27. Communities - Succession FALL 2007 skeleton

27. Communities - Succession FALL 2007 skeleton - Final...

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1 Final Exam Dec 11 TUES 12:20- 2:10 PM 2/5 comprehensive; 3/5 since Midterm III
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2 How do communities change with time? If we observe communities over time, a sequence of changes in species composition occurs This change in species composition over time is termed succession Our goal today is to determine: 1. Is the sequence predictable (or random)? 2. What are the causes of the sequence?
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3 Some examples – primary succession (new habitats) Glacial moraine – McBride Glacier, AK
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4 Some examples – primary succession (new habitats) Lichens on bare rock Acadia Nat. Park, Maine
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5 Some examples – primary succession (new habitats) Presque Isle, PA – a peninsula in Lake Erie (60 yrs ago) Beach succession
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6 Some examples – primary succession (new habitats) Presque Isle, PA – a peninsula in Lake Erie (30 yrs ago) Beach succession
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7 Some examples – primary succession (new habitats) Presque Isle, PA – a peninsula in Lake Erie (20 yrs ago) Beach succession
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8 Some examples – primary succession (new habitats) Presque Isle, PA – a peninsula in Lake Erie (today) Beach succession
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9 Some examples – primary succession (new habitats)
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10 Some examples – secondary succession (disturbed habitats)
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27. Communities - Succession FALL 2007 skeleton - Final...

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