section23_ak - MIT Department of Biology 7.014 Introductory...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2005 Recitation Section 23 Answer Key May 9-10, 2005 Communities a) i) Explain the theory behind this assumption. If the moose eat more of the leaves, the tree will not be able to produce as much biomass since the leaves account for the bulk of the primary productivity of a tree (photosynthesis happens there). With less productivity, the tree makes less wood, so the rings will be smaller. ii) What is another possible relationship between moose and fir trees? The amount of moose growth reflects the amount of fir trees available for food. b) Most of the paper deals with a predator-prey oscillation in this system. For example, the moose and wolves appear to be in a classic predator-prey oscillation. That is, the populations of both organisms rise and fall regularly. i) Explain what causes the oscillation in the moose/wolf system and why the two population graphs show opposite oscillations. When moose are high, the wolves eat well and reproduce more. As this happens, the wolf
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This note was uploaded on 05/02/2009 for the course BIOL 7.014 taught by Professor Walker during the Spring '05 term at MIT.

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