A four days lasting fieldwork aiming to the understanding of the distribution of the organisms and habitat types in relation to environmental changes. Observation of the horizontal distribution of habitats and adaptations of organisms to environmental changes (marine habitats, coasts, salt marshes and meadows, water courses and riparian forests). The different organisms along an altitudinal-climatic gradient (from the sclerophyllous scrubs to the deciduous forests and the alpine and subalpine formations).