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Cubo (Temuco)
versión On-line ISSN 0719-0646
Cubo vol.23 no.3 Temuco dic. 2021
http://dx.doi.org/10.4067/S0719-06462021000300343
Articles
Non-algebraic limit cycles in Holling type III zooplankton-phytoplankton models
1 Facultad de Ciencias Físico-Matemáticas, Universidad Michoacana, Edif. Alfa, Ciudad Universitaria, C.P. 58040, Morelia, Michoacán, México. homero.diaz@umich.mx
2 Instituto de Física y Matemáticas, Universidad Michoacana, Edif. C-3, Ciudad Universitaria, C.P. 58040, Morelia, Michoacán, México. osvaldo.osuna@umich.mx
We prove that for certain polynomial differential equations in the plane arising from predator-prey type III models with generalized rational functional response, any algebraic solution should be a rational function. As a consequence, limit cycles, which are unique for these dynamical systems, are necessarily trascendental ovals. We exemplify these findings by showing a numerical simulation within a system arising from zooplankton-phytoplankton dynamics.
Keywords and Phrases: Predator-prey models; functional-response: Puiseux series; Newton polygon, limit cycles; invariant algebraic curve
Probamos que para ciertas ecuaciones diferenciales polinomiales en el plano que aparecen a partir de modelos predador-presa de tipo III con respuesta funcional racional generalizada, toda solución algebraica debe ser una función racional. Como consecuencia, los ciclos límite, que son ´únicos para estos sistemas dinámicos, son necesariamente óvalos trascendentes. Ejemplificamos estos resultados mostrando una simulación numérica para un sistema que aparece en la dinámica de zooplancton-fitoplancton.
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Accepted: July 07, 2021; Received: January 08, 2021