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BIOL2060 - Lecture 29 - Nov 22, 2013

7 how do we measure energy flow through an ecosystem

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Unformatted text preview: I? 7. How do we measure energy flow through an ecosystem II? 3 How do communities change over time? •  Ecological succession: changes in species composition of a community over time. •  Primary succession after all organic matter is removed. •  Secondary succession begins after some of the organic matter is removed. ex: farming, forest fires, … 2 How do communities change over time? Example of primary succession: Glacier Bay How do communities change over time? Example of primary succession: Glacier Bay Another example of primary succession: ATOMIC BOMB (ex: Hiroshima, Nagasaki) 20 years after glacial retreat -mosses -Dryas shrubs http://www.nps.gov/glba/naturescience/plant_categories.htm 3 How do communities change over time? Example of primary succession: Glacier Bay 50 years after glacial retreat -Dryas shrubs -Small trees (cottonwood, willow, alder) http://www.nps.gov/glba/naturescience/plant_categories.htm How do communities change over time? Example of primary succession: Glacier Bay 75 years after glacial retreat -Alder thic...
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