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EOCT Review Succession Guided Notes- ANSWER KEY Predictable CHANGES of GROWTH that occur in a community over time in order to reach stability. PIONEER SPECIES ROCK INTERMEDIATE CLIMAX LICHEN PIONEER SPECIES NATURAL DISASTER INTERMEDIATE CLIMAX Primary Succession • • • BREAKDOWN of rock must occur in order to FORM SOIL. Occurs on BARREN OR NEWLY formed land Takes a LONGER TIME to reach a climax community Secondary Succession • Soil is ALREADY present • Occurs AFTER a NATURAL DISASTER or CLEARING AWAY of already present land Takes a SHORTER TIME to establish a climax community • 1- B- volcanic rock-lichen-mosses-sea grasses In primary succession, an ecosystem must be created from scratch. The lichens and mosses in this example, erode the rock and create soil that the seagrasses can later grow in. Shrubs and coconut trees would not appear until much later. 2- D- During ecological succession an increasing number of resources and niches become available for animals. More and more plants move in, creating more homes and more food for animals to follow. 3- C- Primary succession follows an event like a lava flow, an event that kills off all life forms in an area 4- C- Climax communities are usually more rich in species biodiversity than communities that are undergoing primary succession. Climax communities are a mature ecosystem. Generally, they have had time to accumulate many species that could not live during the early stages of the ecosystem, along with some species that remain from earlier stages.