Transcript
Disturbance and Succession
• Community properties• Dynamics• Succession• Species composition
& Distribution
Community
• What is a community?• Chance assemblage
of species?• Individualistic
hypothesis• Interactive hypothesis• Continuous vs
discrete boundaries
Succession: Primary
• Occurs after major geologic event
• Glacier• New volcanic island• From bare rock, very
little soil
Succession: Secondary
• Existing communities have been cleared• Soil present• Volcanic explosion• Farming• Fire
Species composition & Distribution
• Species richness# of species
• Species abundance# present in each
species• Biodiversity