Week 13, Lecture 3, Ecosystems

Week 13, Lecture 3, Ecosystems - Ecosystems Succession...

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Lajoie –Ecosystems ‘09 Ecosystems Lajoie –Ecosystems ‘09 Succession - sequence of changes in a community after a disturbance (fire, flood, glacier, volcano, biotic) - predictable transition to stable climax community Primary succession - new area needs soil built - mosses, lichens, grasses, shrubs, trees - takes about 200 years Secondary succession - existing community cleared - soil intact - grasses, shrubs, trees - takes about 50 years Lajoie –Ecosystems ‘09 Succession Early stages - r-strategists are good colonizers - high fecundity, good dispersal - "weedy" types provide ground cover - 1st colonizers affect later arrivals - inhibition and facilitation Later stages - soil built by early colonizers - supports shrubs (shade, moisture) - allows colonization by conifers - allows colonization by hardwoods - climax community (environment) - K-strategists in stable habitat Lajoie –Ecosystems ‘09 Climax communities Why does succession stop at certain stages? Fig 46.27
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Week 13, Lecture 3, Ecosystems - Ecosystems Succession...

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