lecture 19

lecture 19 - Lecture 19 - Succession 1 1 Succession and...

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Unformatted text preview: Lecture 19 - Succession 1 1 Succession and Stability Succession and Stability Chapter 20 Chapter 20 Introduction to Succession Introduction to Succession Primary Succession Primary Succession Secondary Succession Secondary Succession Disturbance Disturbance Ecosystem Recovery Ecosystem Recovery Mechanisms of Succession Mechanisms of Succession Community and Ecosystem Stability Community and Ecosystem Stability 2 Chapter 20 - Succession: Definitions Chapter 20 - Succession: Definitions • Succession: Gradual change in plant and Succession: Gradual change in plant and animal communities in an area following animal communities in an area following disturbance. disturbance. Primary succession Primary succession Secondary succession Secondary succession • Climax Community: Late successional Climax Community: Late successional community community 3 Primary Succession at Glacier Bay Primary Succession at Glacier Bay • CONCEPT: CONCEPT: Ecological succession usually involves Ecological succession usually involves increases in species diversity as well as changes in increases in species diversity as well as changes in species composition. species composition. • Reiners Reiners et.al. et.al. studied changes in plant diversity during studied changes in plant diversity during succession at Glacier Bay, Alaska. succession at Glacier Bay, Alaska. • Retreating glacier left newly exposed rock Retreating glacier left newly exposed rock Species richness Species richness Not all groups increased in density throughout Not all groups increased in density throughout succession. succession. 4 Plant Succession at Glacier Bay Plant Succession at Glacier Bay • Max. diversity Max. diversity by 100 years: by 100 years: trees, trees, mosses, mosses, lichens, tall lichens, tall shrubs shrubs Lecture 19 - Succession 2 5 Secondary Succession in Temperate Forests Secondary Succession in Temperate Forests • Essentially all U.S. forests are second growth; Essentially all U.S. forests are second growth; they have been cut down for lumber or they have been cut down for lumber or farmland at least once. farmland at least once. • Succession of temperate U.S. forests is well Succession of temperate U.S. forests is well documented, documented, Grasses succeeded by Grasses succeeded by succeeded by succeeded by succeeded by succeeded by Clearly different from succession in Clearly different from succession in 6 40 years 1 month 15 Years Time Zero...
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This note was uploaded on 11/16/2010 for the course BIO 2227 taught by Professor Sandars during the Spring '10 term at Temple.

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lecture 19 - Lecture 19 - Succession 1 1 Succession and...

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