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Transcript
Ecological Succession Definition: A series of predictable changes that occur in a community over time Ecosystems change over time ESPECIALLY after disturbances How do they change? Species die out New # species move in of total species increases over time (generally) Primary Succession Occurs on a surface where no ecosystem existed before. Pioneer Species Climax Community What types of disturbances lead to primary succession? Pioneer species: Lichen After a volcanic eruption Following a retreating glacier Secondary Succession Occurs on a surface where an ecosystem has previously existed. Proceeds faster – why?? Climax Community Hayman Fire 5 years and counting Climax Communities Definition: a stable, mature community at the final stage of succession After natural disturbances, original climax community is often reproduced After human-caused disturbances, ecosystems may OR may not return to original climax
