es_100_Lecture_17

es_100_Lecture_17 - Lecture17 Succession Disturbance...

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Lecture 17 Succession Disturbance
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Review of last lecture Finished up mutualisms Defined ‘facilitative interactions’ Finished with model of when facilitation versus competition should be more important Defined Succession Major features of primary succession Species traits of early colonizers Effect of initial colonists on later arriving species (three alternative possibilities)
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Today I. Secondary succession II. Is succession predictable ? Major theories. III. Disturbance regime, definitions IV. Case study, fire in southern California
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I. Secondary succession Initiated by disturbance Can be very rapid. Species colonize from seed bank, or dispersed in from surrounding by wind or animals grow in from edges with vegetative growth Rapidity of succession will depend on many things Size of disturbance, its intensity, types of species in area Environment =not nearly as stressful as in primary succession.
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Traits of early colonists potentially very  different  Primary Stress tolerators May be slow colonizers Likely to show traits of nutrient conservation Maybe somewhat slow growing. Secondary Fast colonization =key Fast growth to grab burst of resources Gap colonizers may be r- selected but later species more K selected
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II.  Is trajectory of succession  predictable? If so, what predicts it?
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Succession is very predictable Facilitation is driving process. Early species ‘lay groundwork’ for later species by alleviating harsh conditions. Pathways converge on similar endpoint that is determined by climate . Species change together in an orderly
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  • Fall '08
  • Staff
  • Ecological succession, secondary succession, large fires, Succession Disturbance, low diversity areas, Succession Major features

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es_100_Lecture_17 - Lecture17 Succession Disturbance...

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