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Lecture

succession.docx

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Department
Biology
Course Code
BIOLOGY 2F03
Professor
Kim Dej

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Description
November 12 , 2012 Biology 2F03: Fundamental and Applied Ecology Succession Succession - community changes include increases in species diversity and changes in species composition - ecosystem changes include increases in biomass, primary production, respiration, and nutrient retention - mechanisms of succession include facilitation tolerance, and inhibition - community stability may be due to lack of disturbance or community resistance Definitions - succession: gradual accumulation and change in plant and animal communities in an open area - primary: succession on newly exposed geological substrates - secondary: succession following disturbance that does not destroy all life - climax community: late successional community – remains stable until disrupted by disturbance Glacier Bay primary succession - Reiners et al. studied changes in plant diversity during succession - total number of plant species increased with plot age - species richness increased rapidly in early years of succession and more slowly during later stages - not all groups of plants increased in density throughout succession Glacier Bay example - the number of plant species in
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