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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 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, as with primary succession, tends to result in the transition of a community from the original pioneer 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.