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Published byAnnabel Limbert Modified over 9 years ago
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CHAPTER 53 COMMUNITY ECOLOGY Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Section C2: Disturbance and Community Structure (continued) 3.Ecological succession is the sequence of community changes after a disturbance
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Ecological succession is the transition in species composition over ecological time. Primary succession begins in a lifeless area where soil has not yet formed. 3. Ecological succession is the sequence of community changes after a disturbance Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings
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Fig. 53.19 Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings
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Mosses and lichens colonize first and cause the development of soil. An example would be after a glacier has retreated. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings
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Secondary succession occurs where an existing community has been cleared by some event, but the soil is left intact. Grasses grow first, then trees and other organisms. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings
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Soil concentrations of nutrients show changes over time. Fig. 53.20 Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings
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