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How Species InteractAltering the Standard View on Trophic Ecology$
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Roger Arditi and Lev Ginzburg

Print publication date: 2012

Print ISBN-13: 9780199913831

Published to Oxford Scholarship Online: May 2015

DOI: 10.1093/acprof:osobl/9780199913831.001.0001

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Alternative Theories of Trophic Interaction

Alternative Theories of Trophic Interaction

(p.8) Chapter 1 Alternative Theories of Trophic Interaction
How Species Interact

Roger Arditi

Lev R. Ginzburg

Oxford University Press

This chapter discusses the alternative ways to interpret elemental trophic interactions mathematically. It outlines the prey-dependent models, predator-dependent models, and ratio-dependent models used in the entire text. It focuses first on the Monod and Contois equation of growth and compares both approaches in describing the growth rate of bacteria as a function of sugar concentration. It then considers the Arditi-Ginzburg ratio dependent functional response which argues that the predation, reproduction, and mortality are truly continuous processes and are operating on the same timescale in a perfectly mixed environment. The chapter also proposes the gradual interference model, and highlights that the conversion of prey biomass is one requirement that predator-prey models must obey.

Keywords:   elemental trophic interactions, prey-dependent models, predator-dependent models, ratio-dependent models, equation of growth, Arditi-Ginzburg ratio, predation, gradual interference

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