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Dynamics of a intraguild predation model with generalist or specialist predator

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Abstract

Intraguild predation (IGP) is a combination of competition and predation which is the most basic system in food webs that contains three species where two species that are involved in a predator/prey relationship are also competing for a shared resource or prey. We formulate two intraguild predation (IGP: resource, IG prey and IG predator) models: one has generalist predator while the other one has specialist predator. Both models have Holling-Type I functional response between resource-IG prey and resource-IG predator; Holling-Type III functional response between IG prey and IG predator. We provide sufficient conditions of the persistence and extinction of all possible scenarios for these two models, which give us a complete picture on their global dynamics. In addition, we show that both IGP models can have multiple interior equilibria under certain parameters range. These analytical results indicate that IGP model with generalist predator has “top down” regulation by comparing to IGP model with specialist predator. Our analysis and numerical simulations suggest that: (1) Both IGP models can have multiple attractors with complicated dynamical patterns; (2) Only IGP model with specialist predator can have both boundary attractor and interior attractor, i.e., whether the system has the extinction of one species or the coexistence of three species depending on initial conditions; (3) IGP model with generalist predator is prone to have coexistence of three species.

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Acknowledgments

The research of Y.K. is partially supported by Simons Collaboration Grants for Mathematicians (208902).

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Authors and Affiliations

  1. Applied Sciences and Mathematics, Arizona State University, Mesa, AZ, 85212, USA

    Yun Kang & Lauren Wedekin

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  1. Yun Kang
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  2. Lauren Wedekin
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Correspondence to Yun Kang.

Appendix

Appendix

1.1 The persistence and extinction results in terms of the original parameters

In this Appendix, we convert the persistence and extinction results of scaled models (4), (5) to the results of their original forms (2), (3). See Tables 7, 8, 9, 10.

Table 7 Specialist predator (2): local stability conditions for boundary equilibria (BE)
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Table 8 Generalist predator (3): local stability conditions for boundary equilibria (BE)
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Table 9 Persistence results of (2) and (3)
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Table 10 Extinction results of (2) and (3)
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Kang, Y., Wedekin, L. Dynamics of a intraguild predation model with generalist or specialist predator. J. Math. Biol. 67, 1227–1259 (2013). https://doi.org/10.1007/s00285-012-0584-z

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  • DOI: https://doi.org/10.1007/s00285-012-0584-z

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