BIOLOGY 1101 Lecture 22: Communities
30 Nov 2016
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Document Summary
Communities can change or remain stable over time. Succession is the change in species composition in a community over time. Primary succession begins after a disturbance leaves an area barren of soil and with no life. Fungi, bacteria, lichens, seeds often among earliest, colonizers. Secondary succession has a head start, begins when disturbance opens up part of community to development and growth of species previously outcompeted. Disturbance is a fundamental part of most ecosystems and can repeatedly set a community back. Succession is the usually predictable change in the species composition of a community over time. Primary succession begins in an area with no life and no soil. Secondary succession occurs in an area were life is already present. Chemical resources and physical conditions within an area. Biota - refers to the living components of the ecosystem. Soil is living component of ecosystem, not paved over or disturbed severly. Every system has defined parameters; very small to very large.
