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Population and Community Ecology of Ontogenetic Development$
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André M. de Roos and Lennart Persson

Print publication date: 2013

Print ISBN-13: 9780691137575

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691137575.001.0001

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Ontogenetic Niche Shifts, Predators, and Coexistence among Consumer Species

Ontogenetic Niche Shifts, Predators, and Coexistence among Consumer Species

Chapter:
(p.296) Chapter 8 Ontogenetic Niche Shifts, Predators, and Coexistence among Consumer Species
Source:
Population and Community Ecology of Ontogenetic Development
Author(s):

André M. de Roos

Lennart Persson

Publisher:
Princeton University Press
DOI:10.23943/princeton/9780691137575.003.0008

This chapter considers how stage structure and ontogenetic niche shifts may affect the coexistence between two consumer species competing for two resources in the absence and presence of predators, and how ontogenetic niche shifts may give rise to alternative stable states. More specifically, the analysis will use techniques developed within the consumer-resource framework of Tilman (1982), including consumption and renewal vectors (Schellekens, de Roos, and Persson 2010). Tilman showed that stable coexistence between consumers feeding on the same two resources is possible if each consumer species feeds proportionally more on the resource that limits its own growth most. Stable coexistence is, however, also affected by the form of resource-dependent growth isoclines, which represent combinations of resource densities that lead to equal population growth of consumers. It is shown that ontogenetic niche shifts per se affect the form of resource-dependent growth isoclines, which in turn may lead to coexistence through niche partitioning. The chapter also discusses how predation may promote the performance of a species undergoing ontogenetic niche shifts even in the case where it is both the inferior competitor and the preferred prey of the predator.

Keywords:   ontogenetic niche shifts, interspecific competition, ecology, ecological dynamics, predators, coexistence

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