Lecture 9 - Lecture 9: Jan. 25 Community Ecology: Food...

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1 Lecture 9: Jan. 25 Community Ecology: Food Webs, Trophic Cascades & Indirect Effects Food Chains & Food Web - terrestrial vs. marine communities Energy Flow to Deep Sea -mar inesnow - whale carcasses Trophic Cascades & Community Diversity - otters, urchins & whales - wolves, elk & cottonwoods Discussion Activity Next Week ‘Huntington Disease’ article read article before you come to discussion (week 5 folder) Exam 1: Wed. Jan 30 6 to 8 pm; Rooms on CTools Review Session: Sunday Jan. 27, Chem.1800, 3 - 5pm Check Qwizdom Points on SAMS https://cats.lsa.umich.edu/ Reading: Chs. 53 :1229-32; 54 :1248-1252 Biology in the News organisms that obtain energy from same type of source occupy the same “trophic level” or position in the food chain food chains connect the trophic levels in an ecosystem & describe the flow of energy among levels Detritivore What is the distinction between detritivores and decomposers? Food chains are usually embedded in a food web a more complete picture of the trophic relationships among organisms in an ecosystem detritivore food web shown also has links to grazing
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2 All ecosystems exhibit this pattern – the pyramid of productivity (energy) in which the energy is
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This note was uploaded on 12/06/2009 for the course BIO 225 taught by Professor Pavgi during the Spring '08 term at University of Michigan.

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Lecture 9 - Lecture 9: Jan. 25 Community Ecology: Food...

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