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Unformatted text preview: - becomes more favorable to plants productivity- incr photosynthesis, biomass, lifespan selection - from r-selected to K regulation - from external to internal resilience - recovery from disturbance- from high to low BIO 20 SUCCESS 2 plant diversity- greatest at intermediate stages animal diversity - greatest at pioneer 4. FIRE sources - lightning or human activity- natural role in ecosystem benefits - fertilizes soil, sanitizes pests- increases repro (germinate seeds)- increases diversity (open understory)- regenerates forest (burn old)- maintains subclimax (burn climax) suppression - uncontrollable & hot succession - without fire- grasslands would be replaced by shrubs (also wet winter, dry hot summer)- chaparral would be replaced by forest- Sequoias would be replaced by other trees...
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- Spring '08