Dynamics and coexistence in a system with intraguild mutualism |
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Affiliation: | 1. Laboratorio de Sistemas Dinamicos, Depto. de Física, FCEyN, Universidad de Buenos Aires, and IFIBA, Argentina;2. Instituto de Física Teórica, Universidade Estadual Paulista, São Paulo, Brazil;3. Department of Zoology, University of Cambridge, Cambridge, UK;4. Depto. de Biolog’a, Facultad de Ciencias y Tecnolog’a, Universidad de Carabobo, Venezuela;5. Department of Mathematics and Statistics, University of Ottawa, 585 King Edward Avenue, Ottawa, ON K1N 6N5, Canada;1. Instituto de Ciencias, Universidad Nacional de Gral. Sarmiento, Los Polvorines, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina;3. Centro de Simulación Computacional, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina;1. Instituto del Desarrollo Humano, Universidad Nacional de General Sarmiento, J.M. Gutiérrez 1150 (B1613GSX), Los Polvorines, Buenos Aires, Argentina;2. National Council of Science and Technology (CONICET), Argentina;3. Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutiérrez 1150 (B1613GSX), Los Polvorines, Buenos Aires, Argentina;1. IFIBA, CONICET, Ciudad Universitaria Pabellón 1, 1428 Buenos Aires, Argentina;2. Facultad de Ingeniería, Universidad Austral, Av. J. de Garay 125, 1063 Buenos Aires, Argentina |
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Abstract: | It is a tenet of ecological theory that two competing consumers cannot stably coexist on a single limiting resource in a homogeneous environment. Many mechanisms and processes have since been evoked and studied, empirically and theoretically, to explain species coexistence and the observed biological diversity. Facilitative interactions clearly have the potential to enhance coexistence. Yet, even though mutual facilitation between species of the same guild is widely documented empirically, the subject has received very little theoretical attention. Here, we study one form of intraguild mutualism in the simplest possibly community module of one resource and two consumers. We incorporate mutualism as enhanced consumption in the presence of the other consumers. We find that intraguild mutualism can (a) significantly enhance coexistence of consumers, (b) induce cyclic dynamics, and (c) give rise to a bi-stability (a ‘joint’ Allee effect) and potentially catastrophic collapse of both consumer species. |
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