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Feeding Thresholdfor Predators Stabilizes Predator-Prey Systems

Published online by Cambridge University Press:  27 November 2009

D. Bontje ,
B. W. Kooi ,
G. A.K. van Voorn  and
S.A.L.M Kooijman
D. Bontje*
Affiliation:
Department of Theoretical Biology, Vrije Universiteit, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands
B. W. Kooi
Affiliation:
Department of Theoretical Biology, Vrije Universiteit, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands
G. A.K. van Voorn
Affiliation:
Biometris, Wageningen Universiteit & Research, 6708PB Wageningen, The Netherlands
S.A.L.M Kooijman
Affiliation:
Department of Theoretical Biology, Vrije Universiteit, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands
*
daniel.bontje@falw.vu.nl
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Abstract

Since Rosenzweig showed the destabilisation of exploited ecosystems, the so called Paradox of enrichment, several mechanisms have been proposed to resolve this paradox. In this paper we will show that a feeding threshold in the functional response for predators feeding on a prey population stabilizes the system and that there exists a minimum threshold value above which the predator-prey system is unconditionally stable with respect to enrichment. Two models are analysed, the first being the classical Rosenzweig-MacArthur (RM) model with an adapted Holling type-II functional response to include a feeding threshold. This mathematical model can be studied using analytical tools, which gives insight into the mathematical properties of the two dimensional ode system and reveals underlying stabilisation mechanisms. The second model is a mass-balance (MB) model for a predator-prey-nutrient system with complete recycling of the nutrient in a closed environment. In this model a feeding threshold is also taken into account for the predator-prey trophic interaction. Numerical bifurcation analysis is performed on both models. Analysis results are compared between models and are discussed in relation to the analytical analysis of the classical RM model. Experimental data from the literature of a closed system with ciliates, algae and a limiting nutrient are used to estimate parameters for the MB model. This microbial system forms the bottom trophic levels of aquatic ecosystems and therefore a complete overview of its dynamics is essential for understanding aquatic ecosystem dynamics.

Keywords

algal-ciliate experimentsfeeding thresholdmass-balanceparadox of enrichmentstrong stability
Type
Research Article
Information
Mathematical Modelling of Natural Phenomena , Volume 4 , Issue 6: Ecology (Part 1) , 2009 , pp. 91 - 108
Copyright
© EDP Sciences, 2009

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