutrients in dead material are liberated for primary producers.

The risk of larger forest fires is minimized.

Habitat is provided for early-succession species.

The burning of the forest can stimulate the growth of other plant species.

Source

Sink

Service

Spiritual

Regulating

Provisioning

Cultural

Supporting

Supporting

Regulating

Cultural

Provisioning