April 1-post - Lecture 35: April 2 Discussion Activity...

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1 Lecture 35: April 2 Contemporary Communities: Structure & Patterns • Nature of communities? - four hypotheses • Community assembly - a case study in ponds • Disturbances & effects on community composition and structure - Yellowstone -G lac ierBay productivity, stability, resiliency Discussion Activity this week Article on carbon footprint , EPA website and carbon calculator (week 13 folder) Check Qwizdom Points on SAMS https://cats.lsa.umich.edu/ Chapters 54 : 1229-1240; 55 : 1270-1272 nature of communities ? Are communities highly structured and organized or loose assemblages of species? The nature of communities – early views (plant ecologists) Fred Clements interactive hypothesis communities are stable, highly ordered and have a predictable species composition pass through predictable series of stages climax community is stable species interactions Henry Gleason individualistic hypothesis communities are loose assemblages of species neither stable nor predictable community composition is a function of chance, (abiotic factors) early 1930s The nature of communities – later views (animal ecologists) rivet hypothesis 1981 species are like rivets in a plane’s wing removing one rivet has little effect on plane removing many rivets can lead to disaster Brian Walker redundancy hypothesis 1992 communities are loose assemblages of species species in a community are ‘redundant’ community composition
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2 Which view is closer to reality? Studies of changes in
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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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April 1-post - Lecture 35: April 2 Discussion Activity...

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