BIOL2060 - Lecture 31 - Nov 27, 2013

Food chains and top down vs bottom up control how do

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Unformatted text preview: chains and top-down vs. bottom-up control How do we quantify the strength of trophic interactions?— Mouse removal indicates very strong (relationship) / (trophic interaction) T T Mouse removal increases gypsy moth populations From: Jones, C. G., R. S. Ostfeld, M. P. Richard, E. M. Schauber, and J. O. Wolff. 1998. Science 279: 1023-1026 Food chains and top-down vs. bottom-up control How do we quantify the strength of trophic interactions?— Acorn addition Acorn addition attracts mice & deer, which increases tick populations From: Jones, C. G., R. S. Ostfeld, M. P. Richard, E. M. Schauber, and J. O. Wolff. 1998. Science 279: 1023-1026 similar amount of ticks on a mouse (in both populations) - so ticks use mouse to propagate themselves 4 bottom-up control = prey/producer importance -due to acorn addition experiment affecting tick population greatly top-down control = predator/consumer importance -due to mouse removal experiment affecting food web Food chains and top-down vs. bo...
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This document was uploaded on 03/10/2014 for the course BIOL 2060 at University of Guelph.

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