Ecological Succession

Review: Food Chains and Webs

Review: What is an ecosystem? Biological community (all different species) and all the non-living factors that affect it REMEMBER: Ecosystems are always changing

Oak Tree Ecosystem

Ecological Succession Definition: change in the ecosystem that happens when one ____________ replaces another as a result of changing __________ and __________ factors Two Types: - community biotic abiotic Primary Succession Secondary Succession

Succession Occurs following a ____________ in the ecosystem disturbance Occurs following a ____________ in the ecosystem Succession is the sequence of ___________ changes that regenerate a damaged community or a community in a previously _____________ area biotic uninhabited

Primary Succession Establishment and development of an ______________ in an area that was previously uninhabited Occurs very _______ First organisms that live in a previously uninhabited area are called ___________ _________ ecosystem slowly pioneer species

Examples Bare rocks- Volcanic eruptions- Rocks erode, sand accumulates, decomposition adds organic matter soil. As soil continues to form plants appear. Following the eruption, there is NO life in the blast zone. Eventually, however, pioneer species do establish themselves.

Primary Succession Process can be started by melting glaciers, volcanic eruptions, landslides

Secondary Succession Reestablishment of a __________ ecosystem in an area where _______ was left intact damaged soil

Examples Fire

Examples Logging

Example Ocean boat scraps bottom

Summary What is ecological succession? What are the two types? Describe the two types.