Análisis de la dinámica de una comunidad planctónica mediante un modelo matemático
Abstract
Mathematical models of various degrees of complexity have been successfully used ¡ti the study of aquatic ecosystems, primarily for the exploration of community structure, not only as tools for revealing counterintuitive mechanisms and patterns, but also for orienting theoretical speculation and suggesting directions of field and lahoratory research. Here we are interested in the oceanic planktonic system dominated by the unicellular algae Phaeocystis spp. Our mathematical model includes nutrient. phytoplankton and zooplankton (grazers and predators) compartments and is constructed ¡ti modular form ¡ti orderto analyse the impact of differentfactors¡n the complex dynamics ofthe system. Simulation. results show the importance of size structure in the colonial Phaeocystis population, as well asthe impact the character of the functional response of microzooplankton to algal abundance and the timing of’ large grazers in the community have on nutrient consumption.The effects of colonial cleavage caused by shear and the inflow of nutrients caused by remineralization or discharge of rivers llave also been explored. The results of our simulations indicate that the system has a strong dependence on the balance hetween growth rates and removalratesin both Phaeocystis and microzooplankton populations, nutrients and predators playing the role of indirect controls.
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