Changes in the Community

No life in the BLAST zone: no community, no soil.

Primary Succession Development of a community that has not supported life before. Rocks, sand dunes, volcanic islands Formation of soil

Secondary Succession Secondary succession is the rebuilding of an ecosystem after a disturbance that damages or takes out all or part of the existing community, BUT leaves the soil. Floods, tornados, fires

Secondary succession and primary succession tend to result in the transition of a community from the original pioneer species (starter species) to climax community. Climax Community: is a stable group of plants and animals that is the end result of succession. The rate of secondary succession is much faster than primary succession.

Succession in Water

Look familiar?? Which line represents primary succession? Secondary?

Limiting Factors for Population Growth Density Dependent Factors- factors such as predation, competition, availability of food. Depends on how many organisms there are in a certain area. Density Independent Factors- Factors such as natural disasters- do not depend on how many organisms there are in an area.

All biological populations experience exponential growth (see graph below), NOT linear growth.