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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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How Gradual Interference and Ratio Dependence Emerge

How Gradual Interference and Ratio Dependence Emerge

(p.83) Chapter 4 How Gradual Interference and Ratio Dependence Emerge
How Species Interact

Roger Arditi

Lev R. Ginzburg

Oxford University Press

This chapter focuses on mechanistic theoretical approaches to explain the emergence of ratio dependence at a global scale from various behavioral models of species interaction. It explains how refuges and spatial heterogeneity as well as forms of temporal and biological heterogeneities can lead to a ratio-dependent functional response. It provides a two-patch model that shows by what method donor control can emerge from being a prey refuge and being subject to intense predation. It also discusses how ratio dependence emerges in realistic models of predator-prey interactions where spatial distribution of both the predator and prey is explicitly followed. It highlights application of these models to the explanation of successful biological control of insect pests.

Keywords:   ratio dependence, refuges, spatial heterogeneity, biological heterogeneities, prey refuge, predation, biological control

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