Boukarabila, Siham2020-02-242020-02-242019-06-17salle des thèsesMS-510-90-01https://dspace.univ-tlemcen.dz/handle/112/15422In this work, we study fractional reaction-diffusion systems, where we will show the existence and the globality of solutions using the method of upper-lower solution and other techniques for systems with control of mass, at last we will study a model of coral reefs where under some conditions the Turing instability will appear.frnonlocal operators, fractional reaction diffusion systems, fractional laplacian, upperlower method, Turing instability.opérateurs non-locaux, système de réaction-diffusion, laplacien fractionnaire, méthode de monotonie, instabilité de Turing.Thesis