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Transcript
Ecological Succession the beginning of the biotic environment Stable Ecosystem • Little or no change takes place • Examples: – Deserts, forests, grasslands. Primary Succession • New life where no life previously exists. Steps of primary succession pg 377 1. Rocks no life 2. Pioneer species – first organisms to live in an area. (usually lichens) soil is made 3. Small simple organisms replace lichens. 4. Soil thickens and more complex organisms begin to grow. 5. Hundreds of years later, tree’s can exist Secondary Succession pg. 378 • Re-growth • Communities need to be in balance. Some are disturbed by natural events and human activities. Steps of secondary succession • An event kills an area of growth. • Small seeds from surrounding life are planted in the newly destroyed area. • Organisms that feed on the new growth begin to move in carrying more complex seeds. • As more complex organisms die, others may take their place.