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Article

The Stochastic Nature of Functional Responses

1
Theoretical and Computational Ecology, Center for Advanced Studies of Blanes (CEAB-CSIC), Spanish Council for Scientific Research, Acces Cala St. Francesc 14, E-17300 Blanes, Spain
2
Complex Systems Group, Department of Applied Mathematics, Universidad Politécnica de Madrid, Av. Juan de Herrera 6, E-28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Amos Maritan and Andrea Giometto
Entropy 2021, 23(5), 575; https://doi.org/10.3390/e23050575
Received: 10 April 2021 / Revised: 4 May 2021 / Accepted: 4 May 2021 / Published: 7 May 2021
(This article belongs to the Special Issue Statistical Physics of Living Systems)
Functional responses are non-linear functions commonly used to describe the variation in the rate of consumption of resources by a consumer. They have been widely used in both theoretical and empirical studies, but a comprehensive understanding of their parameters at different levels of description remains elusive. Here, by depicting consumers and resources as stochastic systems of interacting particles, we present a minimal set of reactions for consumer resource dynamics. We rigorously derived the corresponding system of ODEs, from which we obtained via asymptotic expansions classical 2D consumer-resource dynamics, characterized by different functional responses. We also derived functional responses by focusing on the subset of reactions describing only the feeding process. This involves fixing the total number of consumers and resources, which we call chemostatic conditions. By comparing these two ways of deriving functional responses, we showed that classical functional response parameters in effective 2D consumer-resource dynamics differ from the same parameters obtained by measuring (or deriving) functional responses for typical feeding experiments under chemostatic conditions, which points to potential errors in interpreting empirical data. We finally discuss possible generalizations of our models to systems with multiple consumers and more complex population structures, including spatial dynamics. Our stochastic approach builds on fundamental ecological processes and has natural connections to basic ecological theory. View Full-Text
Keywords: stochastic consumer-resource dynamics; Holling type II and type III functional responses; Beddington–DeAngelis functional response; system’s size expansion; feeding experiments stochastic consumer-resource dynamics; Holling type II and type III functional responses; Beddington–DeAngelis functional response; system’s size expansion; feeding experiments
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MDPI and ACS Style

Palamara, G.M.; Capitán, J.A.; Alonso, D. The Stochastic Nature of Functional Responses. Entropy 2021, 23, 575. https://doi.org/10.3390/e23050575

AMA Style

Palamara GM, Capitán JA, Alonso D. The Stochastic Nature of Functional Responses. Entropy. 2021; 23(5):575. https://doi.org/10.3390/e23050575

Chicago/Turabian Style

Palamara, Gian M., José A. Capitán, and David Alonso. 2021. "The Stochastic Nature of Functional Responses" Entropy 23, no. 5: 575. https://doi.org/10.3390/e23050575

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