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Ecological Succession Get out your Journals Ecological Succession the series of changes overtime in an ecosystem. A. Primary successionoccurs where no soil exists Ex. Glaciers After a Vocanic Eruption Pioneer Species -the 1st plants to grow ex. Lichens and Mosses B. Secondary succession – changes happen without removing the soil. It is caused by human actions. Example: wildfires hurricanes floods Wildfires! After the wildfire… When a community of organisms becomes stable , this stage is called climax community.