Cuadro de texto: Excitability is a transient phenomenon, i.e. localized in time, and in common settings also in space since it leads to well defined travelling waves, etc. Chaotic scattering in open chaotic flows is also a transient phenomenon but, when combined with excitability, can lead to permanent patterns of important ecological implications. The reason is linked to the existence, for small enough stirring, of filament solutions, arising from the competition diffusion-growth ? contraction by the chaotic flow They are distinct from the standard fronts in excitable systems Fast stirring destroys the filaments and the phenomenon. At very slow stirring the filaments tend again to dissapear, but the behavior is complex and dependent on flow geometry and filament interactions. Cuadro de texto: SUMMARY

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