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Food Webs (MPB-50)$
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Kevin S. McCann

Print publication date: 2011

Print ISBN-13: 9780691134178

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691134178.001.0001

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(p.123) Chapter Eight More Modules
Food Webs (MPB-50)

Kevin S. McCann

Princeton University Press

This chapter considers four-species modules and the role of generalism (effectively a three-species module with a consumer feeding on two resources). It first examines how generalists affect the dynamics of food webs by focusing on a set of modules that contrast generalist consumer dynamics relative to the specialist case. It then discusses organismal trade-offs that play a role in governing the diamond food web module and the intraguild predation module, arguing that such tradeoffs influence the flux of matter, the organization of interaction strengths, and ultimately the stability of communities. The chapter also reviews empirical evidence showing that apparent competition and the diamond module with and without intraguild predation are ubiquitous, and that weak interactions in simple modules seem to promote less variable population dynamics.

Keywords:   module, generalism, generalists, food webs, trade-offs, diamond food web, intraguild predation model, interaction strength, competition, population dynamics

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