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Effects of network and dynamical model structure on species persistence in large model food webs

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Abstract

Four models of network structure are combined with models of bioenergetic dynamics to study the role of food web topology and nonlinear dynamics on species coexistence in complex ecological networks. Network models range from the highly structured niche model to loosely constrained energetically feasible random networks. Bioenergetic models differ in how they represent primary production, functional responses, and consumption by generalists. Network structure weakly influenced the ability of species to coexist. Species persistence is strongly affected by functional responses and generalists’ consumption rates but weakly affected by models and amounts of primary production. Despite these generalities, specific mechanisms that determine persistence under one dynamical regime, such as top-down control by consumers, may play an insignificant role under different dynamical conditions. Future research is needed to strengthen the weak empirical basis for various functional forms and parameter values that strongly influence whether species can coexist in complex food webs.

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Acknowledgments

I would like to thank Neo Martinez for many useful discussions and comments on an early version of this manuscript.

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  1. Microsoft Research, 7 J J Thomson Ave, Cambridge, CB3 0FB, UK

    Richard J. Williams

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  1. Richard J. Williams
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Correspondence to Richard J. Williams.

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Williams, R.J. Effects of network and dynamical model structure on species persistence in large model food webs. Theor Ecol 1, 141–151 (2008). https://doi.org/10.1007/s12080-008-0013-5

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