BIO 2129 Lecture Notes - Intermediate Disturbance Hypothesis, Trophic Cascade, Keystone Species

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A progression of indirect effects across successively lower trophic levels trophic cascade. Trophic cascades may have effects across multiple and very different ecosystems because individuals of many species move from one habitat type to another. A species that exerts an influence out of proportion to it abundance is called a keystone species; may influence both the species richness of communities and the flow of energy and materials through ecosystems. A plant species that serves as food for many different animals can also be a key stone species. Disturbance is an event that changes the survival rate of one or more species in an ecological community; may remove some species from a community, but may open up space and resources for other species. Keystone species generate disturbance, so do physical events. Succession is a change in a community after a disturbance. Change in composition of an ecological community following a disturbance is called succession.

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