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Ecological Succession The natural process by which one community of organisms slowly replaces another in a certain area Two Types of Succession 1.Primary Succession Facts: Process that occurs where no ecosystem existed Starts after a disturbance where no soil exists begins on bare rock with Pioneer Species : EX: Mosses and Lichens Pioneer species the first species to populate an area where Primary succession is taking place Two Types of Succession 2. Secondary Succession: series of changes that occur after a disturbance in an existing ecosystem – starts after a disturbance where soil exists – Ex: Fire devastates a forest – Area of Rainforest cut down by loggers Succession; Begins as bare rock and pioneer species; moss and lichen. Over time soil is produced allowing for the growth of grasses…making the soil richer which allows for the growth of shrubs. When the grasses die and shrubs loose their leaves this produces waste which creates an even richer amount of soil allowing for the growth of maples and oak trees. Eventually the once bare area become dense with tall trees that it leaves little area for more plants to grow. This is called a Climax Community CLIMAX COMMUNITY • • • • Final Stage of succession Usually 1 dominant species Community is at equilibrium Remains stable unless a natural disaster or major human impact event occurs Mt. St. Helen Before Eruption What stage of succession do you think will now occur, if any? What appears to be growing on the bare rock? Describe what has happened. Secondary Succession